The Effects Of Insecticides And Antiviral Agents On Wing Dimorphisim, Development And Reproduction Of Aphids

Viral diseases are important diseases on vegetable cultivation, seriously affecting the yield and quality of vegetables, restricting the development of vegetable industry. Myzus persicae and Lipaphis erysimi are two important pests on vegetables, not only injuring plant by direct feeding, but also causing the spread of a large number of non-persistent viruses, resulting in enormous losses. The use of insecticides and antiviral agents can effectively control the number of aphids and prevent viral diseases. Therefore, the interaction among insecticides(antiviral agents)-aphids–viruses determines the occurrence and spread of virus diseases in vegetables field, and better understanding of the relationship among the above three aspects will help us to develop prevention strategies. We studied the influence of several insecticides and antiviral agents on wing dimorphism, development and reproduction of Myzus persicae and Lipaphis erysimi in indoor conditions. Specific results are as follows: 1Effects of sublethal concentration of insecticides on wing dimorphism,development and reproduction of aphidsToxicity of seven insecticides to two kind of aphids is measured by using leaf immersion experiment and the sublethal concentrations LC10 are calculated, we have evaluated seven insecticides on wing dimorphism, development and reproduction of aphids with the clip-cage method. The results are as follows: at 20 ℃, nitenpyram extended developmental duration of Myzus persicae; thiacloprid significantly reduced the number of offspring produced by Myzus persicae.At 25 ℃, thiacloprid significantly reduced the percentage of winged offspring produced by Lipaphis erysimi; thiacloprid, imidacloprid,avermectin and nitenpyram extended developmental duration of Lipaphis erysimi; thiacloprid, avermectin, acetamiprid, nitenpyram and thiamethoxam significantly reduced the number of offspring produced by Lipaphis erysimi. 2 Effects of antiviral agents on wing dimorphism, development and reproduction of aphidsSeven kinds of antiviral agents have no lethal effect on Myzus persicae and Lipaphis erysimi. Seven antiviral agents have no significant positive or negative effects on wing dimorphism of Myzus persicae F1 generations. At 20 ℃, Amino Oligosaccharins significantly increased the proportion of winged aphids in F1 generations of Lipaphis erysimi, but the opposite happens, Amino Oligosaccharins ·Chain protein significantly reduced the proportion of winged aphids in F1 generations of Lipaphis erysimi; amino oligosaccharins and amino Oligosaccharins· Chain protein shortened the development duration of Myzus persicae, moroxydine hydrochloride extended the developmental duration of Lipaphis erysimi; Moroxydine copper acetate increased the number of offsprings produced by Myzus persicae; Moroxydine copper acetate, ningnanmycin and lentinan significantly increased the number of offsprings produced by Lipaphis erysimi. At 25 ℃, ningnanmycin and moroxydine hydrochloride decreased the proportion of winged aphids in F1 generations of Lipaphis erysimi; amino Oligosaccharins Chain protein and moroxydine hydrochloride extended the developmental duration of Myzus persicae; ningnanmycin and lentinan significantly shortened the developmental duration of Lipaphis erysimi, but moroxydine hydrochloride extended the developmental duration of Lipaphis erysimi; glucosan decreased the number of offsprings produced by Lipaphis erysimi.