title: Evaluation of a New Entomopathogenic Strain of Beauveria bassiana and a New Field Delivery Method against Solenopsis invicta.
abstract: Solenopsis invicta Buren is one of the most important pests in China, and control measures are mainly based on the use of synthetic pesticides, which may be inadequate and unsustainable. Hence, there is a growing interest in developing biological control alternatives for managing S. invicta, such as the use of entomopathogenic fungi. To facilitate the commercialization of entomopathogenic fungi against S. invicta, 10 Beauveria bassiana isolates originating from different hosts were tested for virulence in laboratory bioassays, and the most pathogenic strain, ZGNKY-5, was tested in field studies using an improved pathogen delivery system. The cumulative mortality rate reached 93.40% at 1×108 mL-1 conidia after 504 h. The germination and invasion of the spores were observed under a scanning electron microscope, and several conidia adhered to the cuticle of S. invicta after 2 h. Furthermore, the germ tubes of the conidia oriented toward the cuticle after 48 h, and the mycelium colonized the entire body after 96 h. Based on the efficacy observed in the laboratory trials, further experiments were performed with ZGNKY-5 strain to evaluate its utility in an injection control technology against S. invicta in the field. We found that three dosage treatments of ZGNKY-5 strain (500 mL, 750 mL, and 1,000 mL per nest) had significant control effects. Our results show that this strain of Beauveria bassiana and our control method were effective against S. invicta in both laboratory and field settings.
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Li
authors.affiliation: Shenzhen Wild Animal and Plant Protection Administration Agent, Shenzhen, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Guo
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Miaofeng
authors.initials: M
authors.lastname: Lin
authors.affiliation: Shenzhen Wild Animal and Plant Protection Administration Agent, Shenzhen, China.
authors.forename: Lu
authors.initials: L
authors.lastname: Jiang
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Jingwen
authors.initials: J
authors.lastname: Ye
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Dasong
authors.initials: D
authors.lastname: Chen
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Li
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Jianqing
authors.initials: J
authors.lastname: Dai
authors.affiliation: Guangdong Key Laboratory of IPM in Agriculture and Public Laboratory of Wild Animal Conservation and Utilization, Guangdong Institute of Applied Biological Resources, Guangzhou, Guangdong Province, P.R. China.
authors.forename: Shichou
authors.initials: S
authors.lastname: Han
mesh_terms: D000818:Animals; D001000:Ants / Q000382:microbiology*; D052982:Beauveria / Q000502:physiology* / Q000648:ultrastructure; D007300:Insect Control