Fungicides for wheat seed treatment

Abstract

A seed treatment trial was conducted at the National Wheat Research Center in Passo Fundo, RS, in 1979, to study the effect of fungicides on the control of seed pathogens of wheat. Two fungicides and four mixtures of fungicides were tested. Two seedlots of the cultivar CNT 9 were used. The fungicides were selected on the basis of their effectiveness against Helminthosporium sativum Pam., King. & Bakke. The occurrence of fungi in the seeds were evaluated by laboratory tests. The percentage of germination in the field, number of heads/unit area and yield were also evaluated. The best control of H. sativum on seeds was obtained with Panoctine (Guazatine 40%). The stand in the field was evaluated 17 days after sowing. Cercoran (Metiltiofanato 50% + Thiran 30%); Dithane M-45 and Benlate T (Benomyl 20% + Thiran 20%) were statistically superior to the check. When the same evaluation was conducted 31 days after sowing only Cercoran and Dithane M-45 showed plant stands higher than the check. Seed treatment did not increase the number of heads/unit area. The average yield of the two seedlots treated with Cercoran was significantly superior to the check.