The effectiveness of funqicides in the control of white rust (Puccinia horiana P. Henn) of Chrysanthemums

Abstract

The object of this study was to determine the effectiveness of some fungicides such as Dithane M-45 (mancozeb) - 0.3%, Plantvax (oxycarboxin) - 0.075%, Saprol (triforine) - 0.1%, Calirus (benodanil) - 0.3%, Bayleton 5 WP (triadimefon) - 0.05%, Baycor (biloxazol) - 0.1%, Vigilex (dichlobutrazol) - 0.04% in the control of chrysanthemum white rust (Puccinia horiana). Tests were conducted in the period 1979-1980. Plants of four varieties were sprayed 8 times weekly. The disease was completely suppressed in the combinations with Plantvax, Saprol, Calirus, Bayleton 5 WP, Baycor and Vigilex. The disease index of Puccinia horiana infection on chrysanthemums was only slightly lower when Dithane M-45 was applied. Plantvax was phytotoxic for all tested varieties, Vigilex suppressed plant growth, treated plants were 3/4 shorter in comparison with plants of all the other combinations.