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Extension > Garden > Diagnose a problem > What insect is this? > Garden Pests > Flies, moths, wasps,and other insects with obvious wings - 1/4 to 3/4 inch long > Squash vine borer

Rose aphid
Photo Credit: Jeff Hahn, Univ. of Minnesota Rose aphid
Photo Credit: Jeff Hahn, Univ. of Minnesota

Squash vine borer
Melittia cucurbitae
Size: ½ inch long

Where/When: Associated with vine crops, especially zucchini, winter squash, pumpkins, and less frequently cucumbers and melons. Adults are active from late June/ early July to early to mid August.

Significance: Larvae tunnel through the stems, causing the plants to wilt and often causing the entire plant to die.
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