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February 17, 2016 at 3:11 pm #188225

Eric Vinje
Keymaster

Hello Cecilia,

Unfortunately trichogramma wasps will not parasitize squash vine borer. There are many insecticides that you can buy to try and eliminate the adults and their eggs, however, they only lay eggs for such a short duration it is hard to be effective.

One method to limit infection is to plant vulnerable plants far apart. Other gardeners cover their squash with shade cloth. This is an effective method, however, cover each plant separately. The cloth may be removed after the danger of infection has passed.

Some gardeners just inspect their plants often looking for the eggs, since window for egg-laying is so short.

Good luck!

http://showerfreshgarden.blogspot.com/2010/05/squash-vine-borer-eggs.html