The Study On Acaricide Activation Of Eupatorium Adenophorum

Indoors experiments on the contact toxicity and anti-feedant activity of several crude extracts from plant such as Eupatorium adenophorum Spreng, Sophora flavescens Ait., Melia toosendan Sieb. Et Zucc, Derris elliptica and Leonurus heterphyllus sweet to Tetranykhus ucticae Kach and Panoychus cotri, were made. Regression and correlation analysisi results showed that there was a significant or extreme significant correlation between treatment concentrations and the contact tocicity and anti-feedant activity against the two mites. At the same time, the crude extract from Eupatorium adenophorum Spreng possessed the most strong contact toxicity and anti-feedant activity to Tetranykhus ucticae Kach and Panoychus cotri by DMRT, when diluted 1000 time the contact toxicity reached 73.53% to Tetranykhus ucticae Kach, 29.17% to Panoychus cotri, 24 hours after treatment. And the crude extract from Eupatorium adenophorum Spreng posed strong contact toxicity to Tetranykhus egg. The extraction and separation of alkaloids from Eupatouium adenophorum by continuous extraction are described. Then quantity analysis is carried by UV method. Field experiments showed that the extracts from Eupatorium adenophorum Spreng were highly effectly for the control of Panonychus citri. In this paper, the safety of alcoholic Extracts of Eupatorium adenophorum Spreng was evaluated. The acute oral toxicity, the acute eye and dermal irritation of toxicity were tested. The result showed that the LD50>5000mg/kg of Extracts of Eupatorium adenophorum Spreng for mouse by oral administration. The irritation on eyes and dermal were negative. And there was not significantdifference between the experimental groups and the control group in micronucleus assay and sperm shape abnormality.