Combined Virulence and Field Control Effect of Boscalid and Fludioxonil Against Gray Mold of Tomato
To determine the optimal ratio of boscalid and fludioxonil achieving the most effective control of botrytis cinerea in tomato,the toxicity of a single-active ingredient boscalid-based product and a single-active ingredient fludioxonil-based product,as well as 9 mixed products containing both the active ingredients with different ratios,against botrytis cinerea was evaluated using in vitro leaf disk method.The best combination was then selected for field efficacy test.The results showed that the EC50 values of boscalid and fludioxonil were 0.748 1 and 0.397 μg/mL,respectively.The mixture of the two active ingredients showed a synergic effect:5∶1,4∶1,3∶1,2∶1,1∶1,1∶2,1∶3,1∶4,1∶5.The highest synergistic effect(SR value of 1.91)observed at a ratio of 2∶1 for boscalid and fludioxonil.The results of the field efficacy test showed the control effect of 87.32%,74.35%and 78.43%against tomato botrytis for 30%boscalid and fludioxonil SC(1 500 times dilution),50%procymidone WP(600 times dilution)and 50%iprodione WP(600 times dilution),respectively.There was no significant difference in efficacy between the mixed formulated products of boscalid and fludioxonil and iprodione-based product,but both were significantly more effective than procymidone.Therefore,this paper recommended the use of 30%boscalid and fludioxonil SC for controlling tomato cinerea.
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