pyrethrum

简明释义

英[paɪˈriːθrəm]美[paɪˈriːθrəm]

n. [农药] 除虫菊；除虫菊杀虫剂

复 数 p y r e t h r u m s

英英释义

单词用法

同义词

反义词

例句

1.This article draws up the pyrethrum ester insecticide.

本品是拟除虫菊酯类杀虫剂。

2.To evaluate the immune toxicity of natural pyrethrum.

目的检测天然除虫菊酯的免疫毒性。

3.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%。

4.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。

5.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。

6.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。

7.Some people may have allergic reactions to pyrethrum when used in home pest control.

一些人在家庭灭虫时使用除虫菊可能会出现过敏反应。

8.The gardener used pyrethrum to effectively control the aphid population in his roses.

园丁使用了除虫菊来有效控制玫瑰上的蚜虫数量。

9.Before applying pyrethrum, make sure to read the instructions carefully.

在使用除虫菊之前，请确保仔细阅读说明书。

10.The use of pyrethrum has been shown to reduce pest populations without harming beneficial insects.

使用除虫菊已被证明可以减少害虫数量，而不会伤害有益昆虫。

11.Many organic farmers prefer pyrethrum because it is a natural insecticide.

许多有机农民更喜欢使用除虫菊，因为它是一种天然的杀虫剂。

作文

In the world of agriculture and pest control, the term pyrethrum refers to a natural insecticide derived from the flowers of certain species of chrysanthemum. This remarkable compound has gained popularity due to its effectiveness in managing pests while being relatively safe for humans and the environment. The use of pyrethrum can be traced back to ancient times when farmers discovered that the crushed flowers could repel insects. Today, it is widely used in both commercial and home gardening practices.One of the key reasons for the popularity of pyrethrum is its fast-acting nature. When insects come into contact with this substance, it affects their nervous system, leading to paralysis and eventual death. This quick action makes pyrethrum an attractive option for those looking to control pest populations without resorting to synthetic chemicals that may have harmful side effects. Furthermore, pyrethrum breaks down quickly in the environment, reducing the risk of long-term ecological damage.Farmers often prefer pyrethrum because it targets a wide range of pests, including aphids, beetles, and moths, making it a versatile tool in integrated pest management strategies. Additionally, it is commonly used in household products such as bug sprays and pet shampoos, allowing homeowners to combat infestations effectively and responsibly. The organic nature of pyrethrum also appeals to those who are conscious about using chemical-free products in their homes and gardens.Despite its many benefits, it is essential to use pyrethrum responsibly. While it is considered safe for most beneficial insects, such as bees and ladybugs, it can still pose a risk if applied indiscriminately. Therefore, users must follow label instructions carefully and apply it during times when beneficial insects are less active, such as early morning or late evening. This approach helps minimize the impact on non-target species and ensures that the ecosystem remains balanced.Moreover, resistance to pyrethrum can develop in certain pest populations over time, which can reduce its effectiveness. To combat this issue, it is advisable for farmers and gardeners to rotate different types of pest control methods and incorporate cultural practices that promote healthy plant growth. This strategy not only helps manage pest populations but also supports the overall health of the garden or farm.In conclusion, pyrethrum is a valuable tool in the realm of pest control, offering a natural and effective solution for managing insect populations. Its history as a traditional remedy combined with modern agricultural practices demonstrates its versatility and importance in sustainable farming. By understanding the proper use and potential limitations of pyrethrum, individuals can harness its benefits while protecting the environment and promoting biodiversity in their gardens and farms. As we continue to seek sustainable solutions for pest management, pyrethrum will undoubtedly remain a key player in the ongoing effort to balance agricultural productivity with ecological responsibility.

在农业和害虫控制的世界中，术语pyrethrum指的是一种天然杀虫剂，来源于某些菊花种类的花朵。这种非凡的化合物因其有效管理害虫的能力而受到欢迎，同时对人类和环境相对安全。使用pyrethrum的历史可以追溯到古代，当时农民发现将花朵压碎后可以驱赶昆虫。如今，它广泛用于商业和家庭园艺实践中。pyrethrum受欢迎的一个关键原因是它的快速作用。当昆虫接触到这种物质时，它会影响它们的神经系统，导致瘫痪并最终死亡。这种迅速的效果使得pyrethrum成为那些希望控制害虫数量而不依赖于可能有害副作用的合成化学品的人的理想选择。此外，pyrethrum在环境中迅速分解，减少了长期生态损害的风险。农民通常更喜欢使用pyrethrum，因为它可以针对多种害虫，包括蚜虫、甲虫和蛾子，使其成为综合害虫管理策略中的多功能工具。此外，它还常用于家庭产品，如杀虫喷雾和宠物洗发水，使房主能够有效且负责任地对抗侵扰。pyrethrum的有机特性也吸引了那些关注在家中和花园中使用无化学产品的人。尽管有许多好处，但使用pyrethrum时必须负责任。虽然它被认为对大多数有益昆虫（如蜜蜂和瓢虫）是安全的，但如果不加区别地施用，仍然可能构成风险。因此，用户必须仔细遵循标签说明，并在有益昆虫活动较少的时间施用，例如清晨或傍晚。这种方法有助于最小化对非目标物种的影响，并确保生态系统保持平衡。此外，某些害虫种群可能会随着时间的推移对pyrethrum产生抗药性，这可能降低其有效性。为了解决这个问题，建议农民和园丁轮换不同类型的害虫控制方法，并结合促进植物健康生长的文化实践。这种策略不仅有助于管理害虫数量，还支持花园或农场的整体健康。总之，pyrethrum是害虫控制领域中的一项宝贵工具，提供了一种自然有效的解决方案来管理昆虫种群。作为一种传统疗法的历史与现代农业实践相结合，展示了其多功能性和可持续农业的重要性。通过了解pyrethrum的正确使用和潜在限制，个人可以利用其好处，同时保护环境，促进花园和农场的生物多样性。在我们继续寻找可持续的害虫管理解决方案的过程中，pyrethrum无疑将在平衡农业生产力与生态责任的持续努力中扮演关键角色。