Efecto del paratión metílico en poblaciones del picudo del algodonero.
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Date
Authors
Gallardo, Jesús Lorea
Wolfenbarger, Dan A.
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Universidad de Costa Rica
Abstract
Description
Dosis letales medias del insecticida Paratión Metílico fueron determinadas en poblaciones de picudo del algodonero Anthonomus grandis colectadas en Río Bravo Tamaulipas, México; Tiquisate, Guatemala y Weslaco Texas E.U.A. El insecticida fue obtenido con un grado técnico de pureza de 97%, diluido con acetona y aplicado tópicamente al dorso del tórax de los insectos. Los valores DL50 de Paratión Metílico para las poblaciones de picudo de México y EUA fueron 0,0091 y 0,01 μg/picudo, respectivamente. Ambos valores indican susceptibilidad. El Valor de la DL50 para la población de picudo de Guatemala fue de 0,44 mg/picudo, que puede ser considerado como indicativo de resistencia.
LD50 of methyl parathion was determined on cotton boll weevil populations collected from Rio Bravo, Tamaulipas, Mexico, Tiquisate, Guatemala and Weslaco, Texas, E.U. The insecticide obtained as a 97% technical grade was diluted in acetone and applied topically to dorsum of thorax of the boll weevils. The LD50 values of methyl parathion on Mexico and E.U. cotton boll weevil populations were 0.0091 and 0.01 mg/weevil, respectively. Both values indicated susceptibility. Te LD50 value of methyl parathion on the Guatemala cotton boll weevil populations was 0.44 μ g/weevil. this value may be considered as indicative of resistance.
LD50 of methyl parathion was determined on cotton boll weevil populations collected from Rio Bravo, Tamaulipas, Mexico, Tiquisate, Guatemala and Weslaco, Texas, E.U. The insecticide obtained as a 97% technical grade was diluted in acetone and applied topically to dorsum of thorax of the boll weevils. The LD50 values of methyl parathion on Mexico and E.U. cotton boll weevil populations were 0.0091 and 0.01 mg/weevil, respectively. Both values indicated susceptibility. Te LD50 value of methyl parathion on the Guatemala cotton boll weevil populations was 0.44 μ g/weevil. this value may be considered as indicative of resistance.