Hi Gerry, I've a beautiful white birch tree that has recently become infested by mini green caterpillars. Can you please advise how I can remove them before my poor tree ends up leafless? Many thanks.
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Over ten years, Gerry Daly answered more than 5,000 gardening questions. His knowledge is based in science and practical experience, and by working on radio and television. Access to the advice database is open
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