PJB-2022-383
In Vitro Sensitivity Measuring and Field Control Effect of Fungicides against Tomato Early Blight
Xilin Sun
Abstract
We determined the effects of 13 fungicides on tomato early blight by mycelium growth rate method in vitro, and constructed the virulence regression equation and calculated the EC50 value. In addition, 3 of them with better inhibition effects were selected for field experiments to evaluate their effectiveness. Our results showed that 50% boscalid (WG), 50% iprodione (WP), and 43% fluopyram & trifloxystrobin (SC) exhibited stronger inhibitory effects on Alternaria alternata. The EC50 values of these three agents were 0.2283mg/L, 0.3856mg/L and 0.9784mg/L, respectively. But 70% propineb (WP), 250g/L azoxystrobin (SC), 40% chlorothalonil (SC) and 52.5% famoxadone & cymoxanil (WG) provided poor antifungal effects. The results of field efficacy trials indicated that the efficacy of 50% boscalid (WG) and 50% iprodione (WP) were 82.01% and 83.47%. It is recommended to use these two fungicides with good effects for the prevention and control of early blight in production.
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