The present invention discloses a 
plant pesticide which restrains the rice blast and the application of the 
plant pesticide for restraining rice blast. The 
plant pesticide is a low-
toxicity and high-efficient novel 
biological product which is developed by using the plant of Chinese scholar tree as 
raw material. The pesticide is applied with a mode of foliage spray and can be applied to the agricultural field. The plant pesticide for restraining the rice blast according to the invention is obtained through the following steps: using the Chinese scholar tree as 
raw material, putting the 
raw material into an extraction kettle after breaking the tissue of raw material, adding the 
organic solvent with the weight of 2-3 times of the weight of raw material, immersing and extracting for 12-24 hours in the condition of 
room temperature, extracting for 2-3 times; condensing the extracted liquid to 
solid-state concentrate; dissolving the 
solid-state concentrate into the 
organic solvent with the weight of 0.5-1.5 times of the weight of 
solid-state concentrate, adding the emulsifying agent with the weight of 0.1-0.15 times of the weight of solid-state concentrate, sufficiently mixing, adding the water with the weight of 20-40 times of the weight of solid-state concentrate, and the plant pesticide aqueous 
emulsion for restraining rice blast is prepared. The plant pesticide aqueous 
emulsion for restraining rice blast can effectively restrain the 
magnaporthe grisea, increases the quality of arable farming and strengthens the capability of 
crop for resisting disasters and pests.