%D 2004 %0 ARTICLE %T [ Techniques of diseases , insect pests and weeds control and their efficacy in bio-rational rice production ] %J %V 15 ( 1 ) %P 111-5 %A Li B %A Shi Q %A Fang J %A Pan X %M pub15139200 %X Studies on the efficacy of bio-rational pesticides and agricultural methods against the chief diseases , insect pests and weeds of rice showed that the efficacy of the mixtures of jingangmycin and bacillus-cereus , and jingangmycin and polyoxin against rice sheath blight were 75 . 16%-94 . 27% after sprayed once at the tiller and boot end stages of rice , respectively , and better than that of chemical fungicide triadimefon . The efficacy of kasugamycin and blasticidin was 50 . 54%-72 . 67% on rice leaf blast and 76 . 66%-87 . 42% on rice head blast , and equal to the chemical fungicide tricyclazole after sprayed once at the initial stage of rice leaf blast occurrence and the initial and end stages of earing , respectively . The efficacy of bacillus thuringiensis on Chilo suppressalis and Cnaphalocrocis medinalis was better than that of chemical insecticide bisultap , and the efficacy of saponin-nicotine and matrine was equal to that of chemical insecticide bisultap when the three biorational insecticides were sprayed at 1-2 instar larvae of pests . The efficacy of saponin-nicotine and matrine was above 70% , and lower than that of chemical insecticide imidacloprid 3-30 d after sprayed at 1-2 instar larvae of Nilaparvata lugens . The occurrence of weeds could be controlled , and the rice yield could be raised when the suitable non-thorough decomposed organism was applied or weeding was carried after the field had been ploughed twice before rice transplant . The rice yield could be raised by using biorational pesticides and agricultural methods against the chief diseases , insect pests and weeds of rice . The residue of pesticides in rice was lower in the bio-control area than in the chemical control area , according with the demands of health target of green food .