3种植物源杀虫剂对韭菜迟眼蕈蚊的毒力测定和田间药效评价

为筛选对韭菜迟眼蕈蚊防治效果好的环境友好型杀虫剂,开展了蛇床子素、苦参碱以及印楝素3种常见植物源杀虫剂对韭菜迟眼蕈蚊的室内毒力测定和田间药效试验。结果表明,采用胃毒触杀联合毒力法,药后72 h苦参碱、印楝素、蛇床子素的LC50值分别为36.94,99.95,197.07 mg/L。田间试验中,药后21 d,0.3%苦参碱水剂3 000,2 000倍液校正防效分别为72.85%、79.54%;0.5%印楝素乳油3 000,2 000倍液校正防效分别为69.10%、76.29%;0.4%蛇床子素乳油3 750,2 500倍液校正防效分别为65.14%、70.04%。

Toxicity Determination and Control Effect of Three Botanical Pesticides Against Bradysia odoriphaga

In order to screen efficient pesticides for controlling Bradysia odoriphaga, the toxicity determination and field trials of osthol, matrine and azadirachtin were carried out. The results showed that the LC50 values of matrine, azadirachtin, osthol were 36.94, 99.95, 197.07 mg/L, respectively. On the 21st day, the control effects of matrine 0.3% AS 3000, 2000 times liquid were 72.85%, 79.54%, respectively. The control effects of azadirachtin 0.5% EC 3000, 2000 times liquid were 69.10%, 76.29%, respectively. And the control effects of osthol 0.4% EC 3750, 2500 times liquid were 65.14%, 70.04%, respectively.