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The side effects of the insecticide GF-120 NF 0.02 Naturalyte CB® were evaluated on adults of Eretmocerus paulistus Hempel, a parasitoid of Aleurothrixus floccosus (Maskell) in citrus orchards of northern Chile. LC50 and LC90 were determined by applying the insecticide using a Potter tower in decreasing doses from 0.96 to 0.1 mg a.i. L -1 (corresponding to 1% to 0.1% of the recommended dose, respectively). After 24 h of exposure, the results were fitted to a probit model, and the LC50 and LC90 were estimated at 0.21 and 0.79 mg a.i. L -1 , respectively. In feeding tests and evaluation of the toxic effect of dry residues of GF-120, it was determined that a high percentage of mortality (100%) was obtained using a combination of 24.0 mg a.i. L -1  x residues at 1 hour drying time. Residues at 96 h (4 days) drying time with concentrations of 38.4 or 24.0 mg a.i. L -1 caused mortalities over 60%. According to the classification of the IOBC (International Organization for Biological and Integrated Control of Noxious Animals and Plants) the manufacturer’s recommended concentration of 96 mg a.i. L -1 was level 4, which is harmful (> 99%), as GF-120 concentrations can range from 0.77 to 72 mg a.i. L -1 . The GF-120 residues applied on inert surfaces were harmful to E. paulistus with a high mortality rate under laboratory conditions. Field studies are needed to validate these results by evaluating parasitoid populations in insecticide-treated and untreated areas. Se evaluo el efecto colateral del insecticida GF-120 NF Naturalyte 0.02 CB® sobre adultos de Eretmocerus paulistus , parasitoide de Aleurothrixus floccosus en citricos en el norte de Chile. Se determino la CL50 y CL90, aplicando el insecticida mediante torre Potter, en dosis decreciente desde 0,96 hasta 0,1 mg a.i. L -1 (correspondientes al 1% y al 0,1% de la dosis recomendada, respectivamente). Los resultados correspondientes a las 24 h se ajustaron a un modelo Probit y se estimaron en 0,21 y 0,79 mg i.a. L -1 (CL50 y CL90, respectivamente). En ensayos de alimentacion y evaluacion del efecto toxico de residuos secos de GF-120, se determino que la mayor mortalidad (100%) se obtuvo con una combinacion de 24,0 mg i.a. L -1  x residuos de 1 hora. Residuos de 96 h (4 dias), con concentraciones de 38,4 o 24,0 mg i.a. L -1 , produjeron mortalidades superiores al 60%. De acuerdo a la clasificacion de la IOBC (International Organization for Biological and Integrated Control of Noxious Animals and Plants), la concentracion recomendada por fabricante de 96 mg i.a. L -1 fue de nivel 4 (perjudicial, >99%), lo mismo ocurrio con concentraciones de GF-120 que variaron entre 0,77 a 72 mg i.a. L -1 . Los residuos de GF-120, aplicados sobre superficies inertes fueron danino para E. paulistus , con altas tasa de mortalidad bajo condiciones de laboratorio. Se requieren estudios de campo para validar estos resultados evaluando poblaciones del parasitoide en areas tratadas y no tratadas con este insecticida.

ciencia e investigación agraria

Side effects of the natural pesticide Spinosad (GF-120 Formulation) on Eretmocerus paulistus (Hymenoptera: Aphelinidae), a parasitoid of the whitefly Aleurothrixus floccosus (Hemiptera: Aleyrodidae), under laboratory conditions