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Over the winter my potted plants that have been sheltering undercover in the polytunnel seem to have become infested with vine weevil grubs - even my nectarine tree has the little white creatures in the soil. I can't water the pots with Provado as it says it can't be used on edible plants. Has anyone used the nematode approach and does it work?

Cabbage Head

Nematodes do work, you need to apply twice yearly and keep the soil moist for these microscopic worms to work.

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