Verifica di diversi metodi di rilevamento di infezioni causate da Plasmopara viticola e Uncinula necator su vite

Two alternative methods for the infection evaluation were applied to the data assessed using two different scales on four field trials concenrning the efficacy of fungicides against grapevine downy and powdery miledw. Statistical analysis showed that in some cases significant differences depended on the applied method. Some parameters, proposed in order to evaluate the infection severity on the host, do not adequately describe the field situation. The infection index I%I, as proposed by Townsend and Heuberger (1943), takes into account both infection severity and incidence.