Abstract
Distribution and persistence of methyl 2-benzimidazole carbamate phosphate (MBC-PO4) injected into American elms [to control dutch elm disease caused by Ceratocystis ulmi] in late spring depended on rate of application but was independent of carrier volume over the ranges of application rates and volumes studied. The amount of MBC-PO4 in leaves and twigs of trees injected in late spring decreased rapidly during the 3-4 mo after injection. Distribution and persistence were best with 6 and 12 times the recommended rate for prophylaxis. The chemical was not detected in the spring following treatment. MBC-PO4 injected into plantation elms in early fall persisted over winter and was well distributed in new growth the following spring.

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