You can tell squash-vine borers are present when you see frass (excrement) on the outside of the stem. It looks a bit like sawdust.
Squash vine borers are fat white caterpillars with brown heads. When they tunnel inside stems to feed, it causes healthy-looking plants to suddenly wilt and eventually die.
In late spring or early summer, squash-vine borer moths lay their eggs on squash and pumpkin vines, usually near the base of the plant. Their presence doesn't become apparent until weeks later, when the eggs hatch and the larvae have tunneled into the vines. Squash vine borers may also target cucumber and melon vines. They are found in all areas east of the Rocky Mountains.
How to Remove a Squash-Vine Borer from Gardener's Supply on Vimeo.
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