Location: Sunflower and Plant Biology Research
Project Number: 5442-21220-028-20-S
Project Type: Specific Cooperative Agreement
Start Date: Jul 1, 2011
End Date: Feb 28, 2013
The objectives of this study are to: 1) establish uniform fungicide trials in five environments in four states in order to identify fungicides that are efficacious against the sclerotinia head rot phase of the sunflower pathogen Sclerotinia sclerotiorum; and 2) to develop a yield loss model for head rot.
A diverse group of fungicides will be evaluated for Sclerotinia head rot control on a commercial oilseed hybrid at five locations in four states (Sabin, MN; Carrington and Langdon, ND; Brookings, SD; and Scottsbluff, NE). Disease will be facilitated by artificial inoculation with ascospores and mist irrigation. A core set of 12 treatments (including a non-treated control and a non-inoculated treated-control) will be evaluated at all locations. The core set of treatments will primarily include chemicals labeled on other crops for white mold control but will also include experimental compounds. A non-inoculated fungicide treated check should provide an estimate of yield potential and facilitate development of yield loss assessment based on disease incidence and/or severity. Fungicides will be applied at the recommended highest rate, as determined by alternate crop labels and/or company/cooperator recommendations. Each location is likely to evaluate additional compounds beyond the core set, depending on space, external funding, and cooperator interest. Disease evaluations will be done at growth stages R-7 and R-8. Plots will be harvested for yield, and quality factors such as oil content and test weight will be measured.