Effect of low volume copper sprays with polyisobutene sticker on mango blossom blight (Glomerella cingulata) in Dominica |
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| Authors: | C Prior K Ryder |
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| Institution: | 1. CAB International Institute of Biological Control , Imperial College , Silwood Park, Ascot, Berkshire, SL5 7PY, U.K.;2. CAB International Institute of Biological Control , Imperial College , Silwood Park, Ascot, Berkshire, SL5 7PY, U.K.;3. Statistics Department , Rothamsted Experimental Station , Harpenden, Hertfordshire, AL5 2JQ, U.K. |
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| Abstract: | Abstract Two spraying strategies to control mango blossom blight caused by Glomerella cingulata were tested in Dominica In one trial, a single dose of 4% copper oxychloride (18 g per tree) was applied to foliage before flowering had started, while the other trial compared fortnightly applications of concentrations up to 2%, starting after flowering. The early single dose gave a significant increase in fruit set, whereas the repeated doses gave no significant effects. Early application, followed by a low volume spraying of protectant fungicides, may reduce the cost of disease control. The addition of 0.5% polyisobutene sticker, tested in the single dose trial, gave a consistently improved fruit set compared to the non‐sticker treatment, significant at one recording date; the overall evidence was encouraging. In vitro tests showed that the fungus was less sensitive to copper than to chlorothalonil and some systemic fungicides. |
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| Keywords: | Mango Mangifera indica anthracnose Glomerella cingulata fungicides copper oxychloride sticker polyisobutene |
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