Experiments with MBC derivatives for the control of Dutch elm disease |
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Authors: | J N GIBBS D R CLIFFORD |
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Institution: | Forestry Commission, Alice Holt Lodge, Wrecclesham, Farnham, Surrey;Long Ashton Research Station, Bristol, BS18 9AF |
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Abstract: | Preparations of methyl benzimidazol-2-ylcarbamate (MBC) hydrochloride stabilized with HC1, MBC nitrate stabilized with lactic acid and MBC bisul-phate stabilized with KHS04 were made from technical MBC. As it was the least phytotoxic to elm shoots, the hydrochloride was selected for field experiments on the control of Dutch elm disease using 6 m elms. In protectant experiments using 1.51 of 0.25 or 0.5 % MBC per tree, only five of eighteen injected trees became infected while all the control trees were severely diseased. In curative experiments, injection with 0.25 % MBC 2 and 4 wk after inoculation with Ceratocystis ulmi kept symptoms to < 1 and 5% respectively, compared with 76% in untreated inoculated trees. MBC at 0.5 % Save similar results. |
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