Control Action Durations of DMI fungicides (Tebuconazole and Fenbuconazole) against Tea Anthracnose, Discula theae-sinensis (I. Miyake) Moriwaki & Toy. Sato

Abstract

The control action durations of DMI (demethylation inhibitor) fungicides (tebuconazole and fenbuconazole) against tea anthracnose (Discula theae-sinensis) were investigated by field tests with inoculation of the conidial suspension of pathogenic fungi. The curative effects of tebuconazole and fenbuconazole against tea anthracnose were similar and very high. The duration of the curative effect was 12 days after infection, and it decreased significantly 14 days or more after infection. Compared to the protective effects of TPN against tea anthracnose, which was observed for 7–8 days after application, the protective effects of tebuconazole and fenbuconazole were inferior and lasted for 6–7 days after application.