Pathogenicity of entomopathogenic nematodes to red imported fire ant,Solenopsis invicta Buren and the control efficacy in the field
The red imported fire ant(Solenopsis invicta Buren)is one of the most destructive invasive pests,which seriously endangers agricultural and forestry production,life and health,public safety,and ecological environment.In this study,efficacy of three entomopathogenic nematodes,Steinernema carpocapsae All,S.longicaudum X-7 and S.feltiae SN,were evaluated against S.invicta in laboratory.Moreover,the control efficacy of the selected entomopathogenic nematodes with high pathogenicity on workers in the field was investigated.The results showed that the pathogenicity of different entomopathogenic nematodes to different stages of S.invicta was significantly different.Three nematodes had high pathogenicity to S.invicta larvae,with the corrected cumulative mortality 100％three days after inoculation.The pathogenicity of the three nematodes to workers was relatively low,with the corrected cumulative mortality less than 30％ten days after inoculation.Compared with S.feltiae SN,S.carpocapsae All and S.longicaudum X-7 had stronger pathogenicity to pupae and alates,with the corrected cumulative mortality more than 90％ten days after inoculation.The field experiment showed that the control efficacy of S.carpocapsae All on the workers was up to 63.7％,and it did not increase the development of new satellite mounds.The results indicated that S.carpocapsae All and S.longicaudum X-7 were entomopathogenic nematodes with high pathogenicity.In addition,S.carpocapsae All had high control efficacy against workers of S.invicta in the field,which could be used in S.invicta biological control.
Solenopsis invictaentomopathogenic nematodespathogenicityfield control efficacy
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