防治稻飞虱药剂筛选试验

进行25％噻虫胺水分散粒剂和25％吡蚜·噻嗪酮可湿性粉剂防治稻飞虱的田间药效试验，结果表明：每667m。使用25％噻虫胺水分散粒剂4g，药后3d、7d、14d的防效为88．68％、94．91％和95．11％；每667m。使用25％吡蚜·噻嗪酮可湿性粉剂40g，药后3d、7d、14d的防效达89．38％、94．42％和97．29％。两种药剂防治稻飞虱均具有较好的防效性和持效性，且对水稻生产安全，在生产上可作为防治稻飞虱的药剂交替使用。

Screening test on drugs for controlling rice planthopper

A field trial on drug efficacy of 25% clothianidin WG and 25% pymetrozine, buprofezin WP against rice planthopper was conducted. The aim was to study the control efficiency of water dispersible granules and wettable powder. In the field test conditions, The result showed that, the control efficacy of 25% clothianidin WG on rice planthopper at dosage of 4 g/667 m2 were 88.68%, 94.91% and 95.11% respectively after treatment for 3, 7and 14 days; The control efficacy of 25% pymetrozine, buprofezin WP at dosage of 40 g/667 m2 were 89.38%, 94.42% and 97.29% respectively after treat- ment for 3, 7and 14 days. Both two drugs have better control and holding effects for controlling rice planthoppers and are safe in rice production, they can be used interchangeably as drugs to control rice planthopper.