The population distribution of Oulema oryzae is researched, the results are as follows: The population distribution is similar to the parabolic model ; Larvae high appearing is in the later June ;significant positive correlation exist between population density and rice yield losing ratio :By population 300,the yield of rice reduces obviously ;Index of chemical controls is 92.

Conprehensive evaluation of the control effect of rice pest on confidor and pronil;

Prediction model for rice stem borer based on L-M optimized algorithm and its preliminary application;

The field trial results shows that buprofezin & monosultap is as well as methamidaphos to control the three main rice pest of rice leaf folder, rice planthoppers and yellow stem borer and it is few harmful to beneficial populations in rice field.