不同剂型异丙威对稻飞虱的防治效果

Control Effects of Different Isoprocarb Formulations against Rice Planthopper

通过田间药效比较试验,评价了异丙威两种单剂和两种复配制剂对湖南晚稻稻飞虱的防治效果。结果表明：25%噻嗪酮.异丙威WP药剂防治稻飞虱效果最优,3个不同浓度处理药后3、7 d校正防效均在90%及以上,药后14 d中高浓度处理防效在80%及以上,这说明25%噻嗪酮.异丙威WP药剂防治稻飞虱既具有较好的速效性,也具有较好的持效性,可作为若虫期防治稻飞虱的理想药剂,推荐使用浓度为1 875~2 250 g/hm2。10%吡虫啉.异丙威WP 1 500 g/hm2处理药后3、7 d校正防效分别为84.4%、88.8%,药后14 d校正防效达80.2%,也表现出良好的持效性;为避免长期施用单一药剂使得稻飞虱产生相应抗药性,该药剂可与25%噻嗪酮.异丙威WP轮换使用,推荐使用浓度为1 500 g/hm2。

Control effects of two pure isoprocarb formulations and two compounded isoprocarb formulations on rice planthopper for late rice in Hunan Province were evaluated through field efficacy trials.The results showed that 25% Buprofezin·isoprocarb WP had the best control effect on rice planthopper,its corrected control efficiencies of three treatments with different concentrations were all over 90% at 3 and 7 days after application,and its control efficiencies of treatments with medium and high concentration were over 80% at 14 days after application,so the 25% Buprofezin·isoprocarb WP,which has better quick action effect and lasting effect,can be ideal pesticide for controlling rice planthopper in nymphal stage,and its recommended applying concentration is 1 875~2 250 g/hm2;the corrected control efficiencies of 10% Imidacloprid·isoprocarb WP with concentration of 1 500 g/hm2 at 3,7 and 14 days after application were 84.4%,88.8% and 80.2% respectively,so 10% Imidacloprid·isoprocarb WP also showed a great lasting effect.To avoid rice planthopper developing a resistance to 25% Buprofezin·isoprocarb WP and 10% Imidacloprid·isoprocarb WP for long-term application of single pesticide,the 10% Imidacloprid·isoprocarb WP can be applied rotationally with 25% Buprofezin·isoprocarb WP,and its recommended concentration is 1 500 g/hm2.