氮酮对杀虫剂增效作用的研究

在杀虫剂中加入氮酮,通过室内生测和田间试验,研究了其对杀虫剂的增效作用。室内生测结果表明,以粘虫为试虫,氮酮对拟除虫菊酯类杀虫剂氯氰菊酯、甲氰菊酯、三氟氯氰菊酯均有不同程度的增效作用,对有机磷类杀虫剂丙溴磷、甲基对硫磷、毒死蜱无增效作用,对敌百虫具有明显拮抗作用;以麦蚜为试虫,氮酮对吡虫啉无增效作用,对啶虫脒增效作用明显;以棉蚜为试虫,氮酮对吡虫啉和啶虫脒都有增效作用。防治棉蚜的田间药效试验表明,使用质量浓度为10,16.7,25mg/L的2.5%高渗吡虫啉乳油与使用质量浓度为33.3mg/L的5%吡虫啉乳油防效相当,结合室内生测结果,初步认为加入氮酮对2.5%高渗吡虫啉乳油有明显增效作用。

Studies on synergism of laurocapram to several insecticides

The synergism of laurocapram which mixed into several insecticides has been investigated by the bioassay and field testing.When taking the fifth instar armyworm larvae as experimental insect,the study of synergism of laurocapram indicated that laurocapram had different synergism to all tested pyrethroid insecticides,such as cypermethrin,fenpropathrin,cyhalothrin;but has no obvious synergism on organophosphate profenofos,parathion-methyl,chlorpyrifos,except trichlorphon which had antagonist apparently.The laurocapram has obvious synergism to acetaniprid,but no synergism to imidacloprid when taking Macrosiphum avenae as tested insect and it has synergism to both imidacloprid and acetaniprid when taking Aphis gossypii as treated insect.The resuls of field trials applied for Aphis gossypii showed that the efficacy of the concentration of high penetration imidacloprid 2.5% emulsifiable concentrates (EC) diluted 10,16.7,25 mg/L have no remarkable difference with that of check insecticide.According to bioassay and field test results,we obtained preliminary conclusion that laurocapram has synergism to highly penetrative imidacloprid 2.5% EC.