Datana ministra

Walnut Cats on the Prowl

Walnut caterpillars are producing noticeable defoliation in southwest Ohio. The moth caterpillars feed in groups, or "colonies," of 10-30 individuals throughout their development which is why their defoliation is often focused on a single branch or a group of adjoining branches. However, it's also why multiple colonies can quickly defoliate small trees.
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Joe Boggs