Wheatgrass Early Extracts Of M. Persicae Biological Activity And Enzyme Activity Impact

The research of pesticidal activities and mechanical toxicology about extracts from Agropyroh cristatus (L.) Gaertn against Myzus persicae (Sulzer) Abstract Agropyroh cristatus (L.) Gaertn is one of the important grazing in the world. With the aim of searching for novel class of insecticidal plant, we have done a set of experiments on different extracts from Agropyroh cristatus (L.) Gaertn against Myzus persicae (Sulzer). This study includes pesticidal activities and mechanical toxicology. Chloroform extract and water extract from Agropyroh cristatus (L.) Gaertn have stronger activities among the four different extracts. The death rate of Myzus persicae reaches 96% and 95% after 48h treated by sucking, and 71% and 71.2% after 24h treated by contacting respectively. Their LC5Os are 2.7mg/mi and 5.9mg/mi after 48h treated by sucking, and 6.4mg/mi and 5.9mg/mi after 24h treated by contacting respectively. The primary research about mechanical toxicology indicate that chloroform extract and water extract have strong restrain action treated by sucking and enabled action treated by contacting to Protease. These two extracts have notable restrain action treated by sucking and little effects treated by contacting to GSTs. The esterase isozyme affected by extracts has the trend that straps of main enzyme have been restrained and straps of coenzyme increased, except contacting treatment treated by water extract. These two extracts also have some effects on AchE treated by sucking, while little effect in contacting treatment. In this thesis, the extracts from Agropyroh cristatus's killing manner, mechanical toxicology, application were discussed.