title: Activity and residual effect of two formulations of lambdacyhalothrin sprayed on palm leaves to Rhodnius prolixus.
abstract: The insecticidal activity and residual effect of two formulations of lambdacyhalothrin were evaluated with Rhodnius prolixus; laboratory and field tests were conducted in the State of Chiapas, Mexico. The results indicate that the lethal concentrations of the active ingredient of SC (LC50 = 2.37 and LC90 = 8.5 mg, a.i./m2) were 4-8 times than those with the insecticide WP applied on R. prolixus bugs in palm leaves, a common building material for thatched roofs. Other investigators in South America recommended applying 30 mg a.i./m2 in porous materials; we obtained that the products WP and SC were 3.5 and 16 times more effective on palm leaves. Regarding the evaluation of the residual effects in field spraying, there was up to 15 months persistence after the application of WP in two doses (8.6 mg a.i./m2 and 3.752 mg a.i./m2) with SC. We consider R. prolixus highly susceptible to the employed pyrethroids; they could be used to control this vector in the state of Chiapas, Mexico.
authors.affiliation: Facultad de Ciencias Químicas, Universidad Autónoma de Chiapas, Tapachula, Chiapas, México. mmazariego@hotmail.com
authors.forename: Miguel Angel
authors.initials: MA
authors.lastname: Mazariego-Arana
authors.forename: Eduardo
authors.initials: E
authors.lastname: Ramirez-San Juan
authors.forename: Ricardo
authors.initials: R
authors.lastname: Alejandre-Aguilar
authors.forename: Benjamín
authors.initials: B
authors.lastname: Nogueda-Torres
mesh_terms: D000818:Animals; D001681:Biological Assay; D014355:Chagas Disease / Q000517:prevention & control*; D007303:Insect Vectors / Q000187:drug effects; D007305:Insecticide Resistance; D007306:Insecticides / Q000494:pharmacology*; D008800:Mexico; D009032:Mosquito Control / Q000379:methods*; D009570:Nitriles; D011722:Pyrethrins / Q000494:pharmacology*; D011817:Rabbits; D012239:Rhodnius / Q000187:drug effects*
chemical_list: D007306:Insecticides; D009570:Nitriles; D011722:Pyrethrins; C037304:cyhalothrin