High level methoprene resistance in the mosquito Ochlerotatus nigromaculis (Ludlow) in central California.
Pest Manag Sci
; 58(8): 791-8, 2002 Aug.
Article
en En
| MEDLINE
| ID: mdl-12192903
ABSTRACT
In the summer of 1998, failures of methoprene field applications to control the mosquito Ochlerotatus nigromaculis (Ludlow) were noticed in several pastures in the outskirts of Fresno, California, USA. Effective control with methoprene had been achieved for over 20 years prior to this discovery. Susceptibility tests indicated that the Fresno Oc nigromaculis populations had developed several thousand-fold higher LC50 and LC90 tolerance levels to methoprene compared with methoprene-naïve populations. The synergists piperonyl butoxide (PBO), S,S,S-tributyl phosphorotrithioate and 3-octylthio-1,1,1-trifluoro-2-propanone had little synergistic effect, suggesting that the mechanism of methoprene tolerance was not mediated by P450 monooxygenase or carboxylesterase enzyme degradation. As part of initiating a resistance management strategy, partial reversion back to methoprene susceptibility was achieved in a resistant population after six consecutive applications of Bacillus thuringiensis israelensis Goldberg & Marga coupled with two oil and two pyrethrum + PBO applications.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Resistencia a los Insecticidas
/
Agricultura
/
Metopreno
/
Culicidae
Límite:
Animals
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Pest Manag Sci
Asunto de la revista:
TOXICOLOGIA
Año:
2002
Tipo del documento:
Article
País de afiliación:
Estados Unidos