Effects of fungicide treatments of potato sprouts on assessment of resistance toSynchytrium endobioticum(Schilb.)Perc. using theGlynne–Lemmerzahl method

Abstract

Five different active fungicides (pencycuron, mancozeb, copper oxychloride, azoxystrobin, and a mixture of carboxine and thiuram) were compared to protect potato sprouts from rotting when they are being tested using the Glynne–Lemmerzahl method. Sprouts were treated before or after inoculation with fresh warts ofSynchytrium endobioticum. No symptoms of potato wart disease were observed on sprouts treated before inoculation. For sprouts treated after inoculation, symptoms of potato wart disease were recorded with all tested fungicides except azoxystrobin. In the case of pencycuron, symptoms were observed only when the concentration of fungicide was decreased to 20 mL L−1. Among the active substances tested, the best results were obtained for copper oxychloride after inoculation using doses recommended by manufacturers.