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Virginia Forestry Association




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Mid-summer Defoliation of White Oak Trees Occurring in Northern Virginia Counties


Homeowners in six Northern Virginia counties have expressed concern to the Virginia Department of Forestry and Virginia Cooperative Extension about defoliated white oak trees. Forestry officials have conducted aerial and ground surveys and determined that, while this occurrence is fairly widespread, it is concentrated in and around the hills of western Fauquier County and adjacent Loudoun County. Portions of Prince William, Culpeper, Orange and Rappahannock counties are also affected.

The culprit appears to be a very tiny insect known as a gall wasp. There are many species of gall wasps, particularly those that affect oak trees. These ‘wasps’ do not sting, and are rarely ever noticed by the public. However, this type of insect injects eggs into plant tissue, which forms a swelling or ‘gall’ around the injection site. Inside a hollow space within the gall, the developing egg hatches into a larva, and ultimately emerges from the gall as an adult wasp, repeating the cycle one or more times each year depending on the species. Each species of gall wasp specializes on a particular host and plant part, and each species produces a unique gall. Thus, there are a wide variety of plant galls that differ in shape, size, color, texture and the part of the plant affected (leaves, twigs, buds, flowers, etc). While gall wasps are a normal component of every forest ecosystem, they are generally kept under control by other insects and are not typically abundant enough to cause serious damage to trees and shrubs. However, in rare instances they can become so abundant that their galls can cause noticeable damage.

VDOF Forest Health Specialist Dr. Chris Asaro said, “In this case, we are dealing with ‘jumping oak galls’ – also known as ‘oak button galls’ because of their button-like shape. These galls are quite small – about the size of a sesame seed – and are located on the underside of white oak leaves.  They are orange in color and dislodge easily from the leaves when brushed lightly. Each gall leaves a ‘pock-mark’ of dead cells at the point of attachment to the leaf. These dead spots on the leaves can sometimes be so abundant that they begin to run together, eventually enveloping and killing an entire leaf. Many trees have lost 50 percent or more of their foliage, and some trees have lost almost 100 percent.”

Outbreaks of this particular gall wasp are not very common, according to Dr. Asaro, but they have occurred before in this area. Typically, gall outbreaks are short-term in nature, and gall wasp populations soon crash on their own after a year or two due to natural predation by other insect species.

“While the current defoliation may seem alarming and sudden to many folks, the good news is that most trees will recover without too much long-term damage,” Asaro said. “While defoliation can be a significant stressor, a tree that is otherwise healthy will normally start to produce new leaves and survive, even when defoliation is near 100 percent.”

On the other hand, trees that experience severe defoliation for two or more years in a row are more likely to succumb, especially when exposed to other stressors. Many oaks across Virginia, especially older ones, often suffer from decline. Oak decline is a complex condition that can be due to multiple factors acting in concert.  These factors include site-related stressors, such as poor soil and mechanical damage to the roots or tree bole from mowing or other equipment or from recent construction and soil disturbance. Areas that have experienced severe drought over the past10 years also see elevated rates of oak decline; even if we aren’t experiencing drought conditions right now, drought impacts can often be seen years later after root disease sets in and slowly weakens trees. Weakened trees become more vulnerable to insects and diseases, which contribute to decline.

Northern Virginia Senior Area Forester Terry Lasher said, “Most people don’t notice tree decline because the initial symptoms can be subtle and occur internally or below-ground. Trees can appear to die ‘suddenly’ when they reach a critical point, but, in most cases, they were rotting from the inside for many years.”

Homeowners should not panic, though, if their trees look bad during the summer months due to brown leaves or defoliation. If the tree is otherwise healthy, it can withstand a lot of defoliation before any long-term health impacts set in.

Lasher said, “Even if an oak tree looks bad for the rest of the year, it’s best to wait until the following spring to see if it leafs out normally. This usually indicates the tree is doing well.”

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USDA Announces Inclusion of Wood Products and Other Materials in BioPreferred Program

The U.S. Department of Agriculture has issued a final rule eliminating the restrictions on including mature market wood products and other materials in the BioPreferred program. The action implements changes included in the 2014 Farm Bill.
"Every day, companies across the nation are expanding markets for agriculture and growing job opportunities in rural America," said Agriculture Secretary Tom Vilsack. "The inclusion of innovative wood products furthers our commitment to strengthening the biobased economy and ensures that the Federal government uses home American grown products whenever possible."
The final rule establishes a procedure to designate "intermediate ingredients" so products made from them can be included in the "preferred" Federal procurement process. That rule establishes procedures for designating "complex assemblies" that contain one or more components made from biobased ingredients.

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Northern Long Eared Bat Update

The U.S. Fish and Wildlife Service has proposed that the Northern Long Eared Bat be added to the list of endangered species and drafted interim planning guidance that could potentially shut down timber operations in huge swaths of the U.S from April to October.  Although it's called "Northern" the bat resides in 39 states, including western Virginia, so a listing and enforcement of these logging restrictions would impact forest fiber production over much of the country and the state. 

Directors of the Wisconsin, Indiana, Michigan and Minnesota Departments of Natural Resources have sent a joint letter protesting the fact that the USFWS drafted the planning guidance without consulting state or regional offices.  Congressional delegation letters are also being sent, with the Oklahoma and Ohio delegations weighing in to oppose the listing and other delegations lining up to do the same. 

A notice for a six-month extension for the final listing determination on the northern long-eared bat was published in the Federal Register on June 30, 2014.  The comment period on the proposal to list the bat as endangered was also reopened. the 60-day comment period ends on August 29, 2014.  A final decision on listing the northern long-eared bat will be made no later than April 2, 2015.

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