Yes, SVB are impossible to control organically. What I do is succession planting and I get plenty of squash.
I plant zucchini outdoors and when they start flowering , I plant a couple more seeds, then in a few weeks I plant a couple more seeds. I absolutely KNOW that they will get infected but it takes several weeks after infection for the plant to die so I get squash before the plant succumbs but by then I have another couple of younger plants already growing so they give me squash after the first plants die.
I tried growing Perfect Pick outdoors with row covers one year but the plants got really big and I guess that the SVB moth found gaps in the covering and laid her eggs because the plants got infected and died. The squash that I did get were OK though.
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