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Grape leaf green worm #871628

Asked June 04, 2024, 10:32 PM EDT

Noticed curled young grape leaf. Found several on an aged vine. A small green worm inside the leaf. Feeds on the leaf not the veins. What is it?

Fillmore County Minnesota

Expert Response

Hi Monica,

My best guess is that this is the larvae of the grape plume moth. They are not usually a serious threat to grapes or vineyards.

Here's some more information:

https://fruit.wisc.edu/2022/05/18/grape-plume-moth-2/

This website has photos of the developing insect, and at one point the caterpillar resembles the photo you sent.

https://www.prairiehaven.com/?page_id=54468

I hope this helps! Thanks.

MJ Replied June 05, 2024, 11:02 PM EDT

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This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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