Cherry fruitworm

The cherry fruitworm, Grapholitha packardi, which bores into the fruit and feeds extensively below the surface, can be very damaging to blueberries. It causes injury within a few days of hatching. This pest overwinters as mature larvae in hibernating structures on the blueberry bushes, with larvae pupating in the spring. The adults appear in about a month (this varies by seasonal conditions). Adult moths mate and lay eggs on unripe fruit.

Pruning and burning the cut limbs helps control the cherry fruitworm, because the hibernating larvae are contained in these limbs. The cherry fruitworm is a lepidopteran pest, and organically approved control products include B.t. or the spinosad product Entrust.

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