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- Title
A Five-Year Study of Insecticide Resistance in Whitefly Bemisia Argentifolii Bellows & Perring from the Yaqui Valley, Mexico.
- Authors
Martínez-Carrillo, J. L.; R. Servín-Villegas; U. Nava-Camberos; Cortez-Mondaca, E.; García-Hernández, J. L.
- Abstract
A five-year study to evaluate resistance of whitefly, Bemisia argentifolii, populations to four insecticides that are commonly used in northwestern Mexico (cypermethrin, endosulfan, methamidophos, and methyl parathion) was undertaken. Whitefly populations were collected from different crops in the Yaqui Valley in Sonora. Resistance levels were obtained, comparing LC50 of field populations with a susceptible whitefly strain that was maintained free of selection pressure from insecticides for nine years. Whitefly populations have increased resistance to cypermethrin (a pyrethroid), methyl parathion and methamidophos (both organophosphates). For endosulfan (an organochlorine), no significant differences were detected. Soybean summer crops in the Yaqui Valley used to be reservoirs of susceptible whiteflies when no insecticides were used in summer season. However, current use of insecticides no longer allows alternative summer crops in this region because whitefly infestations are uncontrollable. We demonstrated that the vial technique is reliable for identifying changes in seasonal and annual susceptibility patterns in whitefly populations.
- Subjects
YAQUI River Valley (Mexico); MEXICO; INSECTICIDE resistance; ALEYRODIDAE; CROPS; PESTICIDES
- Publication
Southwestern Entomologist, 2006, Vol 31, Issue 4, p307
- ISSN
0147-1724
- Publication type
Article