Optimizing Fungicide Use and Timing Based on Weather Conditions

Research Date
2014
Authors
Annemiek Schilder, Jeffrey Andresen, Christine Vandervoort
Priorities
Best Practices, Crop Quality, Disease Management, Pest Management
Crop Categories
Grapes
Beverage Categories
Wine

A study on environmental effects on fungicides applied to grape leaves showed that moderate temperatures were optimal for fungicide uptake and retention and that Abound (azoxystrobin) became undetectable when applied at 40 degrees F. Efficacy of Abound, Manzate (mancozeb) and Phostrol (phosphorous acid) against Phomopsis cane and leaf spot was optimal when applied as preventative sprays a week or less before infection. Fungicides sprayed on grape clusters in full bloom reduced cluster weight and number of berries at harvest, suggesting that they interfere with fertilization. Further research is needed but it seems advisable to avoid fungicide sprays at full bloom.

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This is the official website of the Michigan Craft Beverage Council. The Council has the mission to provide for research into Michigan agricultural products, such as fruits, hops and barley that are used in the production of Michigan wine, cider, beer, spirits and mixed spirit drinks.