If you see a tomato hornworm or other caterpillar covered with small white or light brown
ovals, leave it be. The caterpillar is doomed! A beneficial wasp — probably a braconid,
chalcid, or ichneumon wasp — has laid eggs on the caterpillar's body. When the eggs hatch, the
larvae will devour the caterpillar. As a bonus, you'll have even more beneficial wasps in the
garden next year to keep the caterpillars under control.