Develop sustainable pest management recommendations based on cold-climate cultivar copper and sulfur sensitivity and disease resistance. Copper and sulfur pesticide sensitivity trials were conducted in Wisconsin, as injury from these pesticides occurs in some grape cultivars, but the sensitivity of cold-hardy cultivars was not known. Trials were also conducted in no-spray vineyards in two locations in Wisconsin to determine relative disease resistance.
Sensitivity of northern grape cultivars to fungicides and cultivar susceptibility to diseases. Copper, sulfur, and difenoconazole fungicides cause leaf injury to some wine grape cultivars, but the sensitivity in cold-hardy, northern varieties is unknown. In 11 trails conducted over four years, 15 cultivars were not highly sensitive to these fungicides. Notable exceptions included Brianna (sensitive to copper) and Leon Millet and Marechal Foch (sensitive to sulfur).
Patty McManus
Webinars
- Integrated Disease Management Based on Cultivar Susceptibility and Fungicide Sensitivity, by Patty McManus and David Jones PDF of McManus slides PDF of Jones slides
- Grape Disease Management Basics (and All about Anthracnose), by Wayne Wilcox and Patty McManus Chat transcript from 7pm session Q&A from post-webinar survey
- Northern Grapes Project Research Results: Fungicide Sensitivity and Vine Nutrition of Cold-Hardy Cultivars, by Patty McManus and Carl Rosen PDF of slides