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 Blackspot
Plants affected: Roses.
Symptoms: From mid-summer onwards, irregular rounded black patches appear on rose leaves.
Prevention/Control: Chemicals need to be applied following a strict spray programme to be effective. Dig up and burn badly affected varieties and grow naturally disease resistant types. The worst leaves can be picked off by hand and together with leaves that have fallen on the ground should be burned - good hygiene is important.
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Powdery mildew
Plants affected: Indoor and outdoor plants, particularly roses, and plants that are often too dry.
Symptoms What looks like a dusting of talcum powder over the upper sides of younger leaves.
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Prevention/Control: Keep plants well fed and watered. Remove and destroy infected leaves or spray with a suitable fungicide, such as one containing carbendazm or sulphur.
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