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Catalpa hornworms have defoliated one catalpa tree and partially defoliated another here in western North Carolina. You can see the cocoons from a parasitoid wasp that inserted one egg with multiple embryos into the caterpillar. The egg produced multiple larvae. These endoparasites then fed inside the caterpillar, matured and emerged through the back. They then immediately spun their silken cocoons.
Locust leafminer adults are active now on black locust. The larvae develop within a blotch leaf mine while the adult leaf beetles feed on the leaf surface. The trees are able to withstand yearly feeding damage and still grow well. It is only a pest of black locust.
