Squash Vine Borers: Identification and Prevention

Sudden wilting starting at the base of squash, pumpkin, or delicata vines—often with orange, crumbly frass—is the hallmark of squash vine borers. These larvae bore into stems, cutting off water flow and eventually killing the plant. Once inside, little can save the vine, though existing fruit may still ripen.

Preventive Strategies for Next Season

• Row covers (Reemay): Cover seedlings until flowering to block egg-laying moths. Remove for pollination.
• Stem wrapping: Wrap the base of vines with aluminum foil once blooming starts to physically barrier borers.

Combining both methods—covers early, foil later—offers the best protection for future crops.