Agroclimatical analysis of plum pox virus spread in Slovakia

In this report, the plum pox virus (PPV) spread from the point of view of agroclimatical conditions on the territory of Slovakia is analysed. The worst condition for the PPV spread was found in a warm macroregion. The air temperature sum in this macroregion during vegetative period ranged from 2400 to 3100 degrees C. The worst condition for the PPV spread was found in dry subregions of the macroregion. These were defined by differences between potential evapotranspiration and rainfall sums which ranged from 50 to 150 mm during summer months (from June to August). The decrease in air temperature sums and the increase of moisture in the environment as well as the severity of winter period was found to support the occurrence and spread of PPV.