Relative Susceptibility of Haeckeliania sperata (Hymenoptera: Trichogrammatidae) to Pesticides Used in Citrus and Ornamental Systems in Florida
Authors: Carrillo, Daniel; Peña, Jorge E.; Rogers, Michael E.
Source: Journal of Economic Entomology, Volume 102, Number 3, June 2009 , pp. 905-912(8)
Publisher: Entomological Society of America
Abstract:Haeckeliania sperata Pinto is an egg-endoparasitoid of Diaprepes abbreviatus L. (Coleoptera: Curculionidae). We evaluated the relative susceptibility of H. sperata adults to commercially relevant pesticides used in citrus and ornamental production systems. Parasitoids were exposed to pesticide residues on leaf surfaces. Four concentrations of seven pesticides were tested; concentrations for each pesticide consisted of a dilution series using the label rate for field applications as the starting concentration. Lethal concentrations (LC50s and LC90s) were calculated 12 and 24 h after exposure to the pesticides. Lethal times (LT50s and LT90S) were estimated for each pesticide concentration. All tested pesticides had a negative effect on Haeckeliania’s survivorship. However, some pesticides were significantly less harmful to this parasitoid. LC50s and LC90s of organophospate, carbamate, and pyrethroid pesticides were less than one eighth of the label rates. LT50s and LT90s of these insecticides were <12 h even at the most diluted concentrations. Thus, applications of these pesticides might have a strong negative impact on the natural control of D. abbreviatus by H. sperata. Commercial formulations of imidacloprid, abamectin, petroleum oil, and a phosphonate fungicide allowed H. sperata to live longer compared with the previous pesticides, suggesting a certain degree of selectivity. Moreover, adults exposed to diluted concentrations of imidacloprid, abamectin, petroleum oil, and a phosphonate fungicide had a greater survival than those exposed to label concentrations. These findings suggest that the use of products that have less toxic effects on the introduced parasitoid will increase its chances to parasitize D. abbreviatus eggs.
Document Type: Research Article
Publication date: 2009-06-01
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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