fall webworm, walnut caterpillars have arrived right on schedule--late June. Today, we found a couple of newly hatched walnut caterpillar colonies (photo at right). Newly hatched larvae are quite small and olive green in color.
normal. And second, not all the eggs hatched indicating possible parasitition by the wasp, Trichogramma minutum. The laying of large egg masses is often a precursor for an outbreak of walnut caterpillars. The fact that less than 10% of the eggs were parasitized means that wasp parasites were not numerous enough to keep walnut caterpillar in check. Everything I saw today, points to a walnut caterpillar outbreak, at least in and around the Pecan Field.