My solidago was covered with black flies last year and year before. any idea what they are and is there any solution I can spray them with to eradicate the same problem this year. Breda from Camross, Wexford.
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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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