The Research Of Biopesticide Application Technique For Controlling Main Plant Diseases And Insect Pests In Rice

China is one of the biggest rice producers in the world. The rice plantingarea and whole yield on the plain of middle and lower reaches of Yangtze River occupyrespectively 27ï¼…and 29.8ï¼…of that of China. After China joined WTO, the problem thatchemical residues are excessive in rice products must be solved urgently. To developharmless farm produce and insure its safe level of sanitation, it's necessary to slice from thesource, using pesticide safely in the process of producing and decreasing chemical residues.To reduce the level of agrochemical pollution, it's important to create and develop newbio-pesticides and solve the problem of applying them.The technique of applying bio-pesticide to control main plant disease and pests isbased on protecting the stability of the agricultural ecosystem and harmonizing theanti-disease ability of eco-factors. According to the occurring trait of plant diseases andinsect pests of rice, it is required to combine bio-pesticide with agricultural controllingmeasures, choose highly effective bio-pesticide and use bio-pesticide and chemicalpesticide correctly in order to increase the efficiency of bio-pesticide and reduce the dosageof chemical pesticide.The results of bio-pesticide experiments showed that the feat dosage of 1ï¼…harpin DGwas 37.5 g/667m~2 and the control effect on Rhizoctonia solani, Pyricularia grisea andUstilaginoidea virens was 52.0ï¼…and 86.2ï¼…and 66.5ï¼…, that feat dosage of bacilluslicheniformis (10~8 cfu/ml) was 800 ml/667m~2 and the control effect on Rhizoctonia solaniand Pyricularia grisea and Ustilaginoidea virens was 61.9ï¼…and 87.6ï¼…and 74.1ï¼…, that thefeat dosage of 1.1ï¼…abamectin-azadirachtin SE was a 100 ml/667m~2 and the controlefficacy on Tryporyza incertulas and Cnaphalocrocis medinalis was 80.4ï¼…and 87.8ï¼…, thatthe feat dosage of 13.4ï¼…azadirachtin -triazophos EC was 150 ml/667m~2 and the controleffect on Tryporyza incertulas and Cnaphalocrocis medinalis was 83.6ï¼…and 92.1ï¼…, thatthe feat dosage of 10ï¼…qintaibao WP was 100 g/667m~2 and the control efficacy onTryporyza incertulas was 82.1ï¼….In the application of combined insecticide, the effect of qintaibao against Chilosuppressalis and Tryporyza incertulas was 75.5ï¼…and 80.1ï¼…, the effect of azadirachtin-triazophos against Tryporyza incertulas and Cnaphatocrocis medinalis was 79.9ï¼…and74.3ï¼…, and the effect of abamectin-azadirachtin against Tryporyza incertulas andCnaphalocrocis rnedinalis was 84.6ï¼…and 78.4ï¼…. Harpin was used at the prophase andmetaphase of rice growing phases and bacillus licheniformis at metaphase and anaphase,The effect of that against Rhizoctonia solani, Pyricularia grisea and Ustilaginoidea virenswas 64.0ï¼…, 87.8ï¼…and 68.9ï¼….The technique of controlling plant diseases and insect pests of rice at right time, using agricultural measure and the correct use of both bio-pesticide and chemical pesticide havebeen combined to establish the controlling rules which attach most importance tobio-pesticide and were demonstrated in 2005. The control effect on Chilo suppressalis andTryporyza incertulas was 91.3ï¼…and 97.1ï¼…, the control effect on Cnaphalocrocis medinaliswas 93.9ï¼…, and the control effect on Rhizoctonia solani, Pyricularia grisea andUstilaginoidea virens was 85.1ï¼…, 95.8ï¼…and 90.3ï¼…. The synthesized harm rate of diseaseand insect pests was 1.6ï¼…. 300.4 kilograms rice per 667m~2 was saved. Agricultural cost is67.85yuan RMB and net income 502.9yuan RMB. The dosage of chemical pesticide is 1.51kilograms per hectare, decreasing 88.4ï¼…compared with 2004 and the content of chemicalresidues in rice conforms to the national standard of harmless rice.The applied technique of bio-pesticide pays attention to total control of plant diseasesand insect pests, stabilizes and increases the effect of bio-pesticide, decreases the times ofusing pesticide and the dosage of chemical pesticide by over 50ï¼…. The operation of thetechnique is simple and convenient and can be mastered easily by peasants. The spread ofthis technique is of great benefit to environmental protection, reduction of chemicalresidues in rice and competition in the farm produce market. It is also active to increase theagricultural benefits and peasants' income.