Monday, May 14, 2018

Insects today: grape tumid gall and eightspotted forester

Hello everyone,

Today I came upon an adult eight-spotted forester, shown here:

Larvae will feed on grape foliage, but are seldom in high enough numbers to warrant treatment.  But the larvae are conspicuous (and rather pretty!) and may get your attention.  See the following link for more information:

Today I received a question on the use of Movento for grape tumid gall.  GTG is a cecidomyiid, a tiny fly resembling a mosquito in the adult stage (but non-biting!).  Ovipositing females insert eggs into a range of grape tissues, which give rise to reddish galls on petioles, shoots, rachis, etc.  Normally numbers are low, but some varieties are sensitive, and control may be be needed.  There is no specific monitoring method for GTG adults - if needed (on sensitive varieties with a history of infestation), apply when first galls appear.  More information can be found in the linked page:

 More later,

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