Interactions between Entomopathogenic Fungus, Metarhizium anisopliae and Sublethal Doses of Spinosad for Control of House Fly, Musca domestica

  • M Sharififard Mail Department of Medical Entomology, College of Health, Ahvaz Jundishapur University of Medical Sciences, Iran
  • MS Mossadegh Department of Plant Protection, College of Agriculture, Shahid Chamran University, Ahvaz, Iran
  • B Vazirianzadeh Department of Medical Entomology and Infectious and Tropical Diseases Research Center, Ahvaz Jundishapur University of Medical Science, Iran
  • A Zarei-Mahmoudabadi Department of Mycoparasitology and Infectious and Tropical Diseases Research Center, Ahvaz Jundishapur University of Medical Science, Iran
Metarhizium anisopliae, Musca domestica, spinosad, Iran,


Background: Metarhizium anisopliae strain IRAN 437C is one of the most virulent fungal isolates against house fly, Musca domestica. The objective of this study was to determine the interaction of this isolate with sublethal doses of spino­sad against housefly.Methods: In adult bioassay, conidia of entomopathogenic fungus were applied as inoculated bait at 105 and 107 spore per gram and spinosad at 0.5, 1 and 1.5 µg (A.I.) per gram bait. In larval bioassay, conidia were applied as combina­tion of spore with larval bedding at 106 and 108 spore per gram and spinosad at sublethals of 0.002, 0.004 and 0.006 µg (AI) per gram medium.Results: Adult mortality was 48% and 72% for fungus alone but ranged from 66–87% and 89–95% in combination treat­ments of 105 and 107 spore/g with sublethal doses of spinosad respectively. The interaction between 105 spore/g with sublethals exhibited synergistic effect, but in combination of 107 spore in spite of higher mortality, the interac­tion was additive. There was significant difference in LT50 among various treatments. LT50 values in all combination treat­ments were smaller than LT50 values in alone ones. Larval mortality was 36% and 69% for fungus alone but ranged from 58%–78% and 81%–100% in combination treatments of 106 and 108 spore/g medium with sublethals of spino­sad respectively. The interaction was synergistic in all combination treatments of larvae.Conclusion: The interaction between M. anispliae and spinosad indicated a synergetic effect that increased the house fly mortality as well as reduced the lethal time.   


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How to Cite
Sharififard M, Mossadegh M, Vazirianzadeh B, Zarei-Mahmoudabadi A. Interactions between Entomopathogenic Fungus, Metarhizium anisopliae and Sublethal Doses of Spinosad for Control of House Fly, Musca domestica. J Arthropod Borne Dis. 5(1):28-36.