Control Effect of 10.4% Seed Coating of Imidacloprid and Diniconazole on Wheat Aphids and Sharp Eyespot

The control effect of 10.4% seed coating of imidacloprid diniconazole on wheat aphids and sharp eyespot were studied with laboratory test and plot experiments,six treatments with different dose of Imidacloprid Diniconazole and different ratio of seed to Imidacloprid or Diniconazole were used for winter wheat cultivar Zhengmai 366.The results showed that no negative effects of the investigated pesticide on wheat germination,emergence and growth were observed when using the ratio of pesticide to seed as 1∶50~1∶70.The higher the dosage of the pesticide was,the better of the control effect was.The controlling effect on wheat aphids were 85.61%~97.71% and 80.15%~93.38% when the ratio of pesticide to seeds was 1∶50 and 1∶60,respectively,and there was no significant difference compared to the reference pesticide(600 g·L-1 Imidacloprid FS 1∶300).For the ratio of pesticide to seed of 1∶70,its control effect on aphids was 91.32%~94.91% at the initial stage of aphids attack.The effect was a little less than those of the pesticide to seed ratios of 1∶50 and 1∶60,and the reference pesticide.During the middle and late stages of aphids attack,the effect of pesticide to seed ratio of 1∶70 on aphids controlling was 74.88%~83.27%,which was significantly lower than that of the pesticide seed ratios of 1∶50 and 1∶60,and the reference pesticide.The effect of pesticide to seed ratio1∶50 on controlling wheat sharp eyespot and white head were 76.91%~86.64% and 78.29%,respectively,which was slightly higher than that of the reference pesticide(12.5% Diniconazole WP 1∶1 500).The effect of pesticide and seed ratio 1∶60 on controlling wheat sharp eyespot and white head was 69.14%~80.87% and 72.68%,respectively,which was significantly lower than the ratio of 1∶50,but no significant difference was observed compared to the reference pesticide.The effect of the 1∶70 treatment on controlling wheat sharp eyespot and white head was 60.75%~78.35% and 64.43%,respectively,which was significantly lower than the reference pesticide and the 1∶50 and 1∶60 treatments.Therefore,10.4% Imidacloprid Diniconazole was an ideal pesticide on controlling wheat aphids and sharp eyespot.The best pesticide and seeds ratio was 1∶50-60.