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2023 National Fusarium Head Blight Forum


FHB Management (MGMT)

Paper

Evaluation of Organic Fungicides Plus Cultivar Resistance to Reduce FHB and DON Infection of Barley in Vermont

Authors & Affiliations:

Heather Darby 1 and Hillary Emick 1
1. University of Vermont State and Agricultural College, Burlington, VT 05405
Corresponding Author: Heather Darby, heather.darby@uvm.edu

Corresponding Author:

Heather Darby
heather.darby@uvm.edu

Abstract:

Public interest in sourcing local foods has extended into beverages leading to a rapid expansion of the northeast malting industry. This has provided farmers with new market opportunities and many of these markets are interested in purchasing certified organic barley.  However, all farmers are struggling to produce barley that is not infected with Fusarium head blight (FHB) and the mycotoxin deoxynivalenol (DON). Hence integrated management strategies are essential for managing yield and quality losses from FHB. Most farmers in New England have experienced significant crop loss from FHB and some farmers have already stopped growing barley. At present, few farmers are specifically selecting varieties for resistance to FHB and even fewer are combining host resistance with fungicide applications. There has been little to no research conducted to evaluate organic approved fungicides. In Vermont during 2021 we observed the disease and yield impact of cultivar susceptibility, inoculation with Fusarium graminearum, and treatment with fungicides (organic and conventional comparison) at two timings. Overall, the growing season was dry and hot leading to low DON concentrations in the trial. The organic fungicides were not as effective as the conventional fungicide applied at heading. However, all fungicides provided enhanced yields compared to the Fusarium inoculated control. Additional research should be conducted to assess the efficacy of multiple applications of copper-based fungicide on FHB. 


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