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Potato Harvest Timing and Grub Control in Washington

Dig potatoes when foliage dies back—roots stop growing. White grubs found now: no treatment needed at harvest. Future control: Bt (Dipel/MVP) dust for caterpillars/hornworms. Non-toxic, effective.

Harvest & Prep

Foliage dead = dig now.
Grubs won't damage stored tubers.
Next year: Bt at egg hatch.
Rotate crops.

Clean harvest, plan ahead.

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