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Optimization of chemical suppression of Alternaria dauci, the causal agent of Alternaria leaf blight in carrots
Year:
2001
Source of publication :
Plant Disease
Authors :
Ben-Noon, Erez
;
.
Shtienberg, Dan
;
.
Vintal, Haim
;
.
Volume :
85
Co-Authors:
Ben-Noon, E., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Shtienberg, D., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Shlevin, E., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Vintal, H., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Facilitators :
From page:
1149
To page:
1156
(
Total pages:
8
)
Abstract:
Alternaria leaf blight, caused by Alternaria dauci, is a major constraint to carrot production in Israel. Israeli carrot growers apply prophylactic sprays at 3- to 10-day intervals throughout the season until harvest, up to 30 sprays in a growing season. In this study, we attempted to optimize the chemical suppression of the disease, in order to reduce fungicide use. The efficacy of nine fungicides was determined in two field experiments. All fungicides reduced disease severity, but there were significant differences in efficacy among them. The most effective were difenoconazole and chlorothalonil; less effective were copper hydroxide, tebuconazole, trifloxystrobin, and mancozeb; the least effective in our experiments were flutrifol, propineb, and iprodione. The effect of the time of spray initiation on fungicide efficacy was determined in three field experiments. Qualitative (analysis of variance) and quantitative (regression) analyses of the data revealed that initiating sprays after disease onset reduced control efficacy. Thus, an action threshold model could not be developed for A. dauci in carrots. The time before harvest at which sprays could be terminated was tested in two field experiments and it was found that terminating sprays 14 days before harvest did not significantly affect the overall control efficacy. The main conclusions derived from these experiments were tested and corroborated in two additional field experiments.
Note:
Related Files :
Alternaria
Chemical supression
Crop Production
fungi
fungicides
integrated pest management
Israel
Spraying
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
23269
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:58
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Scientific Publication
Optimization of chemical suppression of Alternaria dauci, the causal agent of Alternaria leaf blight in carrots
85
Ben-Noon, E., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Shtienberg, D., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Shlevin, E., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Vintal, H., Department of Plant Pathology, ARO, Volcani Center, PO 6, Bet Dagan, Israel
Optimization of chemical suppression of Alternaria dauci, the causal agent of Alternaria leaf blight in carrots
Alternaria leaf blight, caused by Alternaria dauci, is a major constraint to carrot production in Israel. Israeli carrot growers apply prophylactic sprays at 3- to 10-day intervals throughout the season until harvest, up to 30 sprays in a growing season. In this study, we attempted to optimize the chemical suppression of the disease, in order to reduce fungicide use. The efficacy of nine fungicides was determined in two field experiments. All fungicides reduced disease severity, but there were significant differences in efficacy among them. The most effective were difenoconazole and chlorothalonil; less effective were copper hydroxide, tebuconazole, trifloxystrobin, and mancozeb; the least effective in our experiments were flutrifol, propineb, and iprodione. The effect of the time of spray initiation on fungicide efficacy was determined in three field experiments. Qualitative (analysis of variance) and quantitative (regression) analyses of the data revealed that initiating sprays after disease onset reduced control efficacy. Thus, an action threshold model could not be developed for A. dauci in carrots. The time before harvest at which sprays could be terminated was tested in two field experiments and it was found that terminating sprays 14 days before harvest did not significantly affect the overall control efficacy. The main conclusions derived from these experiments were tested and corroborated in two additional field experiments.
Scientific Publication
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