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Diseases of Perennials and Control. Perennials, taken as aclass, under fairly favourable conditions are not particularly susceptibleto disease. In general, when diseases attack perennial plants, thesafest thing to do is to throw them away. Aphis and minor insecttroubles may be easily controlled by spraying. The following plants, if attacked by leaf spots or mildews, may besaved by fungicides (See Page 77): Alyssum (mildew). Anemone (root decay and rust). Destroy affected roots. Aquilegia (mildew and black spot). Campanula (red and brown rust). Keep away from pinus rigida. Chrysanthemum (leaf spot or powdery mildew). If rusted, plants should be |
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