April 19, 2018

Grape Tumid Gallmaker

Suzanne Wold-Burkness, Department of Entomology, University of Minnesota

Numerous species of gall midges attack grape.  The main species is the grape tumid gallmaker, Janetiella brevicauda (Diptera: Cecidomyiidae), formerly thought to be a complex of several species.  The adult midges oviposit within the unfolding bud or shoot tip.  Larvae hatch and enter the vine tissue.  As the larvae feed, a gall forms around them.  Fully developed larvae exit the gall and drop to the soil where they pupate. Midges (adults) produce from one to three generations per year.  No practical control measure for grape tumid gallmakers is known.


Cranshaw, W.S.  Garden Insects of North America.  2004.  Princeton University Press.  pp. 672.

Clark, L. and T. Dennehy.  1989.  Grape Tumid Gallmaker.  New York State IPM Program.  Cornell University fact sheet.  http://www.nysipm.cornell.edu/factsheets/grapes/pests/gtg/gtg.asp.


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