Distribution of methylbenzimidazol 2 yl carbamate phosphate in elm ulmus americana effects of chemical properties and formulation variables

Roy, D.N.; Purdy, J.R.; Ayyamperumal, P.

Canadian Journal of Forest Research 10(2): 143-151


ISSN/ISBN: 0045-5067
Accession: 005179098

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The distribution of fungitoxic activity in twig samples taken from the crown of elm trees (U. americana L.) after injection with methyl benzimidazol-2-yl carbamate phosphate (MBCP) was erratic with respect to tree size and dosage. Evidence is presented which supports the view that this resulted from stoppage of flow in the xylem, probably as a result of precipitation of the free base (MBC), and aggravated by variables associated with the fungicide and its formulation. Physiological and environmental effects were partly or completely masked. Bioassays showed that MBCP was more active than methylbenzimidazol-2-yl carbamate hydrochloride (MBCC) in vitro, whereas Calixin and Meltatox were not active against Ceratocystis ulmi (Buism.) below a 1000 ppm concentration. A new elm tissue culture bioassay showed that MBCP was not phytotoxic at low levels. The insecticides aldecarb, diazinon, dimethoate, Meta-Systox R and phosphamidon were excessively phytotoxic, and thus not suitable as injectable systemic insecticides.