title: Lack of resistance development in Bemisia tabaci to Isaria fumosorosea after multiple generations of selection.
abstract: The emergence of insecticide resistant insect pests is of significant concern worldwide. The whitefly, Bemisia tabaci, is an important agricultural pest and has shown incredible resilience developing resistance to a number of chemical pesticides. Entomopathogenic fungi such as Isaria fumosorosea offer an attractive alternative to chemical pesticides for insect control, and this fungus has been shown to be an effective pathogen of B. tabaci. Little is known concerning the potential for the development of resistance to I. fumosorosea by B. tabaci. Five generations of successive survivors of B. tabaci infected by I. fumosorosea were assayed with I. fumosorosea. No significant differences in susceptibility to I. fumosorosea, number of ovarioles, or ovipostioning were seen between any of the generations tested. Effects of I. fumosorosea and cell-free ethyl acetate fractions derived from the fungus on the B. tabaci fat body, ovary, and vitellogenin were also investigated. These data revealed significant deformation and degradation of ovary tissues and associated vitellogenin by the fungal mycelium as well as by cell-free ethyl acetate fungal extracts. These data indicate the lack of the emergence of resistance to I. fumosorosea under the conditions tested and demonstrate invasion of the insect reproductive tissues during fungal infection.
authors.affiliation: Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
authors.forename: Tianni
authors.initials: T
authors.lastname: Gao
authors.affiliation: Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
authors.forename: Zhaolei
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.
authors.forename: Yü
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Bldg. 981, Museum Rd., Gainesville, FL32611, USA.
authors.forename: Nemat O
authors.initials: NO
authors.lastname: Keyhani
authors.affiliation: Department of Entomology, College of Agriculture, South China Agricultural University, Guangzhou, 510642, China.|Department of Microbiology and Cell Science, Institute of Food and Agricultural Sciences, University of Florida, Bldg. 981, Museum Rd., Gainesville, FL32611, USA.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Huang
mesh_terms: D000818:Animals; D001203:Ascomycota / Q000472:pathogenicity*; D060467:Disease Resistance / Q000235:genetics*; D005260:Female; D006430:Hemiptera / Q000235:genetics / Q000382:microbiology* / Q000502:physiology; D008297:Male; D010053:Ovary / Q000382:microbiology / Q000502:physiology; D012098:Reproduction; D012641:Selection, Genetic