Effect and Fate of the Insect Growth Regulator Pyriproxyfen After Application to the Horn Fly (Diptera: Muscidae)

Authors: BULL, D. L.; MEOLA, R. W.

Source: Journal of Economic Entomology, Volume 86, Number 6, December 1993 , pp. 1754-1760(7)

Publisher: Entomological Society of America

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Laboratory studies demonstrated that the insect growth regulator (lGR) pyriproxyfen effectively inhibits development of the horn fly, Haemotobia irritans (L.). The primary IGR response elicited by pyriproxyfen-suppression of the emergence of F1 adult progeny of treated parents-is similar to that observed in comparable studies of horn flies and other dipterans treated with juvenile hormone analogues. Pyriproxyfen is effective when adult females are treated topically (LC50 = 0.96 g/ per insect), adults of mixed sexes are exposed to residues on glass (LC50 = 12.83 g/cm2), and the IGR is incorporated with the larval rearing medium (LC50 = 9.3 ppb); it was ineffective as a direct application to eggs. Timing of treatment of adults is an important factor in their response to pyriproxyfen. Adult females are most susceptible to topical applications on the second day after emergence; their response to residues on glass is minimum the first day after emergence and then increases significantly each day as the time of exposure increases over a 4-d period. Studies of the fate of topically applied [14C] pyriproxyfen in adult females demonstrated that cuticular penetration is extremely rapid (≍95% in 8 h), and that relatively large proportions of the applied concentration accumulate internally because of slow metabolism and excretion.

Document Type: Research Article

Publication date: December 1, 1993

More about this publication?
  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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