Jumping Oak Gall is a fancy way of saying, ‘a wasp is laying eggs and using the leaf as a host’. RETURN TO OTHER VIDEOS
Leaf skeletonizers feed on the lower-leaf surfaces of oaks. The result is a translucent, lacy appearance to the leaves. If there is a large population it can cause leaf-browning and premature defoliation. When a tree’s leaves are rendered useless, it weakens the tree. This makes it increasingly susceptible to disease. TreeCrews.com 770-479-9611
The jumping oak gall is caused by a small wasp that produces two generations per year. The initial generation comes out in the spring. These are all females. They will lay eggs on new leaves. The eggs hatch into male and female wasps, which mate and start the next generation. The discoloration is a result of the gall formed by the second group of eggs that hatch. When the galls fall to the ground they will actually jump to help lodge them in the upper layer of decomposed material. Here it will survive the winter and emerge as females the next spring. The larvae inside the gall will sharply hit the side of the gall (cells from the leaf that form a shell) causing it to jump like the Mexican Jumping Bean.
When the gall makes a spot, it causes the leaf to discolor. If enough galls form, it can make the leaf look brown in color. Some may also form on the petiole, which is the stalk of the leaf attaching the blade to the stem, and can cause the leaf to turn brown.
What can happen to the oaks? If the tree is already weak, it can die. It does not kill every tree. Valuable trees in your yard that you want to insure will remain should be watered during dry periods. Fertilization will help trees endure some damage. Properly timed treatments are also important. Before considering a treatment speak to a “good” certified arborist.
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