Efficacy of Genetic Resistance and Fungicide Application against Fusarium Head Blight and Mycotoxins in Wheat under persistent Pre- and Post-anthesis Moisture

Field experiments were conducted to investigate the efficacy of fungicide treatments in combination with genetic resistance against Fusarium head blight (FHB) and its associated mycotoxins under persistently wet pre- and post-anthesis conditions in plots inoculated with -colonized corn spawn. Treatm...

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Bibliographic Details
Published inPlant disease
Main Authors Moraes, Wanderson Bucker, Madden, Laurence V, Paul, Pierce Anderson
Format Journal Article
LanguageEnglish
Published United States 26.04.2022
Subjects
Fungi
Yield loss and economic impacts
Field crops
Crop Type
cereals and grains
Causal Agent
Disease management
Epidemiology
Subject Areas
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Summary:Field experiments were conducted to investigate the efficacy of fungicide treatments in combination with genetic resistance against Fusarium head blight (FHB) and its associated mycotoxins under persistently wet pre- and post-anthesis conditions in plots inoculated with -colonized corn spawn. Treatments consisted of a single application of prothioconazole + tebuconazole at early anthesis [PA], or at 3 [P3], 6 [P6], or 9 [P9] days after early anthesis, or PA followed by a single application of metconazole at 3 [PA+C3], 6 [PA+C6], or 9 [PA+C9] days after early anthesis. PA and P3 were the most efficacious of the single-application treatments in terms of mean percent control of FHB index (IND), deoxynivalenol (DON), zearalenone (ZEA), and mean increase in grain yield and test weight (TW) relative to the nontreated susceptible check (S_CK). The double-application treatments (PA+C3, PA+C6, and PA+C9) were the most effective of all tested fungicide programs. However, relative to S_CK, the highest overall mean percent reduction in IND, DON, and ZEA, and increase in grain yield and TW were observed when the double-application fungicide programs were integrated with genetic resistance. The estimated net cash income (NCI) of the integrated management (IM) programs was consistently higher than the NCI of other tested programs across different grain prices and fungicide application costs. Thus, the benefits of the two-treatment IM programs under highly favorable conditions for FHB development were enough to offset the cost of two applications, making these programs profitable.
ISSN:0191-2917