EFFECT AND FATE OF THE INSECT GROWTH-REGULATOR PYRIPROXYFEN AFTER APPLICATION TO THE HORN FLY (DIPTERA, MUSCIDAE)

Authors
Citation
Dl. Bull et Rw. Meola, EFFECT AND FATE OF THE INSECT GROWTH-REGULATOR PYRIPROXYFEN AFTER APPLICATION TO THE HORN FLY (DIPTERA, MUSCIDAE), Journal of economic entomology, 86(6), 1993, pp. 1754-1760
Citations number
19
Categorie Soggetti
Entomology,Agriculture
ISSN journal
00220493
Volume
86
Issue
6
Year of publication
1993
Pages
1754 - 1760
Database
ISI
SICI code
0022-0493(1993)86:6<1754:EAFOTI>2.0.ZU;2-T
Abstract
Laboratory studies demonstrated that the insect growth regulator (IGR) pyriproxyfen effectively inhibits development of the horn fly, Haemot obia 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 othe r dipterans treated with juvenile hormone analogues. Pyriproxyfen is e ffective when adult females are treated topically (LC50 = 0.96 mug per insect), adults of mixed sexes are exposed to residues on glass (LC50 = 12.83 mug/cm2), and the IGR is incorporated with the larval rearing medium (LC50 = 9.3 ppb); it was ineffective as a direct application t o eggs. Timing of treatment of adults is an important factor in their response to pyriproxyfen. Adult females are most susceptible to topica l applications on the second day after emergence; their response to re sidues on glass is minimum the first day after emergence and then incr eases significantly each day as the time of exposure increases over a 4-d period. Studies of the fate of topically applied [C-14]pyriproxyfe n in adult females demonstrated that cuticular penetration is extremel y rapid (almost-equal-to 95% in 8 h), and that relatively large propor tions of the applied concentration accumulate internally because of sl ow metabolism and excretion.