Effects of fungicides on powdery mildew, tree growth and cropping of apple |
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| Authors: | T LOCKE LINDA ANDREWS |
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| Institution: | Agricultural Development and Advisory Service, Kings Road, Evesham, Worcestershire WR11 5BE, UK;Luddington Experimental Horticulture Station, Stratford-upon-Avon, Warwickshire CV37 9SJ, UK |
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| Abstract: | In a 6-year orchard experiment, seven fungicide programmes were assessed for control of powdery mildew (Podosphaera leucotricha) and for long-term effects on growth and cropping of the apple cultivar Cox's Orange Pippin. Programmes based on binapacryl, bupirimate, fenarimol, nitrothal-isopropyl and triadimefon gave better control than dinocap or triforine. The heaviest cumulative yields of marketable fruit were obtained with the non-systemic fungicides binapacryl and nitrothal-isopropyl, the former significantly outyielding triadimefon and triforine over 6 years. Tree vigour, as assessed by extension shoot length and internode length, was found to be better after 4-5 years of programmes based on binapacryl than on triadimefon or fenarimol. A relation was demonstrated between cumulative marketable yield and mean annual mid-season incidence of secondary mildew on extension shoot leaves. |
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