Answer: Your cucumbers were most likely attacked by the pickleworm. The pickleworm larva is yellow-green with numerous black spots. They bore into the side of fruits before the rind hardens and tunnel inside leaving masses of soft excrement.The fruit then rots or sours.
Sprays containing the biological control Bt (Bacillus thuringiensis, a bacterium that attacks only caterpillars), applied on a 5 to 7 day schedule beginning when fruits start reaching a couple of inches long, are an organic choice for controlling pickleworm.
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