Effectiveness of Preventive Fungicide Treatments in Controlling Plasmopara Viticola Outbreaks

The effectiveness of preventive fungicide treatments in controlling outbreaks of Plasmopara viticola (Berk. & M.A. Curtis) Berl. & De Toni, was tested on experimental grapevine plots in Smilica, Kavadarci, Republic of North Macedonia, during the spring-summer of 2023, characterized by high humidity and abundant rainfall. Two variants were implemented: (i) a control plot and (ii) a plot with a preventative fungicide treatment.The Climate Forecast System Reanalysis (CFSR) is a climate dataset used for intraday climate predictions of rainy weather, where chemical treatments were carried out immediately before the onset of precipitation as a necessary measure for plant protection.