Trifecta Crop Control was specifically designed to address and mitigate issues with fungal species and parasitic mite species. That said we have heard several anecdotes about Trifecta working well as a deterrent for caterpillars. Specifically, we were told about a situation where a farmer sprayed the perimeter of his field, from the ground up into the foliage of trees with Crop Control using a cold fogger spraying apparatus. Apparently all of his neighbors had huge issues with caterpillars, and he didn’t. That said, there are many caterpillar species, and it wasn’t what Crop Control was designed for. We can’t make any promises or guarantees, but we believe that it would be reasonable to assume a certain degree of repellent effect.