70%噻虫嗪WS对水稻壮苗及稻飞虱的防治效果

Effects of 70% thiamethoxam WS on strengthening rice seedling and controlling planthopper Nilaparvata lugens(Stal)

【目的】研究70%噻虫嗪WS不同处理方式对水稻的壮苗效果及对稻飞虱的防治效果,以期获得该药剂对水稻种子的最佳处理剂量和处理方法,为水稻安全生产提供科学依据。【方法】70%噻虫嗪WS:水稻种子按照20g:100kg、40g:100kg和80g:100kg分别采用先包衣后浸种和先浸种后包衣的处理方式,以空白为对照,测定不同处理方式水稻种子发芽率、稻根长、叶片宽度、根数及对稻飞虱的防治效果。【结果】70%噻虫嗪WS按照药剂/种子为40g/100kg,采用先包衣后浸种处理方式的综合效果最佳,处理后4d室内发芽率稳定为96.00%,30d平均根长为4.93cm,40d水稻1～5叶位叶片宽度明显较对照宽,45d的平均根数为54.0条,处理后15、30、45d对稻飞虱的防治效果均高于96.00%。【结论】采用70%噻虫嗪WS按照药剂/种子为40g/100kg先包衣后浸种的处理方式对水稻秧苗及稻飞虱的综合效果最好,可以在生产中推广应用。

[ Objective ]Effect of different doses of thiamethoxam WS （70%） on strengthening rice seedling and controlling planthopper was studied in order to screen its best dose and treatment method on rice seed. [Method]Germination rate, root length, leaf width, root number of rice seedlings and preventive effects of three different doses of thiamethoxam WS （20, 40 and 80 g for every 100 kg seeds） using two different methods （coating first and presoaking, presoaking first and coating） were investigated. [Result]The most satisfying combination was found as treatment of 40 g 70% thiamethoxam WS every 100 kg seeds （coated first and then presoaked）. The germination percentage （indoor） was stabilized at 96% after 4 days. The length of rice root was 4.93 cm after 30 days. Ten days later, leaf width of the top five leaves was found apparently larger than the control. The average number of root was 54 on the 45^th day. For the prevention of the planthopper, the control effect reached 96% on the 15^th, 30^th and 45^th day. [Conclusion]The application of 40 g 70% thi- amethoxam WS every 100 kg seeds （coated first and then presoaked） was recommended to get the best controlling effects at rice production.