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室内采用根区施药,田间采用喷雾和根区施药的方式对移栽前1天秧苗用吡虫啉和吡蚜酮进行处理,以获得对水稻分蘖期白背飞虱和褐飞虱具有较好防效的药剂剂量及施药措施。室内试验表明,药后22天50%吡虫啉可湿性粉剂所选剂量中以每hm~2用量300 g对褐飞虱的防效最高,为95.24%;50%吡蚜酮可湿性粉剂所选剂量中以每hm~2用量225 g对褐飞虱的防效最高,为84.13%。田间试验表明,药后33天50%吡蚜酮可湿性粉剂每hm~2用量225 g的喷雾和根区施药对白背飞虱的防效达82.33%~91.10%,对褐飞虱防效达80.80%~89.54%;50%吡虫啉可湿性粉剂每hm~2用量300 g的喷雾和根区施药对白背飞虱的防效达73.91%~93.18%,均具有较高的防效且它们的持效期达33天,超过一般水稻的分蘖期(30天左右)。上述结果表明,采用上述2种药剂的带药移栽可有效控制分蘖期白背飞虱和褐飞虱的发生为害。
Indoor use of root zone drug application field spraying and root zone of the way to the day before transplanting seedlings with imidacloprid and pymetrozine treatment to gain control of whitebacked planthopper and brown planthopper at tillering stage has a good effect Dose and application of pharmaceutical measures. Laboratory tests showed that the best dosage of 300 g imidacloprid WP at dosage of 300 g / hm2 was 95.24% for the BPH at 22 days after drug application. The dose of 50% pymetrozine WP The dosage of 225 g per hm ~ 2 had the highest control effect on brown planthopper, which was 84.13%. Field trials showed that the control efficacy of spray and root application of 50% pymetrozine WP at a dosage of 225 g per hm ~ 2 for 33 days on whitebacked planthopper (Sogatella furcifera) was 82.33% ~ 91.10% and that on BPH was 80.80 % ~ 89.54%. The control effect of spray and root application of 50% imidacloprid WP (300g / hm2) on whitebacked planthopper (Sogatella furcifera) was 73.91% ~ 93.18% Effective for up to 33 days, more than the average tillering stage of rice (30 days or so). The above results show that the use of these two agents with drug transplanting can effectively control the occurrence of whitebacked planthopper and brown planthopper at the tillering stage.