天然苦皮藤素和天然除虫菊素混配对三种蚜虫的毒力及田间防效

The toxicity and field effect of natural celangulins and cypermethrins mixture on three aphids

用禾谷缢管蚜、萝卜蚜和绣线菊蚜测定了苦皮藤素与除虫菊素混配的联合毒力,结果表明：天然苦皮藤素与天然除虫菊素在20∶1到1∶20测定范围内复配使用的共毒系数在136.7～261.2之间,均表现出增效作用.当天然苦皮藤素与天然除虫菊素质量比为4∶1时,对禾谷缢管蚜、萝卜蚜和绣线菊蚜的联合增效作用最为显著,共毒系数分别为257.3、261.2和246.8.田间药效试验结果表明,按最佳配比复配使用,对三种蚜虫的防治效果也显著高于相同剂量下单剂的防治效果.

The common toxicities of the mixtures in plant extracts from Celastrus angulatus Max.and Pyrethrum cinerariifolium on Rhopalosiphum padi （Linnaeus）,Lipaphis erysimi （Kaltenbach） and Aphis citricola van der Goot were studied.The results showed that the mixtures of C.angulatus and P.cinerariifolium in the ratios of 20∶ 1-1∶20 had remarkable synergistic effects,and the common toxicity coefficients （CTC） were 136.7-261.2.The mixtures of C.angulatus and P.cinerariifolium in a ratio of 4∶ 1 had the most significant synergistic effects against the three aphids,and the CTCs were 257.3,261.2 and 246.8,respectively.Field efficacy test results showed that the efficacy in the optimum ratio was significantly higher than that with single agents of the same doses against the three aphids.