Application Effect of Pesticide Synergist ＇ Jijian＇ on Wheat Stripe Rust

摘要

cqvip:The aim of this study is to clarify the application effect of pesticide decrement synergist‘Jijian'on wheat stripe rust. Sampling investigation,randomized block design and statistic analysis were carried out to find out the field efficacy of adding‘Jijian'to triadimefon WP and propiconazole EC on controlling wheat stripe rust. The results showed that during the epidemic period of stripe rust,the control effects on the 7^(th) and the 19^(th)d reached more than 93% and 100%,respectively,by the application of 15% triadimefon WP of 1 200 g/hm^2 and 25% propiconazole EC of 600 mlhm^2,respectively for 2 times; when 15% triadimefon WP of 840 g/hm^2+ ‘Jijian'of 225 g/hm^2 or 25% propiconazole EC of 420 mlhm^2+‘Jijian'of 225 g/hm^2 were applied( adding‘Jijian'and reducing the dosage of the 2 pesticides by 30%),the control effect on the 7 thd was 89. 4% and 91. 7%,respectively,while the control effect on the 19^(th)d was 99. 8-100%; when15% triadimefon WP of 720-600 g/hm^2+ ‘Jijian'of 225 g/hm^2 or 25% propiconazole EC 360-300 mlhm^2+‘Jijian'of 225 g/hm^2 were applied( adding‘Jijian'and reducing the dosage of the 2 pesticides by 40%-50%),the control effect on the 7^(th)day reached more than 78. 0%,while the control effect on the 19 th day was 97. 7%-99. 8%. There was no significant difference on the control effect at the 7^(th)d between the treatments using the 2 pesticides alone and the treatments adding‘Jijian'and reducing the dosage of the 2 pesticides by 30%,but all had significant differences from the treatments adding‘Jijian'and reducing the dosage of the 2 pesticides by 40%-50%. There was no significant difference on the control effect of the 19 thd among different treatments. Therefore,if the disease is not serious,the application of‘Jijian'can reduce the application amounts of pesticides by 40%-50%,that is,15% triadimefon WP of 720-600 g/hm^2+ ‘Jijian'of 225 g/hm^2 or 25% propiconazole EC of 360-300 ml/hm^2+‘Jijian'of 225 g/hm^2,which is helpful to reduce the pesticide application amounts and pesticide residue pollution,and save the control costs.