UGA plant pathologist cautions Georgia grape growers against fungicide resistance to downy mildew

By Clint Thompson, University of Georgia

Fungicide resistance to downy mildew disease is a growing concern for Georgia grape producers. University of Georgia Extension Fruit Disease Specialist Phil Brannen advises growers to modify their fungicide applications to combat the increasing resistance.

“If producers properly rotate the chemical ingredients (used in the different fungicides) that treat for downy mildew, this will help our chemical classes be sustainable for years to come,” Brannen said. “We have already essentially lost one of our fungicides — the quinone outside inhibitors (Qol) — and we simply can’t afford to lose more classes if we are to manage this aggressive disease in the future.” Continue reading