Discuss On The Possibility And Earlier Experimental Study Of Asarum Siebuldii As The Termicides

Termites blazoning in the temperate zone and the torrid zone is a kind of high-harmful society insect. The harmfulness caused by termites is terribly rampant in the southward of China. It was estimated that the economic expense caused by termites is approximately one billion RMB in Hubei and Guangdong provinces every year. In our country, the termicides often used include arsenicals, organchlorine compounds, organophosphates, and so on.Because the chemical termicides are highly harmful to the environment and human health, many countries have already stopped using them. However, there are no other replacers for the current chemical termicides in China. Lately, researchers have paid attention to the botanical insecticides that are high-effective, !ow-toxic, high-selectivity and not pollutive.Asarum is an efficacious traditional Chinese medicine. However, the toxicity of Asarum seriously restricts its clinic application. From of old, Chinese people have used Asarum to drive away insects. In Chinese southward, people have spreaded Asarum grass below the floor board to drive termites. In order to explore the possibility of Asarum as the termicides, this paper has studied on the toxic effects of Asarum heterotropoides Fr. Var. mandshuricum (Maxim.) kitag. against Reticulitermes flaviceps, discussed the active ingredients ngainst termites and mensurated its content. Moreover, we have evaluated the security of the active group. The results showed that: 1)Asarum naphtha has good repellent and suffocating activity against Reticulitermes flaviceps, and Methyleugenol is the active substance of its suffocating activity; (2)the ethanol extraction of Asarum has the definite contacting toxicity, and Asarinin is the active substance of its contacting toxicity; (3) the Asarinin content...