Study On The Occurring Characteristics And Integrated Management Of Plant Diseases And Insect Pests In Paddy Fields In Chizhou City

Based on the monitoring datum of plant diseases and insect pests in paddy fields in Chizhou City from 2008 to 2014,the occurrence species and occurring characteristics of plant diseases and insect pests were analyzed in this paper.The main results were as follows:There were more than 50 species of plant diseases and insect pests in paddy fields in Chizhou city.Among which there were more than 20 species of plant diseases and 30 species insect pests.The moderate-level plant diseases were rice stripe blight,rice brown spot,rice kernel smut,rice bakanae disease and rice black streaked dwarf disease.The major dominant plant diseases were rice sheath blight,rice blast and rice false smut.The moderate-level insect pests were white-backed rice planthopper,grey rice planthopper and rice green caterpillar.The major dominant insect pests were rice stem borer,rice leaf roller,brown rice planthopper and rice thrip.Since 2008,the occurrence time of rice planthopper has been postponed year by year,and the population of-rice leaf roller and the population of rice stem borer were higher-level.Rice sheath blight mainly occured after booting stage in paddy fields,which has the hightst occurrence rate at filling stage.Rice leaf blast was mainly type among rice blast in paddy fields,and incidence rate and disease grade were also increasing year by year.A series of chemical-agent field experiments were made and the results show that:60 g/L spinetoram suspension concentrate had significant control effect on rice thrip,abamectin microemulsion had better control effect on rice leaf roller,60%nitenpyram and dinotefuran water dispersible granule had better control effect on rice planthopper,24%thifluzamide suspension concentrate and 24%hexaconazole and azoxystrobin suspension concentrate had better control effect on rice sheath blight,40%isoprothiolane emulsifiable concentrate had better control effect on rice leaf blast,325g/L difenoconazole and azoxystrobin suspension concentrate and 75%trifloxystrobin and tebuconazole water dispersible granules had better control effect on plant diseases at rice panicle stage.