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Oak Gall Wasps



P_oakglwsp

Oak Gall Wasps

Usually appear in

All Year


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Caused By:-     Various Wasps.

Description

Oak hedgehog gall on White Oak (Quercus alba) leaf, caused by a Cynipid gall wasp. There are about 1000 different species of gall forming wasps that inhabit Oak(Quercus species). Some forming the galls known as Oak apple, Oak Marble gall, Knopper gall, Rose bedeguar gall, horned oak gall wasp, and the Common Spangle gall. The larvae of most gall wasps develop in characteristic plant galls they induce themselves, by secreting various chemicals into the Oak and most wasp larvae lives inside the galls. Once a gall begins to develop, it is almost impossible to stop or reverse its development of the galls even if the larvae is killed. Galls are abnormal plant growth or swellings comprised of plant tissue. Galls are usually found on foliage or twigs and sometimes on the roots. The life cycles of the various gall-forming wasps are highly variable and sometimes very complex. Some wasps has a two cycle generation where one forms one type of galls and the next generation forms another type of galls. Some needs two different Oaks to complete its life cycle. Picture from Wikimedia Commons.
See also these other Galls ACER GALL MITES, ACORN GALL MITES, AZELAE GALL, BEECH GALL MIDGE, BLACKCURRANT GALL MIDGE, BROOM GALL MIDGE, CAMELLIA GALL, CROWN GALL, EUONOMUS GALL, FELT GALL MITES, FORSYTHIA GALL, GALLS, GALL WASP, GLEDITSIA POD GALL MIDGE, HEMEROCALLIS GALL MIDGE, HAWTHORN BUTTON TOP GALL MIDGE, KNOPPER GALL OF ACORNS, LEAFY GALL, LIME NAIL GALL MITE, PEAR LEAF BLISTER MITE, PINAPPLE GALL ALDELGID, PLUM GALL MIDGE, ROBINS PINCUSHION, TURNIP GALL WEEVIL, VINE ERINOSE GALL MITE, VIOLET GALL MIDGE, WILLOW BEAN GALL SAWFLY.


Control

In general, most leaf galls on do not affect the health of the host tree. A few can cause leaves to drop prematurely, or distort them so that photosynthesis is interrupted.
Galls generally are aesthetically objectionable on an aesthetical level, but in general they can be ignored or be picked off by hand.
Chemical control is seldom suggested for management of leaf galls on oak, but good sanitation will help to reduce the incidence of gall wasps as some fallen leaves and galls may harbour various life stages of the gall-producing pests. Therefore, it may be useful to collect and destroy all infested leaves and galls.
Some of these pests overwinter in twigs and branches of oak.
Where such woody galls are detected, prune and destroy the infested plant material when the galls are small and have just started to develop.


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