Butternut - Juglans cinerea

  The Butternut - Juglans cinerea, is a medium to large sized deciduous tree that can reach heights upwards of 75 feet in ideal growth conditions.  It is sometimes also referred to as the White Walnut and is best recognized because of it's combination of long pinnate leaves with multiple leaflets and sticky 4-angled fruit husk.  It is native to the woodlands, floodplains, river terraces, and rocky slopes of the Eastern United States.  Found from New Brunswick, West through Minnesota in the North continuing South to South Carolina, Georgia, Northern Alabama, Northern Mississippi and Arkansas.  It is sometimes confused with the Black Walnut (Juglans nigra) but the fruit husks are greatly different as one has ridges and the other lacks ridges and angles all together.  This species is considered to be at risk as the Butternut Canker a fungal disease caused by Sirococcus clavigignenti-juglans-dacearun, has wiped out large populations throughout the native growth range.  

The bark of the Butternut is a light grey or brown, thick and deeply furrowed. The Leaves are alternate and pinnately compound with 11-17 leaflets one of which is a terminal leaflet. Each leaflet is 5-11 cm long and about 6 cm wide, narrow and ovate in shape with a tapering point at the end. The upper portions of each leaflet is a yellow green color while the lower is a paler in color, hairy and often sticky to the touch. In the fall the color of the leaves changes to a bright yellow or yellow-brown. The edible fruit is a brown ellipsoid or ovid drupe (nut) that is 5-8 cm long with a thick husk, it is sticky to the touch and mostly 4 sided. The kernel of the fruit is oily and matures in late Summer or Early Fall. The male flower of the Butternut are cylindrical, hairy and a green-yellow and occur as catkins that are 6-14 cm long, the female flowers occur as spikes of 4-7 flowers at the branch tips. The sweet sap of the Butternut is also edible and can be tapped during the Spring season. Butternut sap can be used as a refreshing drink, or boiled down to a syrup or sugar. The wood of the Butternut is coarse grained, soft, and very attractive, it weighs about 25 lb per cubic foot and is not as valuable a crop as the Black Walnut (J. nigra), but can also be used indoors for furniture, doors or trim.

Image Citation (Flowers):Steven Katovich, USDA Forest Service, Bugwood.org

The Butternut is recommend for hardiness zones and would make a lovely shade tree and nut producer in your landscape. Butternuts are the easiest of the native tree nuts to harvest and process though they are messy so be prepared for that when and if you decide to plant one in your yard. They are truly remarkable, in the sense that the nuts can remain fresh and edible for more than 25 years if the un cracked nuts are kept dry. Take care when trying to harvest the fruits/nuts as Butternut and Walnut husks emit a dye that will turn your skin and clothes brown. All trees in the Juglans family (this includes Butternut and Walnuts) generate a chemical from their root systems that will seep into the surrounding soil, the toxin, called juglone, prevents the growth of some species of plants. The most notable plants that can not tolerate juglone in their surrounding soils are rhododendrons, azaleas and crops such as potatoes and tomatoes.

Image Citation (Single Nut): Bill Cook, Michigan State University, Bugwood.org

Butternut products have been used for generations for medicinal purposes.  The Native Americans used the Butternut as a laxative and/or tonic to remedy arthritic or rheumatic conditions, headaches, dysentery, constipation and treat wounds.  Modern medicine still recognizes Butternut as a remedy for chronic constipation as it helps gently produce bowel movements.  The inner bark is one of the few laxatives that are considered safe for use during pregnancy.  Butternut products have also been found to lower cholesterol and promote healthy liver function by improving the clearance of waste from the organ.  

Image Citation (Butternut): Paul Wray, Iowa State University, Bugwood.org

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American Plum - Prunus americana

 American Plum - Prunus americana is best recognized by the combination of flaking scaly bark, sharply toothed leaf margins and red or yellow fruit.  It is a deciduous shrub or small tree that is capable of reaching heights of around 25 feet.  Generally it grows in an erect form with a single trunk, the young shoots are often thorn tipped.  

Image Citation: David Stephens, Bugwood.org

The bark is smooth and reddish brown with horizontal lenticels that becomes tan, buff or grey with age.  The leaves are alternate, simple, elliptical, and oblong with a rounded base.  They are green in color with a hairless upper and lower surfaces, and blades that are 4-12 cm long.  The flower is generally 20-25 mm in diameter with 5 petals.  Generally the flowers are white in color and may become pink with age, they appear in Mid Spring to Early Summer.  The fruit is a rounded or ellipsoid, red, orange, or yellow drupe.  The fruit appears in late summer and is often glaucous with a white waxy blush on the surface.  

Image Citation: Paul Wray, Iowa State University, Bugwood.org

The American Plum is native throughout the Eastern United States and continuing West through the Rocky Mountain region.  It prefers rich, moist, loamy soils, open woods, woodland margins, fence line and stream banks.  American Plum is sometimes considered to be thicket forming in woodland areas, though it is believed these thickets are formed by seedlings rather than root suckers.  American Plum can be found at most nurseries in the native region.  Currently there are over 260 varieties that have been developed from the American Plum which greatly improve the reach of it's growth range.

  

Image Citation: T. Davis Sydnor, The Ohio State University, Bugwood.org

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What is the oozing, foul smelling liquid coming out of my tree’s trunk? (Enterobacter nimipressuralis)

 Question:  

What is the oozing, foul smelling liquid coming out of my tree’s trunk?

Image Citation (Photo 1): Joseph O'Brien, USDA Forest Service, Bugwood.org

Answer:

One of the main diagnoses of this would be Wet Wood -Enterobacter nimipressuralis -often called, Flux or Slime Flux. Flux is a slimy, oozy liquid, that more often then, not also has an offensive smell. It drips or “oozes” from tree trunks, crotches, cracks and branch crotches. It is most often seen on Oak, Elm, Birch, and Maple trees. This sap is more prevalent during Spring and Summer while the tree is actively growing. This sap/flux often attracts insects, contrary to many beliefs the insects are not the cause of the Flux they appear after the flux comes out.

Many different bacterial infections can lead to Flux. Most often these infections begin in the Heartwood or Sapwood of trees and are caused by soil inhabiting bacteria. Wet Wood causing bacteria can grow anaerobically (without oxygen) in internal tissue of wood. These infections on the inside of the trees structure lead to increased pressure on the vascular system. The pressure causes the excess fluid (sap/flux) to ooze out of any opening it can find, usually crotches, cracks in the bark, or even old wounds. When the flux/sap oozes out it leaves behind a White or Grey streak on the bark or branches or the tree.

Image Citation (Photo 2): Rebekah D. Wallace, University of Georgia, Bugwood.org

Flux/Wet Wood infected trees have internal wood that is wet but not necessarily decayed. The infected portions of the tree will also have a higher pH level then the rest of the tree. Wet Wood infection actually prevents decay from fungi. The spread of Wet Wood/Flux within a tree is limited by the trees natural defenses. Trees have a natural ability to heal themselves often times human interference can cause more harm then, good, this is very true with this type of infection!

There is no specific treatment for Wet Wood/Flux. It is important with any tree that is stressed to make sure you are properly watering (definitely not overwatering) and if necessary, fertilizing. Some recommend removing dead or loose bark in the area of the wound to help keep the area dry. Others suggest creating a drain to allow the flux to ooze onto the ground instead of the bark of the tree, this also helps keep the area dry. It is recommend to NOT prune healthy branches on an infected tree as open wounds can lead to the spread within the tree itself. Deep fertilizing injections can also create new wounds and lead to spreading of the infection. Wet Wood does usually spread into new wounds and injuries so be careful around infected trees even when weed-wacking or cutting your lawn to avoid new injury.

Example of a Drain - One recorded type of treatment 

Image Citation (Photo 3): Tom Hall, Georgia Forestry Commission, Bugwood.org

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Oakleaf Holly - Ilex x conal

 The Oakleaf Holly - Ilex x conal is most easily identified by its leaves that are similar in shape to an Oak tree.  Recommened for USDA Hardiness Zones 6-8, it can reach heights of 15-20 ft tall and 10-15 ft wide.  It prefers full sun and moist, well drained soil that is slightly acidic.  The foliage is Emerald Green in color but fades to a lighter coppery green during the winter.

(Oakleaf Holly) Photo Credit: Amy Gilliss - Arundel Tree Service - www.ArundelTreeService.com

As with most other Hollies, The Oakleaf Holly can serve well as a yard hedge, formally or informal, as a singular focal point or to anchor a corner. The Oakleaf Holly is one that I have in my own backyard (7) of them to be exact.  We planted ours around our deck to anchor the corners where the stairs meet the deck and then have one in a corner to hide our crawlspace access. Heavy pruning is not required on the Oakleaf Holly as it naturally maintains a somewhat pyramid form.  More pruning will be required if you are attempting to train this variety to grow into hedge form or have a "perfect" shape (less natural appearance).

(Foliage) Photo Credit: Amy Gilliss - Arundel Tree Service - www.ArundelTreeService.com

Oakleaf Holly can be found at most larger Nurseries within Hardiness Zones 6-8.  We found ours from a local nursery/grower near Dover, Delaware (balled and burlapped).  I have yet to see any available at the smaller garden centers or large chain stores in my area.

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Tent Caterpillars (Malacosoma) are a mid sized genus in the Moth (Lasiocampidae) family

  It is that time of year again where those mysterious little tents seem to form in our trees overnight.  Have you ever wondered what they are and what they are doing in there?

Tent Caterpillars (Malacosoma) are a mid sized genus in the Moth (Lasiocampidae) family.  There are species found in both North America and Eurasia.  There are thought to be 26 different species (some having many subspecies), 6 of which occur in North America.  They are considered by many to be pest as they have a nasty habit of defoliating trees.  Tent caterpillars are considered to be one of the most social of all caterpillars often developing together within the same tent system. They are not only social but most often very colorful and are easily recognized by their silk tents built within the branches of host trees.  Tent mates are often decided based on the foraging ability of each caterpillar.  The Eastern Tent Caterpillar is the most common of the genus.  Tent caterpillars hatch from their eggs in the early spring at the time the leaves of their host trees are just unfolding.

Image Citation: Robert L. Anderson, USDA Forest Service, Bugwood.org

Some species of Tent Caterpillar build one large tent that houses them throughout the larval stages, while others build a series of smaller tents that are abandoned sequentially throughout the stages.  Tent caterpillars establish their tents soon after they eclose. They always make their tents within the nodes and branches of trees in a location that catches the rays of the morning sun.  Positioning of each tent is very critical as the caterpillar must bask in the sun during the early morning hours to elevate their body temperatures.  If their body temperatures dip below 59 degrees farenheit their bodies are not able to perform the simply process of digestion.  Each tent is made up of layers of silk that are separated by gaps, each individual compartment temperature can vary noticeably.  The caterpillar can move between compartments to alter it's body temperature as needed. 

Image Citation: Lacy L. Hyche, Auburn University, Bugwood.org

Tent Caterpillars are foragers searching out food and feeding to the point of repletion, once it has reached that level it returns to it's tent.  Along the way each caterpillar leaves a trail for other tent mates to follow to a good food source.  The chemical trail left behind in often compared to that of the ant or termite.  Their development is greatly in tune with that of their host trees, once the leaves of the host tree reach maturity they are no longer to feed from them.  They feed multiple times a day based on the needs of that level of the larval development.  They often leave the tent in mass, and move together to feeding sites.  

Image Citation: Lacy L. Hyche, Auburn University, Bugwood.org

Caterpillars grow at a very rapid pace and complete their entire larval process in a short 6-8 week period.  Once they leave their tents they find a suitable location (often a protected area on the ground or a structure) to spin their cocoons.  About two weeks after spinning their cocoons they emerge as adults moths.  Shortly after this point the female moth excretes a pheromone attracting a male to her for the purpose of mating.  After mating the eggs are then placed around branches and covered with spumaline, this material prevents the eggs from drying and protects them from parasites.  Once the eggs are laid the female dies.  The cycle of a female moths adult life may only last a short 24 hours while a male can live for a week or more.  Within three weeks of egg laying, small larvae can be identified within each egg mass, these larvae will remain encased within their shells until the following Spring.

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Smoketree - Cotinus coggygria

 The Smoketree - Cotinus coggygria -  is a small deciduous tree and a native of the wooded hills above the Mediterranean.  Named for it's blooms of wispy filaments in either pink or cream that look like poofs of smoke radiating from the trees branches.   In some areas the tree is nicknamed the Mist Tree, Cloud Tree or even Jupiter's Beard.  It is a relatively low maintenance shrub/small tree classified as an ornamental.   With a max height of 10-15 ' tall and a spread of 12 ', the Smoketree grows at a medium rate of just 12-24 inches per year.

In addition to it's smoky filaments this tree also produces flowers from June to September that are not very noticeable they are yellow-pink to plain pink in color and are often hidden by the wispy hairlike filaments.  The leaves are small 1 1/4 to 4 inches long and a pretty blue green in color in season, changing yellow, purple and red in the fall.  When crushed the branches and leaves have an almost citrus smell often compared to an orange.

Image Citation:(1&2) The Dow Gardens Archive, Dow Gardens, Bugwood.org 

Introduced in the America's in the mid 1600's, this tree makes for an interesting addition to any home/commercial landscape and is recommended for hardiness zones 5-8.  It is not particular when it comes to soil types and can handle both wet soil and semi drought conditions with ease.  This variety has been naturalized in ranges North of the American Smoketree from Illinois, Ohio, Maryland on North through Ontario and Vermont.  It is cultivated in the South as a specimen tree and is often found more often then the American Smoketree in this application.

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Sweet Birch or Cherry Birch - Betula lenta

 The Sweet Birch or Cherry Birch (Betula lenta) is most easily recognized by the combination of fine and sharply toothed leaf margins, winter green scent, scales on the conelike fruit and dark brown almost black bark.  It is a deciduous tree that can reach heights up to 65 feet, but usually does not exceed 3.5 feet in diameter.  The tree grows in an upright form with a generally single eract straight trunk and a rounded crown.  The Sweet or Cherry Birch is native to the United States.  It prefers rich, moist soil, cool forest areas, mountain slopes, Appalachian hardwood forests.  It can be found naturally occuring from New York and Maine in the North to Northern Georgia, Alabama and Central Mississippi in the South.  It is not often confused with the closely related Yellow Birch as the bark is significantly different in not only color but texture as well (Yellow Birch has a yellowish exfolliating bark).

Image Citation: Rob Routledge, Sault College, Bugwood.org

The bark of the Sweet/Cherry Birch is a dark gray brown to brown black in color, it is smooth when young becoming furrowed with age.  The twigs exude a winter green aroma and taste when scraped or injured.  The leaves are alternate, simple, paperlike in texture, obvate and and heart shaped at the base.  The leaf margins are finely and sharply toothed.  The upper surface is a dark green while the lower surface is a more pale green.  The flowers occur in make and female catkins, the male are reddish brown and 7-10 cm long, while the female are pale green and 1.5-2.5 m long both occur in the late Spring.  The fruit is a winged samara born in a scaly erect egg shaped structure that matures in late Summer or early Fall.

               

                                                                            

Image Citation: Rob Routledge, Sault College, Bugwood.org

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What causes the row of holes in my trees? Meet the Yellow Bellied Sapsucker woodpecker

 

Image Citation:(?) Johnny N. Dell, Bugwood.org

Yellow-bellied Sapsucker, sounds almost like and insult if you have never heard of the migratory North Eastern Woodpecker with that very name.  The yellow bellied Sapsucker is the only woodpecker in the Eastern North America that is completely migratory. Few may remain locally during most winter in the southern most portions of the breeding range, most however head further South as far as Panama.  For the most part the females travel further south when migrating then the males.  With length between 7-8 inches and a wing span of 13 to 15 inches they are an average size woodpecker.  They are larger then a Downy Woodpecker, but smaller then a Hairy Woodpecker.

Image Citation: http://www.allaboutbirds.org/guide/Yellow-bellied_Sapsucker/lifehistory

These birds are known to favor many different species of trees in this area, leaving a tell tale evenly bored rows of holes in their wake.  They make two types of holes while they work.  The First is a rounded hole extending deep into the tree that they probe for sap and trapped insects. The Second is a more shallow and rectangular hole that must be maintained to keep sap flowing.  When new holes are made they are usually kept in the same row or pattern of rows as before.  The wells of sap created by the Sapsucker are also frequented by hummingbirds who take advantage of the free flowing sap.  The holes are most commonly found on Atlas Cedar, Hemlock, Red Maple, Yellow, Paper and Gray Birches.  It seems Birches and Maples are a favorite as they tend to be the most notably marked.  Extensive and repetitive pecking may cause cambium and bark injury and brank/trunk swelling.  Resulting Girdling may kill portions of the trees above the boring injury.  Removing nesting areas for the Sapsuckers, such as decaying Aspen and Birch trees may help limit their activity as they tend to nest near the areas they feed.

                                     Image Citation:(?) Randy Cyr, Greentree, Bugwood.org

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Araucaria (Araucarias)

  The Araucaria (Araucarias) is a genus of trees mostly native to the Southern Hemisphere and including only 19 species. Four of these species have become popular ornamental plantings here in the United States (mostly in warm Southern portions of the Eastern Seaboard, and along the Atlantic and Gulf coastal plains). The four species that are found here in the US are Monkey Puzzle - Araucaria araucana (Molina), Cook Pine - Araucaria columnaris, Norfolk Island Pine - Araucaria heterophylla and Bunya Pine - Araucaria bidwillii. The Araucaria is one of three genera that make up the larger Araucariaceae family.

Bunya Pine  -  Image Citation: Dennis Haugen, Bugwood.org

Norfolk Island Pine - Thomas Smiley, Bartlett Tree Experts, Bugwood.org

All of the trees making up the Araucaria genus are tall evergreens with single straight trunks covered in rough dark gray-brown bark that is horizontally ridged. The trunks are generally covered in uniform whorls of branches that emerge at almost perfect right angles. The branches are covered in very dense or tight triangular or needle shaped evergreen leaves. The evergreen leaves are multi-veined and arranged spirally on each twig, branch and sometimes even on the trunk itself. Pollen Cones are large, one of the largest of any conifer. Seed Cones are dense and heavy, quickly disintegrating before or soon after falling. The inner seeds from the seed cone are considered a tasty treat to many varieties of native wildlife.

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Sparkleberry - Vaccinium arboreum

 The The Sparkleberry - Vaccinium arboreum, is best recognized by the combination of reddish bark, bell shaped flowers and lustrous green leaves with a tiny point on the tip. It is an evergreen in most locations or late deciduous in colder climates. It grows in an upright fashion small bush or tree form. It is native to North America, dry sandy woodlands, thickets and clearings.  It is widespread on the East Coast of North America, found from Ontario in the North and Florida in the South, West through Kansas and Eastern Texas.  

Image Citation: Chris Evans, University of Illinois, Bugwood.org

The bark is reddish brown to molted gray in color that often peels in plates or sheets.  The leaves are alternate simply shaped and firm in texture, the upper surfaces are lustrous and dark green in color.   The flowers are white in color, usually around 4 mm long and cup shaped.  The flowers occur in the Spring Season.  The fruit is a black berry that is dry in texture and 5-9 mm in diameter occurring in late Summer to early Autumn.  

Image Citation:  David Stephens, Bugwood.org

Meet more trees and shrubs on our website www.ArundelTreeService.com  or follow our blog www.MeetATree.com, is best recognized by the combination of reddish bark, bell shaped flowers and lustrous green leaves with a tiny point on the tip. It is an evergreen in most locations or late deciduous in colder climates. It grows in an upright fashion small bush or tree form. It is native to North America, dry sandy woodlands, thickets and clearings.  It is widespread on the East Coast of North America, found from Ontario in the North and Florida in the South, West through Kansas and Eastern Texas.  

Image Citation: Chris Evans, University of Illinois, Bugwood.org

The bark is reddish brown to molted gray in color that often peels in plates or sheets.  The leaves are alternate simply shaped and firm in texture, the upper surfaces are lustrous and dark green in color.   The flowers are white in color, usually around 4 mm long and cup shaped.  The flowers occur in the Spring Season.  The fruit is a black berry that is dry in texture and 5-9 mm in diameter occurring in late Summer to early Autumn.  

Image Citation:  David Stephens, Bugwood.org

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Smoketree - Cotinus coggygria

 The Smoketree - Cotinus coggygria -  is a small deciduous tree and a native of the wooded hills above the Mediterranean.  Named for it's blooms of wispy filaments in either pink or cream that look like poofs of smoke radiating from the trees branches.   In some areas the tree is nicknamed the Mist Tree, Cloud Tree or even Jupiter's Beard.  It is a relatively low maintenance shrub/small tree classified as an ornamental.   With a max height of 10-15 ' tall and a spread of 12 ', the Smoketree grows at a medium rate of just 12-24 inches per year.

In addition to it's smoky filaments this tree also produces flowers from June to September that are not very noticeable they are yellow-pink to plain pink in color and are often hidden by the wispy hairlike filaments.  The leaves are small 1 1/4 to 4 inches long and a pretty blue green in color in season, changing yellow, purple and red in the fall.  When crushed the branches and leaves have an almost citrus smell often compared to an orange.

Image Citation:(1&2) The Dow Gardens Archive, Dow Gardens, Bugwood.org 

Introduced in the America's in the mid 1600's, this tree makes for an interesting addition to any home/commercial landscape and is recommended for hardiness zones 5-8.  It is not particular when it comes to soil types and can handle both wet soil and semi drought conditions with ease.  This variety has been naturalized in ranges North of the American Smoketree from Illinois, Ohio, Maryland on North through Ontario and Vermont.  It is cultivated in the South as a specimen tree and is often found more often then the American Smoketree in this application.

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Gilroy Gardens - Gilroy, California, home of the "Tree Circus".

  The "Tree Circus" originally opened in 1947, as a roadside attraction in Scott's Valley California.  Axel Erlandson a bean farmer who pruned, grafted and trained the trees into various shapes as a hobby to amuse himself and his family, went to his grave holding the secrets of his technique. Most of his work was performed behind screens to protect his secret methods from the potential spy!  Since his death in 1964 many have tried to recreate his work unsucessfully, so this method of privacy seems to have paid off.  Sadly now it seems this type of tree "training" talent may never be seen again.

Millionaire Michael Bonfante purchased the trees and transplanted them to his amusement park Gillroy Gardens in 1985, where you can still see them today.  In the winter of 1984 the trees were all carefully hand dug and boxed.  On November 10th 1985 they began their 80 mile journey to their new home a trip that required many permits and the help of 20 local/state agencies to pull off.  Gilroy Gardens is in Gilroy, California and is home to 24 trees from Axel Erlandson's orginal "Tree Circus".

Some of the trees on display are:

The Cage Trees-Crafted of 10 American Sycamore

The Arch-Crafted from 2 American Sycamore

The Basket Tree-Crafted from 6 American Sycamore (and the most intricate of all)

The Chain Link or 3-2-1 Tree-Crafted from a single American Sycamore

The Compound 8-Crafted from a single Box Elder

The Double Hearts-Crafted from what is recorded as a Red Maple (although the species of this tree is often questioned)

The Figure Y-Crafted from 1 Cork Oak

The Four Legged Giant-Carfted from 4 Amercian Sycamore

The Oil Well-Crafted from 4 Box Elders

The Picture Frame-Crafted from a single Cork Oak

The Revolving Door or Compound Square-Carfted from a single Box Elder

The Zig-Zag- Crafted from 1 American Sycamore

Some of the trees formerly on display have been moved to private areas of the park for extra care and attention due to decline.  Hopefully one day we will be able to see them come back on display!

Plan your visit : https://www.gilroygardens.org/things-to-do/circus-trees .

These landmarks are surely on my to do list!

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Sudden Oak Death - Phytophthora ramorum

 Sudden Oak Death (Phytophthora ramorum) - SOD (also known as Phytophthora canker disease), was originally identified in Germany and The Netherlands in the early 1990's on Rhododendrons .  Since being discovered in the United States, it has been confirmed in forests from California, Oregon, Washington and British Columbia.  The origin geographically of Phytophthora ramorum is unknown and before the early 1990's there were no reports in Europe or the United States.  The areas that do exist in Europe and the United States are believe to have been originally transported from other areas or even the original site of origin.  Phytophthora ramorum's very limited distribution related to the host's distribution suggests a more recent introduction versus a point of origin.  

Image Citation: Joseph O'Brien, USDA Forest Service, Bugwood.org

Two types of disease are caused by Phytophthora ramorum, the first being bark cankers and the second being foliar blights.  Bark cankers may eventually kill the host while foliar blights serve as a reservoir for the pathogen to remain within and be tranferred from the foliar host.  The list of hosts (and foliar hosts) seems to grow with each new report and now includes Coast and Canyon Live Oak, Tanoak, California Black Oak, Coast Redwood, Douglas Fir, Rhododendron, Bay Laurel, California Buckeye, Madrone, Bigleaf Maple, Oregon Myrtle, Toyon, Honeysuckle, Arrowwood, Camellia, Californis Hazelnut, Mountain Laurel, Valley Oak, Poison Oak and Grand Fir.  In lab testing it has been found that both Red and Pin Oaks are susceptible this opens up the potential for spread into the Eastern portions of the US as the Red Oak family is found in most of North America. In the field the White Oak family including the Valley, White and Blue Oaks have not been confirmed as hosts or even shown any symptoms- hopefully this means they are immune to Phytophthora ramorum or at least have a higher tolerance level.

Image Citation: Bruce Moltzan, USDA Forest Service, Bugwood.org

As with many diseases of woody plants the spread of Phytophthora ramorum most likely occurs from contact with foliar hosts, infected material, soil transfer and spreading by rainwater.  Windy, cool and moist conditions are also thought to aide in the spread of the pathogen by further dispersing the spores from their foliar hosts.  Transporting (for nursery sale, wholesale or production) of foliar hosts may also aide in the spread of this disease making it harder to control.  

The symptoms of Sudden Oak Death are easily identified by large cankers on the trunk or main stem, browning of the leaves or even death of the entire plant/tree.  Some infected trees also become host to Bark or Ambrosia Beetles, or Sapwood rotting fungus-these outside organisms may speed up or even contribute to the death of the host.  Foliar host infection os harder to identify and may not be noticed until it is to late.  With a foliar host you may notice deep gray or brown lesions on the leaf blades, vascular tissues, petiole, or stems of the host.

Learn more about Oak trees and their diseases/pests on our Website www.ArundelTreeService.com  or our blog  www.MeetaTree.com 

Gray Birch - Betula

  The Gray Birch - Betula populifolia Marshall, is most easily distinguished by it's triangular leaf with flattened base, elongated tip and doubly toothed margins.  It is a deciduous tree that reached heights of about 40 feet.  Generally growing in a multi trunk, curving or leaning fashion it makes for a beautiful focal point in both residential and commercial landscape settings.  

Image Citation: T. Davis Sydnor, The Ohio State University, Bugwood.org

The bark of the Gray Birch is red-brown when young, becoming a gray or chalky white when mature.  The bark is smooth and tight, not usually exfoliating like some other Birch (Betula) varieties.  The leaves are alternate, simply shaped, thin and pendulous.  The triangular leaves are often compared in size and shape to those of the Quaking Aspen.  Leaf color ranges from a lustrous green in the Spring to a yellow or yellow-orange in the Fall.  The flower appears in late Spring in the form of a cylindrical catkin.  The fruit is a winged samara with wings broader then the body, they are borne in a narrow, bluntly pointed, erect or drooping structure.

Image Citations (Bark & Leaves): T. Davis Sydnor, The Ohio State University, Bugwood.org

The Gray Birch is native to the North East and Mid Eastern portions of the United States and extreme South Eastern portions of Canada.  It can be found from North Carolina and Virginia in the South, Illinois and Indiana in the West, New Brunswick, Quebec and Ontario in the North.  It prefers moist, well drained, rocky or sandy forests, abandoned sites (fields, pastures) and can often be found on natural reforestation sites that have been burned, or cleared.  Hybrids of the Gray Birch and Mountain Paper Birch are often called Blue Birch .  

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Paw Paw (Asimina triloba)

 The Paw Paw (Asimina triloba) is a small deciduous fruit bearing tree that is native to North America.  They grow wild in much of the eastern and midwestern portions of the country, but not in the extreme North, West or South.   

Image Citation (Photos 1 & 2): Rob Routledge, Sault College, Bugwood.org 

The leaves are green in the growing season and an elongated oval shape ranging in size from 10-12 inches long.  In the fall the leaves change to a rusty yellow in color.  When crushed the leaves have a strong unique odor, often compared to that of a bell pepper.  The leaves contain toxic annonaceous acetogenins, making them impalitable to most insects. The one exception is the Zebra Swallowtail Butterfly.  

The flowers have 3 prominent triangular shaped green, brown or purple outer petals.  The flowers are insect pollinated, but fruit production is often limited by the small number of pollinators that are actually attracted to flowers very faint scent.  

Image Citation (Photo 3): Wendy VanDyk Evans, Bugwood.org

The fruit is a green-brown in color and a curved cylindrical shape - the shape of the fruit is very similar to a fat lima bean.  The trees produce an almost tropical fruit with vanilla or banana/mango flavors. When ripe, the fruit’s soft flesh is very creamy in texture. The large seeds are easy to remove, making the pawpaw an excellent pick for fresh eating.  The short shelf life makes it an uncommon find in most market areas.   Fresh fruits of the Paw Paw are generally eaten raw, either chilled or at room temperature. However, they can be kept only 2–3 days at room temperature, or about a week if refrigerated.  

Many animals and insects make use of the Paw Paw tree and it's fruit.  The flowers attract blowflies, carrion beetles, fruit flies, carrion flies and other beetle varieties.  The fruits of the Paw Paw are enjoyed by a variety of mammals, including raccoons, foxes, opossums, squirrels, and black bears. Larvae of the Zebra Swallowtail Butterfly, feed exclusively on young leaves of Paw Paw.  Chemicals in the Paw Paw leaves offer protection from predation throughout the butterfly's life remaining in their systems and making them unpalatable to predators.  Whitetail deer do not feed on the Paw Paw.

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Elderberries - Sambucus

 The Elderberries - Sambucus are a small genus made up of only 10 species of which only 2 are commonly found in North America the American Elderberry- Sambucus nigra and the Red Elderberry- Sambucus racemosa, a third Danewort/Dwarf Elderberry- Sambucus ebulus is reported to be naturalized in the Northeast portions of the United States. They are deciduous shrubs, small trees or herbs with very soft wood and conspicuous pith.

Image Citation: (Common Elderberry) Charles T. Bryson, USDA Agricultural Research Service, Bugwood.org

The leaves are opposite and compound usually pinnate but occasionally bi-pinnate. The leaflets are lanceolate or ovate with distinctly toothed margins. The flowers are small, white or cream in color and generally made up 3-5 petals and 5 stamens. When crushed the flowers produce a sweet yet rancid odor. The fruit is a fleshy round berry like drupe, red or black in color depending on the species, these berries generally occur in bunches.

Image Citation: (Elderberry Flowers)  Ohio State Weed Lab , The Ohio State University, Bugwood.org

The Elderberries are mostly found in moist to wet areas, roadsides, ditches, wetland and woodland margins at elevations ranging from 3-3000 m. It is a dominant under story species in riparian woodlands where it persists despite the competition from other species, it does not however grow well in closed story forests. American Elderberries are found from the central portion of the US (Wisconsin to Texas) all the way to the East Coast and as far North as Nova Scotia. The Red Elderberries are found in a more limited area on either coast of the US, from Alaska in the North and Northern California in the South on the Pacific Coast, Sporadically from Northern Idaho to Arizona and New Mexico in the central portion of the country, and from Wisconsin to Nova Scotia in the North East and West Virginia, Northern Virginia, Maryland and Delaware in the Mid-Atlantic/South.

Image Citation: (Red Elderberry) Gil Wojciech, Polish Forest Research Institute, Bugwood.org

American Elderberry is best distinguished by the black fruit, whereas the Red Elderberry has red fruit. Similar species include Box Elder and Ash, which have similar leaves however neither have fleshy fruits as the Elderberries do. The fleshy fruit is edible and has been used by various cultures including Native Americans, Spaniards, Cahuillas, French, Austrians, and Germans for many different purposes. The berries can be used to make wine, jams, jelly, syrup and pies. When dried they can be cooked down to form a sauce (sometimes called sauco by the Cahuillas) that does not require any type of sweetening. The flowers are sometimes added to batters, eaten raw, added to teas, or even fried for a sweet snack. The twigs can be used to tap Maple trees for Syrup collection, basket weaving, flute and clapper stick making, tinder and even homemade squirt guns (when hollowed out).

Image Citation: (Dwarf Elderberry) Jan Samanek, Phytosanitary Administration, Bugwood.org

Many Elderberries are planted for their ornamental value offering visual interest with both the flowers and the berries, others are planted for the wildlife value as they attract birds, small mammals, rodents, deer and butterflies. They are very a productive, adaptable and easy to establish species. Elderberries also are a very useful ground cover for stabilizing stream banks and other sites that are prone to erosion. Elderberries grow best from seed and are most often sown in the Fall season, cutting from this species are not very successful. This species is recommended for hardiness zones 3-8 and can be found at many nurseries for planting in your own garden.

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