Survival, fecundity, and egg fertility of Culicoides variipennis (Diptera: Ceratopogonidae) fed on calves inoculated with ivermectin.
Female Culicoides variipennis were fed at 1-18 days postinoculation on calves treated with a commercial injectable formulation of ivermectin at the recommended rate of 200 micrograms/kg of body weight. There were no significant differences between treated and untreated animals in the survival rate of the flies at 24 h and 48 h postinoculation and the number of eggs produced per living female. There was a significantly greater mean hatch rate of eggs from flies fed on the untreated animals (65.8%) than those fed on the treated animals (52.8%). The recommended use rate of ivermectin does not appear to provide significant mortality for female C. variipennis, nor affect egg deposition or hatch rate sufficiently to reduce vector populations.
Arthropod-borne Animal Diseases Research Laboratory, Agricultural Research Service, Laramie, WY 82071-3965.
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Holbrook
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D002519:Ceratopogonidae / Q000502:physiology*; D005260:Female; D005298:Fertility / Q000187:drug effects; D006790:Host-Parasite Interactions / Q000187:drug effects; D007303:Insect Vectors / Q000187:drug effects*; D007559:Ivermectin / Q000008:administration & dosage*; D008297:Male; D010063:Ovum; D010272:Parasitic Diseases / Q000517:prevention & control; D010273:Parasitic Diseases, Animal
D007559:Ivermectin