Pyrethrum cinerariifolium
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Last Update: 2020-11-13
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Source: Internet
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Author: User
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1 species of chrysanthemum genus
chrysanthemums
1. Origin in Europe, China's north and south parts of the provinces have cultivation. Is a perennional herb insecticidal plant, high
15
to
80
cm, the whole plant silver gray, fluffy, leaf feather-like split. Head-shaped flower sequence, edge flower for tongue-shaped flower, female, crown white, central titular flower yellow. Head sequence contains pyrethroid acetylene, B (
Pyrethrin
I. II.) and chrysanthemum acetylene, B (
cinerin
I., II.), pyrethroid beetle has the strongest insecticidal capacity,
10
times pyrethroid b. The insecticidal effect of chrysanthemum is mainly caused by paralysing the nerves of insects. In addition to chrysanthemum is harmless to birds and mammals. Generally used for mosquito repellent, is the raw material of mosquito incense. There are powders, kerosene leaching agents and emulsifying agents and other dosage forms. In addition to chrysanthemum instability, easy to hydrolysis, insecticidal powder should not survive.de-chrysanthemums like warmth, suitable for neutral soil and weak acid soil. Breeding methods are seed reproduction, branching and planting.
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