This might be spider mites, it's hard to tell. The webbing is typical for them. If it were caterpillars, the leaves would be eaten and you would eventually see the caterpillar itself. Dry conditions favor spider mites. The soil in your pic looks very dry. What is your watering schedule?
To check to see if it is mites, hold a sheet of white paper underneath a leaf and tap the leaf onto the paper. If you see dark specks moving around, it's probably mites. These are arachnids, not true insects. Hard to get rid of, but I'm thinking Neem oil should work. Before you apply anything I would wait for some of our experts to answer this post to confirm this diagnosis and treatment.