[ Objective] In order to offer foundation for further study and exploration of the strain against pests, the pathogenicity of V. lecanfi MZ041024 strain against L. exigua was proved. [ Method] Under different spore co...[ Objective] In order to offer foundation for further study and exploration of the strain against pests, the pathogenicity of V. lecanfi MZ041024 strain against L. exigua was proved. [ Method] Under different spore concentrations of V. lecanii MZ041024 strain, the pathogenicity against 2^nd instar larvae of Laphygma exigua was determined using dipping method. [ Result ] The results showed that LC.50of V. lecanfi MZ041024 strain against 2M instar larvae of L. exigua under the concentration of 4.5 ×10^5 -4.5 ×10^8 spores/ml were 1.367×10^7, 3.245×10^6, 3.202 ×10^5 and 7.803 × 10^4 spores/ml. [ Conclusion] V. lecanfi MZ041024 strains had strong pathogenicity against L. exigua, so it had better control effect on L. exigua.展开更多
Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus...Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk展开更多
基金Supported by Fund Projects in Education Department of Yunnan Prov-ince"Species and Field Damage Law of Thripidae in Characteristics Crops in Mengzi"(08c0202)~~
文摘[ Objective] In order to offer foundation for further study and exploration of the strain against pests, the pathogenicity of V. lecanfi MZ041024 strain against L. exigua was proved. [ Method] Under different spore concentrations of V. lecanii MZ041024 strain, the pathogenicity against 2^nd instar larvae of Laphygma exigua was determined using dipping method. [ Result ] The results showed that LC.50of V. lecanfi MZ041024 strain against 2M instar larvae of L. exigua under the concentration of 4.5 ×10^5 -4.5 ×10^8 spores/ml were 1.367×10^7, 3.245×10^6, 3.202 ×10^5 and 7.803 × 10^4 spores/ml. [ Conclusion] V. lecanfi MZ041024 strains had strong pathogenicity against L. exigua, so it had better control effect on L. exigua.
文摘Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk