10%吡虫啉WP防治梨木虱药效试验

Field Tests on 10% Imidacloprid WP against Psylla Chinensis Yang et Li

在第2代梨木虱若虫期,用10％吡虫啉WP10 000倍、8 000倍、5 000倍、3 000倍液喷雾防治1次。药后1d的校正防效分别为89.4％、92.4％、94.0％和93.6％;药后3d的校正防效分别为86.5％、91.5％、95.7％和95.1％;药后7d的校正防效分别为92.6％、94.9％、96.8％和98.0％;药后14d的校正防效分别为77.5％、86.8％、92.2％和96.3％,均明显高于目前常用农药的防效,且对植物安全,并对害虫天敌及有益生物无不良影响。

The results of field experiment indicated that 10 % imidacloprid WP had a good effect to control Psylla Chinensis Yang et Li at nymphal stage of secondary generation. The control efficacy after one day of spray at 3 000 times, 5 000 times, 8 000 times and 10 000 times was 93.6 %, 94.0 %, 92.4% and 89.4 %, respectively. The control efficacy at the above concentration after three days of spray was 95.1 %, 95.7 %, 91. 5 % and 86.5 % , respectively . The control efficacy after seven days of spray was 98. 0%, 96. 8%, 94. 9% and 92. 6% , respectively. The control efficacy of after fourteen days of spray was 96. 3 %, 92.2 %, 86. 8 % and 77.5%, respectively. The control efficacy was better than the common pesti-cides and itis safe for plants and natural enemies.