Feverfew and pyrethrum are used in insecticides.
小白菊和红花除虫菊可用来制杀虫剂。
To evaluate the immune toxicity of natural pyrethrum.
目的检测天然除虫菊酯的免疫毒性。
This article draws up the pyrethrum ester insecticide.
本品是拟除虫菊酯类杀虫剂。
The output of some export crops, notably cashews, cotton, and pyrethrum, fell drastically.
有几种出口农作物，特别是腰果、棉花和除虫菊的产量大幅度下降。
The paper introduced the principle , the test conditions and the operation steps of drying the pyrethrum flower ;
本文主要介绍了除虫菊鲜花的真空冷冻干燥技术的原理、条件和操作步骤。
Pyrethrum impregnated bed nets were effective for control of malaria and it is an important measure for management of floating population.
用除虫菊酯浸泡蚊帐防治疟疾及传疟媒介获得良好效果，可作处理流动人口疟疾疫点的重要措施。
The pyrethrins are mainly synthesized in pyrethrum flowers and the content is more than 95%. The content in the dried flowers is about 1.2-2.0%.
除虫菊素主要在除虫菊花中合成，其含量占整个植株的95%以上，而干花中除虫菊素含量在1.2 - 2.0%。
Improving the content of pyrethrins in pyrethrum through genetic engineering technology is restricted, for little is known about pyrethrins-related genes.
但国内外对于天然除虫菊素合成相关基因的研究很少，从而制约了利用基因工程技术提高除虫菊花中除虫菊素的含量。
Pyrethrum possesses some ideal characteristics of environmental compatible chemical pesticide, however its photo lability and expensive price limit its broad use in the field.
天然除虫菊酯虽然具有理想化学农药的一些特性，但光不稳定性和昂贵的价格限制其大面积使用。
Extracted pyrethrins from pyrethrum dried flower by super critical CO2 . is a paste called oleoresin which isn't suitable to formulate insecticidal products either use in household or crops.
用超临界CO2从除虫菊干花中萃取的除虫菊素，这种膏状物不能直接用来加工或深加工杀虫产品。
Extracted pyrethrins from pyrethrum dried flower by super critical CO2 . is a paste called oleoresin which isn't suitable to formulate insecticidal products either use in household or crops.
用超临界CO2从除虫菊干花中萃取的除虫菊素，这种膏状物不能直接用来加工或深加工杀虫产品。
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