Pesticidi i Fitomedicina (Jan 2007)
Uncinula necator (Schow) Burr., the Causal Agent of Grape Powdery Mildew: Role of Winter and Early Spring Treatments
Abstract
Three preceding articles (Miladinović et al., 2007a, 2007b, 2007c) covered the state-ofthe art on the pathogen and disease, the source of inoculum and pathogen infection potential, and the microclimatic conditions of Pogdorica Vineyards. This segment of the study focuses on winter and early spring treatments of grape vine for its protection from Uncinula necator, the causal agent of powdery mildew.The effects of winter and early spring treatments were investigated under production conditions over a period of three experimental years (2002, 2003 and 2004). Winter treatment was conducted with products based on DNOC and copper hydroxide, and early spring with pirazophos. During the rest of the vegetation season, the same treatments were carried out in all test variants with products based on penconazole, kresoxim-methyl and sulphur, and their combinations. Winter treatment with products based on DNOC was found to lead to a significant statistical decrease in disease intensity, even without any further treatments over the vegetation season. The products based on copper hydroxide provided weaker protection. After winter treatment, early spring treatment was not found to have a significant effect.However, when winter treatment was missing, early treatment in the spring was very important, especially for the protection of bunches.
