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I've wondered that myself. I have the only cucurbits (that I know of) within a mile, but they manage to find my plants.
I use pesticides until the plants start putting on blossoms, then they are on their own (don't want to kill no bees). More than one year I have had to replant cucumbers in July. The beetles don't seem to be active late in the season, so my second plantings have done OK. Got lucky this year so far.
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