Abstract:

The insecticide is comprehensively used in grain storage, as an ordinary mean to control insect pests. The resistance of insects and environmental pollution will be caused by heavily and continuously employing of chemical insecticide highly poisonous for human. The natural medical plants have strong toxic activity for stored-grain insects but have no pollution to the environment. Moreover,it is not easy to become resistible for insects. Therefore,the insecticide of medical plants have been developed and applied.