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image of adult

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Kansas State University

Adults:
The adult squash vine borer has a wasp-like appearance with a wing span of about 1 1/4 inch (25-37 mm). The front wings are opaque, tinged with metallic green. The hind wings are transparent. The abdomen is ringed with orange and black. The hairy hind legs are a reddish-orange color.

Eggs:
Eggs are a flattened oval shape, brown in color and about 1/25 inch (1 mm) in length. They are laid on the stems of the host plants. The eggs hatch in 9-14 days.

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image of larva

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Kansas State University

Larvae:
The larvae have a grub-like appearance with a white body with a brown head. When full grown, the larvae are about 1 inch (25 mm) long.

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image of larva

by

Texas A & M University

Pupae:
Mature squash vine borer larvae pupate in mud-covered black silk cocoons in the soil. The pupae are brown and about 3/4 inch (19 mm) long.