Grape tumid gallmakers, Family: Cecidomyiidae

This is modified from the chapter:

Pfeiffer, D. G.  2008.  Major insect and mite pests of grapes. p. 241-261, 307-311. In: T. K. Wolf (ed.) Wine Grape Production Guide for Eastern North America.  Natural Resource, Agriculture, and Engineering Service, Cornell.

Galls of various shapes occur on grape as a result of attack by small gall midges. Galls occur on leaves, tendrils, blossom buds and in the rachis, and can occasionally cause considerable injury. Galls on the leaf blade may occur in clusters, and contain a single orange maggot each.  Other galls, in the rachis for example, may contain a network of tunnels.  Numerous species of gall midges attack grape. The main species is the grape tumid gallmaker, Janetiella brevicauda, formerly called tomato gall, and also formerly thought to be a complex of several species. Infestations in the rachis are more damaging than foliar, petiole or tendril galls, because they can lead to failure of clusters to to develop.  Some varieties (e.g. Traminette, Niagara) are more sensitive than others.  In most situations, pesticide application is not required because there is little economic impact from low to moderate levels of galls.  In blocks with a history of high populations, however, Movento (spirotetramat) may be used, timed to the first appearance of galls.  This is included under the Pre-bloom section in the Virginia Tech Pest Management Guide for Commercial Vineyards.  Removing the galls by hand and destroying them would inhibit future populations.

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