Following up on our March
post about wasps and tree galls, Plateau biologist Shane Kiefer recently happened upon of the heaviest wasp gall infestations he has ever seen. The galls, seen in the photo below, were on a white shin oak stand in Kerr/Kimble County west of Harper.
According to
Agrilife Extension most gall forming insects are not harmful to the host tree (with the exception of possibly reducing yield when a heavy infestation is present in some crop trees such as pecans). Most gall forming insects prefer a particular type or species of host plant, so the insects that formed these oak galls would not be likely to infect other tree species in the area.
Once the galls form, pesticides will not work so in order to prevent them, you would have to treat when the adults are laying eggs. Because they are not considered harmful to the tree, this is not recommended. In addition, use of pesticides might also kill insects that prey on the gall forming insects and their larvae, thus reducing natural biological controls on them.
For more on galls, visit the
TPWD website.
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Wasp gall infestation. |
Labels: tree galls, wasp galls