CONICET | Buscador de Institutos y Recursos Humanos

The Bemisia tabaci Gennadius (Homoptera:Aleyrodidae) biotype complex is a key pest of several worldwide crops. The management and control of this pest has become difficult mainly due to its high reproductive rate and capacity to develop resistance to broad spectrum insecticides. In Argentina B. tabaci has causes economic losses in most areas of agricultural production. Eretmocerus mundus Mercet (Hymenoptera: Aphelinidae) is the most important parasitoid of B. tabaci and is commercialized as a biocontrol agent, mainly in Europe. Conservation of this biological control agent in Argentinian orchards requires the adoption of sustainable pest management techniques due the negative impact of traditional pesticides on non-target organisms. Spirotetramat (Movento®) belongs to a new class of pesticides that acts as a lipid biosynthesis inhibitor and claims to be selective towards natural enemies. The objectives of this work were 1) to evaluate the effectiveness of spirotetramat on eggs and nymphs of B. tabaci 2) to determinate the selectivity of spirotetramat on B. tabaci towards E. mundus. Whitefly´s eggs and nymphs (first nymphal settled instar) were exposed to the insecticide by foliar immersion whereas parasitoid adults (6 days old) were exposed to the insecticide by residual method during one hour, to simulate exposure of the parasitoid to the insecticide in the field. Lethal and sublethal effects of the insecticide were recorded daily. These preliminary studies have shown a high effectiveness of spirotetramat on the first nymphal instar of B. tabaci as well as a high selectivity for the pest in comparison to the parasitoid adults with a low toxicity to the parasitoid adults. These results suggest Movento® could be included in Integrated Pest Management programs although more studies are required to complete its ecotoxicological profile.