Desmia funeralis or possibly, Desmia maculalis
A significant white spot on the head is, according to the Covell Field Guide, a characteristic mark of Desmia maculalis. Brian Scholtens informs me that this is not a reliable character and that two species (D. maculalis and D. funeralis) cannot be distinguished in typical dorsal view photos. It would be necessary to see mouth parts at high magnification or examine genitalia to make specific determinations. It is best to consider photos of these species as representing a species group.
The caterpillar host plants are evening primrose, grapes and redbud. As their name suggests, as larvae, they roll themselves in leaves and nibble on the inner curl.
The grape leafroller is a minor pest to the wine industry. Severe outbreaks can happen when their natural predators are low. Many times the leafroller attacks after harvest, when the farmers have stopped treating for pests. Unfortunately, the defoliation may cause a reduced crop size next season. 😯
Honestly, had I had this information available to me when I had it on my finger, this post may have ended in a funeralis…
© Ilex – Midwestern Plant Girl