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农药的混合使用,目前在病虫害化学防治上很为重要。某些农药混用可以病虫兼治、或兼治几种害虫,收效大,节省劳力,还可以防止单一用某种药剂,引起害虫再猖獗或抗药性品系的形成。 但在药剂混用的增效问题上,还存在一些含混不清的现象,有的没有单用效果的对比;有的是在单用浓度或药量的基础上另加其它药剂,虽然药效增加了,但并不能表明这就是有增效作用。增效作用应该是二种药剂单独使用的毒效总和小于混用时的毒效,所以在研究药剂混用增效问题时,应该在混合总药量与单用药量一致的情况下进行,否则不能表明混合是否有“增效作用”。 本文以晋中地区苹果天社蛾(Phalera flav-
The mixed use of pesticides is currently very important in chemical control of pests and diseases. Some pesticides can be pest control both disease and pest control, or cure several pests, large-effect, labor-saving, but also to prevent a single use of certain agents, causing pest re-rampant or resistant strains formation. However, there are still some ambiguous phenomena on the synergistic effect of mixed pharmaceuticals, and some do not have the contrast of single effects alone; while others add other medicaments on the basis of single concentration or dosage, although the efficacy is increased, But it does not indicate that this is a synergy effect. Synergism should be two kinds of agents used alone less than the combined effect of toxic effects when mixed, so in the study of pharmaceutical synergistic effect, it should be in the total mixed dose of drugs with the same single case, or can not indicate Whether there is a “synergy effect.” In this paper, Jinzhong region apple pest (Phalera flav-