White flower pyrethrum is in southwestern Asia; aromatic flower can be grinded into powder, can constitute the active ingredient of insecticides, called Pyrethrin or pyrethrum. Its deep rose-red large bud-shaped flower surrounds the central yellow tubular disk, and the entire flower head is born on the unbranched stem; the leaves are finely nicked. The variegated flowers of modern varieties also exhibit white, lavender and various shades of red. This flower is the body that extracts pyrethrins. The breeding of pyrethrum is not difficult, and it can be done with seeds, cuttings or ramets. It prefers well-drained, fat sandy loam. If it is under superior environmental conditions, it can grow robustly and the pyrethrin content is high.
Its insecticidal effect is generally 10 to 50 times higher than that of commonly used insecticides, and it has good quick-acting effect and strong knockdown force. For example, deltamethrin is only about 1/15 gram per acre and is one of the most potent pesticides to date. The pyrethroid molecule contains a variety of stereoisomers, and the virulence varies greatly. It is important to isolate or synthesize the highly virulence isomers.
It has good control effects on a variety of pests such as agriculture, forestry, horticulture, warehouse, animal husbandry, health, etc., including chewing mouthparts and sucking mouthparts. Early-developed varieties have poor virulence to earthworms, but some varieties that can treat ticks such as fenpropathrin, cyfluthrin, and flumethrin that can be used as acaricides have emerged. Early varieties are not toxic to fish, shellfish and crustaceans, and are not allowed to be used in paddy fields. Currently, varieties with low toxicity to fish and shrimp have been developed. For example, efenthrin and fenpropathrin can be used in rice fields.
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