Effectiveness of New Systemic Fungicides for Control of Powdery Mildew of Begonia

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Abstract
The new systemic fungicides bitertanol, CGA 64251 (1-[2-(2,4-dichlorophenyl)-4-ethyl-1,3-dioxolan-2-ylmethyl]-1H-1,2,4-triazole), fenarimol, triadimefon and triforine were effective preventive and eradicative mildewcides on begonia when applied as foliar sprays. Triadimefon and CGA 64251 gave long-term prevention of powdery mildew when applied as dilute soil drenches. These fungicides were less phototoxic to flowers than currently used fungicides. Even though applied before inoculation, these fungicides killed Oidium begoniae after haustorial formation and minimal hyphal growth had occurred, but before sporulation was initiated.

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