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They have been used in companion planting as pest control in agricultural and garden situations, and in households. Certain plants have shown effectiveness as topical repellents for haematophagous insects, such as the use of lemon eucalyptus in PMD, but incomplete research and misunderstood applications can produce variable results. [1]
Chemical structure of Allethrin isomers Chemical structure of Permethrin isomers. A pyrethroid is an organic compound similar to the natural pyrethrins, which are produced by the flowers of pyrethrums (Chrysanthemum cinerariaefolium and C. coccineum).
Specific pest species that have been successfully controlled by pyrethrum include: potato, beet, grape, and six-spotted leafhopper, cabbage looper, celery leaf tier, Say's stink bug, twelve-spotted cucumber beetle, lygus bugs on peaches, grape and flower thrips, and cranberry fruitworm.
When present in amounts less than those fatal to insects, they still appear to have an insect repellent effect. They are harmful to fish, but are far less toxic to mammals and birds than many synthetic insecticides and are not persistent, being biodegradable and also decompose easily on exposure to light.
Citronella oil is also a plant-based insect repellent and has been registered for this use in the United States since 1948. [2] The United States Environmental Protection Agency considers oil of citronella as a biopesticide with a non-toxic mode of action. [3] Citronella oil has strong antifungal properties. [4] [5] [6]
Palmarosa oil may be an effective insect repellent when applied to stored grain and beans, [5] an antihelmintic against nematodes, [6] and an antifungal and mosquito repellent. [7] Palmarosa oil, which has a scent similar to that of roses, is added to soaps and cosmetics. [7] It is widely used for rose-smelling perfumes and cosmetics. [8]
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