Ask a Question forum: Insect feeding on grapevine?

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Aug 14, 2016 9:05 AM CST
So, the past few days, I've noticed these small caterpillar like insects on my grape plant leaves. The insect is always on the underside of the leaf on one of the veins. It's very small, about a half an inch long, and a pale green color. The caterpillar insect also has a black/brown stem thing coming out of the head? Also, around the same time as these insects showing up, there have been shiny trails on the topside of the leaf near the veins. Can you tell me about this insect if you know what it is? I think it may be feeding on the plant...
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Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
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Aug 14, 2016 9:38 AM CST
I can't see the head well enough to see if it matches but does it resemble the younger one-eyed sphynx moth caterpillar pictured here?

It's not listed to occur on grape but there are other sphynx moths that are. I can't find an early instar picture of the others but it's possible they may be similar.

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