Some of our peach producers also produce apples. Abound fungicide has significant phyto issues on apples (see below from the label). With my previous post on blossom blight, you can substitute Merivon or Pristine for Abound when controlling early-season green fruit rot — if you want to also use the same sprayer on apples. Merivon is limited to 3 applications per year. Pristine can be applied five times per year. Abound would likely have better antisporulant activity, but you don’t want to take the leaves off your apple trees or mark up your apples with it either.
Abound is extremely phytotoxic to certain apple varieties.
AVOID SPRAY DRIFT. Extreme care must be used to prevent injury to apple trees (and apple fruit).
DO NOT spray Abound where spray drift may reach apple trees.
DO NOT use spray equipment which has been previously used to apply Abound to spray apple trees.
Even trace amounts can cause unacceptable phytotoxicity to certain apple and crabapple varieties.
Phil Brannen
Phil Brannen is a Professor in the Plant Pathology Department at the University of Georgia. He attended the University of Georgia for his undergraduate degree in Plant Protection and Pest Management, where he also received an M.S. in Plant Pathology, followed by a Ph.D. in Plant Pathology from Auburn University. He has extensive experience with disease management programs in numerous cropping systems. He serves as the extension fruit pathologist for Georgia – conducting research and technology transfer for multiple fruit commodities. His efforts are directed towards developing IPM practices to solve disease issues and technology transfer of disease-management methods to commercial fruit producers. He also teaches the graduate level Field Pathology Course, the History of Plant Diseases and their Impact on Human Societies Course, team-teaches the IPM Course, coordinates the Viticulture and Enology in the Mediterranean Region Course (Cortona, Italy), and guest lectures in numerous other courses throughout the year.