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We tried. We really did. Being vigilant about searching for and destroying eggs, watching for any signs of damage — we did it all. But it still didn’t work. The damn squash vine borer got our zucchini and yellow squash.

This shows squash vine borer damage on our zucchini plant. The frass is a sign of an infestation.

This shows squash vine borer damage on our zucchini plant. The frass is a sign of an infestation.

I noticed the tell-tale signs of frass a couple weeks ago. It looks a lot like sawdust and it meant our summer squash plants would die soon. That’s when I sprung into action and tried the Bt to stop the grubby invaders.

I’ve mentioned this before but for those who don’t know, Bt is a natural bacteria that messes with the borer’s digestion when they eat it. So as soon as we noticed the frass, I was armed with my garden syringe and a jug of Bt (it has to be mixed with water), stabbing away at the stems and injecting the solution.

This was the first time I tried using the Bt solution, and you know what? It worked like a charm. The zucchini plant has rebounded (for the most part), and there are even a couple growing again!

Even if we don’t get any more, I’ll at least count this as a success.

Related: How to control SVB

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We came home from a camping trip two weekends ago and were excited to see how our garden was doing. Everything looked great until we spotted it – the adult version of the squash vine borer. There it was, just sitting on the zucchini leaf minding its own business.

The adult SVB. From whatsthatbug.com

The adult SVB. Photo from http://www.whatsthatbug.com

These have been a terror in our garden for the past three years, destroying our squash plants. Ever since the first year, when our plants were perfectly healthy then dead within days, we’ve been watching for this. I thought we were in the clear this year, but I was wrong.

In a weird way, I’m glad we saw it. I wasn’t as diligent about checking for any signs of the squash vine borer because everything was healthy and doing well — no yellow leaves, no wilting.

I think our beneficial nematodes really helped because they killed most of the cocoons that might have overwintered. But, seeing this adult reminded us that we’re not in the clear, and we still need a plan of attack.

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