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Frogeye Leaf Spot Resistance Increasing in Soybean
Feb 22, 2018
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By Loren Giesler
Figure 1. Frogeye leaf spot.
Recently
Iowa State University confirmed Cercospora sojina
, the pathogen that causes frogeye leaf spot of soybean, having resistance to quinone outside inhibitor (QoI, strobilurin) fungicides in Iowa.
This report is a reminder to all of us of how important resistance management is for pathogens as well as weed and insect pests. While we have not identified C. sojina to have fungicide resistance in Nebraska, due diligence is needed by all farmers to ensure practices are not encouraging resistance development. A map of the current distribution of strobilurin-resistant frogeye at
Integrated Pest Management – Pest Information Platform for Extension and Education (ipmPIPE)
shows there is good distance between Nebraska and any confirmed fields at this time.
A plan for resistance management includes
the use of genetics to reduce disease potential,
residue management and rotation to break down inoculum of the pathogen, and
the treatment of fields before significant levels of disease are present using fungicides with multiple modes of action.
Source: unl.edu
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