Q & A

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Eric Vinje

Hi Melanie –

Bacillus thuringiensis var. kurstaki or Bt-k will work on Squash Vine Borers but it must be injected or sprayed into the stem holes. In fact, studies have shown that Bt — an organic insecticide — was just as effective as chemical treatments. Here’s a link that should help:


Keep in mind that Bt is not approved by the EPA for vine borer control and will not show up on the product label.

Good luck!