Special local need label for the fungicide Switch for aerial application in blueberries

Annemiek Schilder, Michigan State University Extension, Department of Plant, Soil, and Microbial Sciences -

This Special Local Need label for Switch fungicide applies only to the state of Michigan.

On June 18, 2014, Switch (cyprodinil and fludioxonil) 62.5WG received a Special Local Need (Section 24C) label for aerial application in blueberries. Michigan State University Extension reports this label only applies to the state of Michigan.

Switch fungicide is a systemic fungicide with good to excellent efficacy against anthracnose fruit rot (Colletotrichum acutatum), Alternaria fruit rot (Alternaria tenuissima) and Botrytis fruit rot (Botrytis cinerea). Switch has moderate efficacy against Phomopsis (Phomopsis vaccinii) and mummy berry (Monilinia vaccinii-corymbosi) in blueberries. Switch is a valuable addition because it represents a different chemical mode of action from the limited arsenal of blueberry fungicides labeled for aerial application.

Alternation of fungicides is important for fungicide resistance management. The recommended application rate is 11-14 oz in a minimum of 5 gallons per acre spray volume by air. Only one aerial application is allowed per season, but additional applications may be made by ground up to the maximum allowable a.i. per acre per year indicated on the federal label. Additional spray recommendations and precautions for aerial application are listed on the SLN label.

Dr. Schilder's work is funded in part by MSU's AgBioResearch.

This article was published by Michigan State University Extension. For more information, visit https://extension.msu.edu. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464).

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