Synthetic insecticides can affect those who use it may be teratogenic, mutagenic or carcinogenic, which is why seeking alternatives to control pests that are readily available, low cost and biodegradable as extracts from plants. In this paper the effect of aqueous extract of Chenopodium ambrosioides L. (Amaranthaceae) and neonicotinoid insecticide imidacloprid with five concentrations on adult coccinellid Cryptolaemus montrouzieri, using bottled water as a control. It was found that the aqueous extract of C. ambrosioides showed no insecticidal effect on adults of C. montrouzieri at 24h and 120h exposure, showing effect just after 144 h of exposure an LC50 of 1.4 x 103 mg•L-1, in contrast the imidacloprid presented to 24 h LC50 of 43.38 mg•L-1. Our results show that the extract of C. ambrosioides could be compatible with C. montrouzieri in integrated pest management.Keywords: chenopodium ambrosioides, Cryptolaemus montrouzieri, imidacloprid, toxicity resumen Los insecticidas sintéticos pueden afectar a quienes los usan, pues pueden ser teratogénicos, mutagénicos o carcinogénicos, es por esto que se busca alternativas para el control de plagas que sean de fácil obtención, bajo costo y sean biodegradables como los extractos provenientes de las plantas. En el presente trabajo se evaluó el efecto del extracto acuoso de Chenopodium ambrosioides L. (Amaranthaceae) y del insecticida neonicotinoide imidacloprid en cinco concentraciones sobre adultos del coccinélido Cryptolaemus montrouzieri, utilizándose agua embotellada como control. Se encontró que el extracto acuoso de C. ambrosioides no presentó efecto insecticida sobre adultos de C. montrouzieri a las 24h y 120h de exposición, mostrando recién efecto a las 144 h de exposición con una CL50 de 1,4 x 103 mg.L-1 , en cambio el Imidacloprid presentó a las 24 h una CL50 de 43,38 mg.L-1. Nuestros resultados señalan que podría ser compatible el uso del extracto de C. ambrosioides junto con C. montrouzieri en el manejo integral de plagas.
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