Fungicide sensitivity of tomato leaf mold fungus (Passalora fulva) and control effect of fungicides in Wakayama Prefecture

Abstract

This study investigated the sensitivity of 92 isolates of Passalora fulva from tomato plants in Wakayama Prefecture to thiophanate-methyl, penthiopyrad, boscalid, azoxystrobin, and triflumizole using agar dilution methods. All isolates exhibited reduced sensitivity to more than two fungicides. Bioassays using tomato seedlings showed that mancozeb WP (wettable powder), TPN WP, and iminoctadin-albesilate WP were effective against two strains resistant to multiple fungicides.