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United States Department of Agriculture

Agricultural Research Service

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Research Project: Optimizing Management of Sclerotinia Diseases Through Fungicide Use

Location: Sunflower Research

Project Number: 5442-21220-028-12
Project Type: Specific Cooperative Agreement

Start Date: Jul 01, 2011
End Date: Sep 30, 2014

Objective:
The overall objective of this proposal is to optimize management of sclerotinia stem rot (SSR) on canola. Specific objectives will be 1) develop a regional base line of fungicide sensitivity to common fungicides used for control of S. sclerotiorum in the north central region; 2) identify fungicide mixtures that provide improved SSR control on canola; and 3) characterize the value of new biological control compounds available in the U.S. market.

Approach:
To achieve the objectives we propose to conduct replicated laboratory and field trials. Laboratory trials will be conducted to develop base-line information on fungicide sensitivity to fungicides currently registered for use to control SSR in canola, soybean, and dry bean. The information generated by these studies will serve in the detection of isolates with increased fungicide resistance. Laboratory trials will also be used to calculate 50% lethal doses (LD50) for mixtures that will be evaluted in the field as well as to evalute the probability of development of resistance. Field trials will be used to optimize concentrations of fungicides in mixtures. Special attention will be made to the analysis of the economic aspect of disease control. Field trials will also be used to identify the relative value of new biological compounds that are getting into the U.S. market, as well as of others that have not been previously evaluated for use in canola. Efforts will be made to create high disease pressure by inoculating ascospores twice on flowering canola plants. The research proposed here is included as one objective in the Strategic plan of the Sclerotinia Initiative. Results from these sutdies will be available for growers in a short period of time since we plan on presenting this information at field days and other growers meetings.

Last Modified: 7/28/2014
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