Publication Date:
1980-06-01
Description:
The distribution of fungitoxic activity in twig samples taken from the crown of elm trees (Ulmusamericana 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 was 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 methyl benzimidazol-2-yl carbamate hydrochloride (MBCC) invitro, whereas Calixin and Meltatox were not active against Ceratocystisulmi (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.
Print ISSN:
0045-5067
Electronic ISSN:
1208-6037
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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