April 19, 2018

Grape Cane Gallmaker

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

The grape cane gallmaker, Ampeloglypter sesostris (Coleoptera: Curculionidae), is a very minor pest of grapes in the eastern U.S. The reddish-brown adult weevils are approximately 0.3 cm long and have a distinctive curved snout. The grape cane gallmaker overwinters in the adult stage in debris on the ground. Egg-laying begins in May or June when shoots are from 25 to 50 cm long. In mid- summer adults begin to emerge from infested canes. Adult emergence continues through September. The gall-like swelling on the cane is caused by oviposition. Galls are usually twice as thick as the cane and 2 to 4 cm long. They are found just above the nodes and are of uniform shape except for a deep longitudinal scar on the side of the gall where the female made the egg cavity. Exit holes may also be found next to the scar.

References

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

Riedl, H. and E. F. Taschenberg. 1984. New York State IPM Program. Cornell University fact sheet. http://www.nysipm.cornell.edu/factsheets/grapes/pests/gcgm/gcgm.asp.

 

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