Dry pellets of frass (excrement) of tomato hornworm, Manduca quinquemaculata, on the ground beneath a caterpillar-infested plant.

Dry pellets of frass (excrement) of tomato hornworm on the ground beneath a caterpillar-infested plant.; Colorado Credit: Whitney Cranshaw, Colorado State University, Bugwood.org<br />Licensed under a <a href=Creative Commons Attribution 3.0 License" />
Dry pellets of frass (excrement) of tomato hornworm, Manduca quinquemaculata, on the ground beneath a caterpillar-infested plant. Credit: Whitney Cranshaw, Colorado State University, Bugwood.org
Licensed under a Creative Commons Attribution 3.0 License