吡虫啉不同施药方法对花生蛴螬防控效果以及对产量的影响

Effects of different application methods of imidacloprid on control of peanut white grubs and yield increase of peanut

采用拌种、播种穴(沟)施药和开花下针前撒施毒土3种施药方法,研究新烟碱类杀虫剂吡虫啉不同施药方法对花生蛴螬的防控效果和对花生产量的影响。田间试验结果表明,用量225～420g/hm2于花生开花下针期撒施毒土,防虫效果、保果效果和有效果数增加均显著优于播种沟(穴)施药。拌种防治花生蛴螬保果效果、防虫效果和产量的增加随着拌种用药量的增加而增加,但低于播种穴施药和生长期撒施。示范试验结果验证表明:于花生开花下针期撒施毒土效果最好,用量420～630g/hm2,防虫效果、保果效果和产量增加分别为87.80%～95.12%、92.42%～95.90%和83.23%～86.61%。

Three application methods of imidacloprid with seed dressing （SD）, applying in seed furrow （SF） at planting and scattering over the field before flowering-pegging period （SO） were applied for evaluating the effects of imidacloprid on controlling peanut white grubs and yield of peanut. The results showed that SO application at 225--420g a. i./hm2 resulted in significantly better effect on fruit retention, control on grub and pod number increase than SF application at 225--420 g a. i./hm^2. Both of the SO and SF applications were better than SD application. In demonstration field trials, application of imidacloprid by SO method at 420--630 g a. i./hm2 had the best effect. The control effects of grub, protection effect on peanut and yield increase of peanut were 87.80%-- 95.12%, 92.42%--95.90% and 83.23%--86.61%, respectively, by using the SO application. These data indicated that the application of imidacloprid by SO was a practical and efficient method for control of peanut white grubs.