The resources of the botanical insecticides were extensively investigated, and plant samples were collected and identified in some areas of the five north-western provinces of China from May, 1989. Forty-seven of them are considered having insecticidal properties.Most of them are leguminous plants,while some species of Celastraceae and Meliaceae possess stronger insecticidal properties. The insecticidal properties of some species of plants were found by our observations or by suggestions of local farmers but not recorded in documents; the others are recorded in documents, and we also verified the properties in our investigation or got some new disco very about their activities to insect pests. The brief narrations are given in this paper about the distributions, habitats, special insecticidal characteristics of these plant species.
Journal of Gansu Agricultural University
investigation of plant resources