Additional studies on the chemical control of onion white rot (Sclerotium cepivorumBerk.) in New Zealand
作者:
A. Stewart,
R.A. Fullerton,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1991)
卷期:
Volume 19,
issue 2
页码: 129-134
ISSN:0114-0671
年代: 1991
DOI:10.1080/01140671.1991.10421790
出版商: Taylor & Francis Group
关键词: Allium cepa;chemical control;dicarboximides;iprodione;onion;procymidone;Sclerotium cepivorum;vinclozolin;white rot
数据来源: Taylor
摘要:
Various methods of application of the fungicide procymidone were evaluated for the control of onion white rot (Sclerotium cepivorumBerk.) in field trials carried out in the 1986–87 and 1987–88 crop seasons. The conventional method of seed treatment followed by foliar sprays (monthly × 4) reduced disease incidence by 71 and 95% (of untreated control) in the respective seasons. When applied as a dispersible granule to the soil surface above the seed immediately after planting, disease incidence was reduced by 89 and 95% respectively. Application of procymidone to the soil surface as a spray gave similar control but induced transient symptoms of phytotoxicity in the young seedlings. A slow release formulation of procymidone applied as a seed dressing was more effective than the conventional formulation for seed dressing, and, when followed by foliar sprays, an 85% reduction in disease incidence was obtained. Iprodione applied as a seed treatment followed by four foliar sprays gave a moderate reduction in disease incidence (42%, 60% in respective trials). Procymidone granular formulations are convenient to apply and highly effective against the disease and offer good commercial prospects.
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