Effects of scheduling applications of benomyl, captafol and chlorothalonil on ascochyta blight of lentil

Authors: Beauchamp, Chantal Jeanne; Morrall, R. A. A.; Slinkard, A. E.
Abstract: The effects on ascochyta blight of lentil of up to three applications of benomyl and captafol in 1983 or captafol and chlorothalonil in 1984 and 1985 were investigated at several locations in Saskatchewan. In 1983, captafol induced mean seed yield increases of about 30% and mean decreases in frequency of seed infection of 25% compared to the checks. The effects of benomyl were slight. Seed yield increased by 15% and seed infection decreased by about 20% with two or three sprays of captafol compared to one spray. In any treatments involving the first date of application, seed yield increased by about 25% and frequency of seed infection decreased by 30% compared to application begun 9 or 18 days later. In 1985 similar results were obtained with both captafol and chlorothalonil at Saskatoon, Smeaton and Star City. However, no significant differences in seed yield were noted at Saskatoon and Star City. At Smeaton, seed yield increased by 12% with three fungicide applications compared to one, and by 19% when application began on date one instead of date two or three. The same trends with frequency of seed infection occurred at all locations. A mean decrease of 50% occurred when all fungicide treatments were compared to their checks, or when application began on date one. Apparently, yield losses and seed infection were prevented by early as opposed to late application, but these effects were linked to weather conditions.
Document Type: Article de recherche
Issue Date: 29 December 2009
Open Access Date: Restricted access
Document version: VoR
Permalink: http://hdl.handle.net/20.500.11794/35083
This document was published in: Canadian journal of plant pathology, Vol. 8 (3), 260-268 (1986)
Taylor & Francis Online
Alternative version: 10.1080/07060668609501798
Collection:Articles publiés dans des revues avec comité de lecture

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