Failure control of Plutella xylostella (Lepidoptera: Plutellidae) and selectivity of their natural enemies to different insecticides
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Department of Agronomy, Federal University of Sergipe, 49100-000, Sergipe, Brazil
Department of Entomology, Federal University of Viçosa, 36570-900, Viçosa, Brazil
Technology Center of Paulínia, DuPont of Brazil S.A., 13140-000, Paulinia, Brazil
Department of Agriculture, Federal Institute of Education, Science and Technology Baiano, 45.985-970, Brazil
Submission date: 2017-11-17
Acceptance date: 2018-02-27
Journal of Plant Protection Research 2018;58(2):161–167
Control failure of pests and selectivity of insecticides to beneficial arthropods are key data for the implementation of IPM program. In the context, this study aimed to assess the control failure likelihood of Plutella xylostella and the physiological selectivity active ingredients to parasitoid Oomyzus sokolowskii (Hymenoptera: Eulophidae) and to predators Polybia scutellaris (Hymenoptera: Vespidae) and Lasiochilus sp. (Hemiptera: Anthocoridae). In bioassays, larvae of P. xylostella and adults of O. sokolowskii, P. scutellaris and Lasiochilus sp. were used. Concentration-mortality curves of six insecticides for P. xylostella were established. These curves were used to estimate the mortality of P. xylostella in recommended concentration, in order to check a control failure of insecticides to this pest. Furthermore, the lethal concentration for 90% of populations (LC90) and the half of LC90 were used in bioassays with the natural enemies to determinate the selectivity of these insects to insecticides. All tested insecticides showed control failure to P. xylostella, indicated by high LC90 and low estimated mortalities (less than 80%). The cartap insecticide was selective in half of LC90 to Lasiochilus sp. and moderately selective in LC90 and the half of LC90, to Lasiochilus sp. and P. scutellaris, respectively. Deltamethrin was moderately selective in the half of LC90 to predator Lasiochilus sp. Cartap, carbaryl, and deltamethrin reduced the mortality of Lasiochilus sp. in the half LC90. The results also showed that the insecticides methamidophos, carbaryl, parathion methyl, and permethrin were not selective to any of the tested natural enemies. The role of insecticides in IPM systems of Brassica crops is discussed based on their control failures to P. xylostella and selectivity to their natural enemies.
Julio Claudio Martins   
Department of Agriculture, Federal Institute of Education, Science and Technology Baiano, 45.985-970, Brazil
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