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Observation notes: About 80 degree, evening. calm, been hot for several weeks, no rain in a while. I found this on a young grape plant. It had eaten several leaves. There were mostly grape plants but a few flowers and near strawberry and sweet potato plants on other side of wire fence. It seems to be a bit darker than the photo, more black than brown. It reminds me of a tomato horn worm, but no horn and not green. and not on tomatoes which I have about 40 plants, and not worms on.