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Hornworms
Rufus Isaacs, MSU Entomology
Home > Scouting guide> hornworms
Hornworms (sphingid larvae) are found feeding on leaves in vineyards. Larvae may be brown or green with spots on the sides of the body and a distinctive “horn” on the rear end. The larvae can grow to 5 inches (12 cm) long, and they feed voraciously during development. Because of this, hornworms are more of a concern in young vineyards with limited leaf area. Larger vines can usually tolerate some leaf area loss from their feeding.
Hornworm Hornworm
The coloration of hornworms makes them hard to see, so feeding damage and droppings are usually the first sign of their presence.

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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program in collaboration with MSU Extension and the Michigan Agricultural Experiment Station. Partially support from NC-IPM Center.

Updated 12/20/07 Contact: E. Haney
     
Michigan Agricultural Experiment Station Michigan State University Extension