pyrethrins

简明释义

英[paɪˈrɛθrɪnz]美[paɪˈrɛθrɪnz]

n. 除虫菊素；[农药] 除虫菊酯；除虫菊精

英英释义

单词用法

同义词

反义词

例句

1.Nearly 90% of exposures involved insecticides containing pyrethroids, pyrethrins or both.

将近90%的杀虫剂都含有除虫菊酯或者虫菊酯或者兼而有之。

2.The invention provides natural pyrethrins pollen and the preparation method thereof.

本发明为天然除虫菊素花粉剂及制备方法。

3.Conclusion Pyrethrins aerosol was safe for use and had high efficacy. It should be generalized.

结论天然除虫菊素杀虫气雾剂具有安全，高效等特点，值得推广应用。

4.To study oxidative damage of II-Pyrethrins on brains of mice and the mechanism of its toxic effect.

探索II -型拟除虫菊酯类农药对小鼠脑的氧化损伤作用及其毒理作用机制。

5.Objective To observe the efficacy of pyrethrins aerosol against cockroaches by bioassay.

目的通过生物测试，观察天然除虫菊素杀虫气雾剂对蟑螂的药效。

6.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。

7.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%。

8.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。

9.The gardener used a spray containing pyrethrins to eliminate the aphid infestation on his roses.

园丁使用含有除虫菊素的喷雾消灭了玫瑰上的蚜虫侵扰。

10.Organic farmers often prefer pyrethrins because they are derived from natural sources.

有机农民通常更喜欢除虫菊素，因为它们源自天然来源。

11.Pets should be kept away from areas treated with pyrethrins until the product has dried.

在产品干燥之前，宠物应远离使用除虫菊素处理过的区域。

12.Before applying pyrethrins, make sure to read the instructions carefully.

在使用除虫菊素之前，请确保仔细阅读说明。

13.Many household insecticides are formulated with pyrethrins for their effectiveness against common pests.

许多家庭杀虫剂都以除虫菊素为成分，因其对常见害虫的有效性。

作文

In the realm of pest control, there are many substances that have been utilized over the years to manage unwanted insects. One such substance is pyrethrins, a natural insecticide derived from the flowers of the chrysanthemum plant. The use of pyrethrins has gained popularity due to its effectiveness and relatively low toxicity to humans and pets compared to synthetic alternatives. This essay will explore the origin, application, benefits, and potential drawbacks of pyrethrins in pest management.Pyrethrins are extracted from the dried flower heads of the Chrysanthemum cinerariifolium and Chrysanthemum coccineum plants. These compounds work by disrupting the nervous system of insects, leading to paralysis and death. The mechanism of action involves affecting the sodium channels in the insect's neurons, which causes an overload of signals and ultimately results in the insect's demise. This natural origin is one of the reasons why pyrethrins are favored by many who seek environmentally friendly pest control solutions.The application of pyrethrins is versatile; it can be used both indoors and outdoors. Gardeners often utilize pyrethrins to protect their plants from a variety of pests, including aphids, beetles, and caterpillars. Homeowners may also apply pyrethrins to manage household pests such as ants, roaches, and mosquitoes. The ease of application, whether through sprays or granules, makes pyrethrins accessible for both professional pest control services and DIY enthusiasts.One of the significant benefits of using pyrethrins is its rapid action. Insects exposed to pyrethrins typically show signs of distress within minutes, making it an effective choice for immediate pest control needs. Additionally, pyrethrins break down quickly in the environment, which minimizes the risk of long-term ecological impact. This characteristic aligns with the growing consumer demand for sustainable and less harmful pest control methods.However, it is essential to acknowledge that pyrethrins are not without their drawbacks. While they are less toxic to humans and pets than many synthetic pesticides, they can still pose risks if misused. Overexposure can lead to symptoms such as headaches, nausea, and respiratory issues. Furthermore, some beneficial insects, such as bees and butterflies, can be adversely affected by pyrethrins if applied during their active hours. Therefore, it is crucial to follow label instructions carefully and apply pyrethrins at times when non-target species are less likely to be present.Another concern is the potential for insect resistance. Similar to other insecticides, repeated use of pyrethrins can lead to the development of resistant insect populations. To combat this issue, integrated pest management (IPM) strategies are recommended, which involve rotating different types of pest control methods to reduce the likelihood of resistance.In conclusion, pyrethrins represent a valuable tool in the arsenal of pest control options available today. Their natural origins, rapid action, and lower toxicity make them an attractive choice for many gardeners and homeowners. However, responsible use is paramount to mitigate any potential risks to human health and the environment. By understanding both the benefits and limitations of pyrethrins, individuals can make informed decisions about their pest management strategies, contributing to a healthier and more sustainable ecosystem.

在害虫控制领域，多年来已经使用了许多物质来管理不必要的昆虫。其中一种物质是除虫菊素，这是一种从菊花植物的花中提取的天然杀虫剂。由于其有效性和相对于合成替代品较低的对人类和宠物的毒性，除虫菊素的使用越来越受到欢迎。本文将探讨除虫菊素的起源、应用、益处和潜在缺点。除虫菊素是从千层金和红色千层金植物的干花头中提取的。这些化合物通过干扰昆虫的神经系统来发挥作用，导致麻痹和死亡。其作用机制涉及影响昆虫神经元中的钠通道，从而导致信号过载，最终导致昆虫的死亡。这个天然来源是许多人选择除虫菊素作为环保害虫控制解决方案的原因之一。除虫菊素的应用非常灵活；它可以在室内和室外使用。园丁们常常利用除虫菊素保护他们的植物免受各种害虫的侵害，包括蚜虫、甲虫和毛虫。房主也可以使用除虫菊素来管理家庭害虫，如蚂蚁、蟑螂和蚊子。无论是喷雾还是颗粒，除虫菊素的易用性使其对专业害虫控制服务和DIY爱好者都很方便。使用除虫菊素的一个显著好处是其快速作用。接触到除虫菊素的昆虫通常在几分钟内表现出痛苦的迹象，这使其成为满足即时害虫控制需求的有效选择。此外，除虫菊素在环境中迅速降解，这最小化了长期生态影响的风险。这一特性与消费者日益增长的对可持续和危害较小的害虫控制方法的需求相一致。然而，必须承认除虫菊素并非没有缺点。虽然与许多合成杀虫剂相比，它们对人类和宠物的毒性较低，但如果误用仍然可能造成风险。过度暴露可能导致头痛、恶心和呼吸问题。此外，一些有益昆虫，如蜜蜂和蝴蝶，如果在它们活跃的时间施用除虫菊素，也可能受到不利影响。因此，遵循标签说明并在非目标物种不太可能出现的时间施用除虫菊素至关重要。另一个问题是昆虫抗药性的潜在性。与其他杀虫剂类似，重复使用除虫菊素可能导致抗药性昆虫种群的发展。为了解决这个问题，建议采用综合害虫管理（IPM）策略，其中包括轮换不同类型的害虫控制方法，以减少抗药性的可能性。总之，除虫菊素代表了当今可用的害虫控制选项中一种有价值的工具。它们的天然来源、快速作用和较低毒性使其成为许多园丁和房主的吸引选择。然而，负责任的使用至关重要，以减轻对人类健康和环境的潜在风险。通过理解除虫菊素的优缺点，个人可以就其害虫管理策略做出明智的决定，为更健康和可持续的生态系统作出贡献。