The Synergistic Complex Research Of Pyrazole Kresoxim And Boscalid To Prevent Tomato Gray Mold

In this study, the growth rate method is the main method for Botrytis cinerea indoor activity test to explore their scientific and reasonable proportion by mixing pyrazolo kresoxim and boscalid with different combinations. Then, the tomato safety testing and field efficacy trials are used to evaluate the safety of 45% pyrazole Kresoxim · polymyxin SC on the tested tomato varieties and tomato gray mold control effect in the field by spraying 45% pyrazole Kresoxim · polymyxin SC. The results are as follows:1, The vitro tests showed that: mixing 97% pyrazole Kresoxim original drug, 98% Boscalid original drug and two different drug combinations in different concentrations led to significant differences in the bacteria colony growth rates and showed great inhibitory action on tomato gray mold bacteria, The EC50 values of 97% pyrazole Kresoxim original drug and 98%Boscalid original drug are 11.45 μg/mL and 3.48 μg/mL respectively. In the 5 different mixed combinations,the combination with pyrazole Kresoxim and polymyxin, 15% pyrazole Kresoxim + 30% polymyxin EC50) has the minimum value as 2.94μg/mL and significant increasing effect with the efficiency factor SR = 1.54.2, The test agent of 45% pyrazole Kresoxim · Boscalid SC is safe to the growth of the tomato varieties and has no adverse effects. The test chemical of tomato gray mold had a better protection effect, The protection effect differences of the 202.5g/ha、270g/ha、337.5g/ha were highly significant level after the last drug treatment 8d. In the Baoji test site, the protection effect was about 76.18%~87.85% after the last drug 8d blade and the protection effect was about 78.17%~88.74% after the last drug 8d fruit. In theYangling test site, the protection effect was about 75.11%~85.88% after the last drug 8d blade and the effect was about 74.92%~84.79% after the last drug 8d fruit.3, The suitable spray rate for 45% pyrazole Kresoxim · Polyoxin SC suspensions is 202.5g/ha~337.5g/ha and suspensions should be sprayed when foreseeing the pathogenesis of tomato gray mold or in the early symptom appearance by spraying one time every 7 to 10 days and spraying 2 to 3 times continuously.