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What is causing the bumps on the leaves of my grape vine?

Our Advice:

The bumps are caused by the Erinose mite which is feeding on the undersides of the leaves. If only a few leaves are affected you can remove them. If the damage is more widespread apply sprays of SB Plant Invigourator or Organic 2 in 1 from Vitax in the Spring and again in late-summer when the mites are migrating and easier to control.

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