Main Species And Control Strategy Of Insect Pests Happened On Cruciferae Vegetables In ChongZuo City

dynamic state of main insect pests on cruciferae vegetables cultivated in the open air in part of vegetable base in the suburbs of ChongZuo city and the research results of control effect of low-toxic biocides screened out against main insect pests were reported in this thesis.The main results were as follows:1,the species of insect pests on the main Cruciferae vegetables in part of vegetable base in the suburbs of ChongZuo city found in recent years were 8 orders,18 families and 41 species,including Orthoptera 2 families 2species,Homoptera 3 families 6 species,Hemiptera 1 family 3species, Thrips 1 family 1 species,Coleoptera 3 families 7 species,Lepidoptera 7 families 17 species,Diptera 2 families 4 species,Hymenoptera 1 family 1 species,Snail 2 species,Amphioxus 2 species and Subulinidae 1 species.In which 8 species were main insect pests happened seriously each year, including Plutella xylostella Linné(Lepidoptera,Plutellidae),Spodoptera litura,Spodoptera exigua(Hubner)(Lepidoptera,Noctuidae),Pieris rapae crucivora Boisduval(Lepidoptera,Preridae)Phyllotreta striolata Fabricus(Coleoptera,Chrysomelidae),Myzus persicae Sulzer,Lipaphis erysimi Kaltenbach and Brevicoryme brassicae Linné(Homoptera, Aphididae)。 2,The control effect of 15%triazophos·abamectin CE 750mL/ha on Plutella xylostella Linnéwhen sprayed insecticide at the peak period of occurrence were 83.69%3 days later and 91.12%7 days later respectively. The control effect of 15%triazophos.abamectin CE 750mL/ha on Pieris rapae crucivora Boisduval when used At the peak period of occurrence were 82.26%after 3 days and 92.04%after 7 days respectively.the control effect of it was better than that of 1.0%abamectin EC,and as good as that of 20% triazophos EC with normal dosage.It was safe to vegetables.3,The control effect of 5%fipronil SE 20mL+2.5%deltamethrin EC 30mL per mu on Plutella xylostella Linnéand Spodoptera exigua(Hubner) was beyond 80%.4,The dosage of abamectin+fipronil used to control Plutella xylostella Linnéwas 240 ml/ha +300 ml/ha.The dosage of abamectin+fipronil used to control Pieris rapae crucivora Boisduval was 180 ml/ha +225 ml/ha.5,1.8%ivermectin and 1.8%abamectin also had good control effect on Plutella xylostella Linnéin the field.Average Revised control effects of them at the concentration of 6 mg/L were 94.92%and 97.26%respectively after 4 days,with Average Revised control effect of 83.64%and 89.00% respectively after 7days.Average Revised control effects of them at the concentration of 9 mg/L on high-instar larve of Liriomyza sativae Blanchard were 72.18%and 51.48%respectively after 3 days.But the Average Revised control effects of them on low-instar larve were 81.55%and 68.43% respectively.The effecst of protecting leaves of high part,middle partand low part of plant at the 7th day after spraying ivermectin were 83.46%,67.85% and 42.90%respectively,the average was 58.22%.The effecst of protecting leaves after spraying abamectin were 41.69%,45.93%and 43.83% respectively,the average was44.46%.Control effect and protectind leaves effect of ivermectin on Plutella xylostella Linnéand Liriomyza sativae Blanchard were better than that of abamectin.