Failure control of Plutella xylostella (Lepidoptera: Plutellidae) and selectivity of their natural enemies to different insecticides
Journal Title: Journal of Plant Protection Research - Year 2018, Vol 58, Issue 2
Abstract
Control failure of pests and selectivity of insecticides to beneficial arthropods are key data for the implementation of Integrated Pest Management (IPM) programs. Therefore, the aim of this study was 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, P. xylostella larvae and O. sokolowskii, P. scutellaris and Lasiochilus sp. adults were used. Concentration-mortality curves of six insecticides for P. xylostella were established. These curves were used to estimate the mortality of P. xylostella at the 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 determine 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.
Authors and Affiliations
Leandro Bacci, Jander Fagundes Rosado, Marcelo Coutinho Picanco, Alfredo Henrique Rocha Gonring, Tarcisio Visintin da Silva Galdino, Julio Claudio Martins
Keywords
Related Articles
- EP ID EP541741
- DOI 10.24425/122931
- Views 79
- Downloads 0
Allelopathy in Solanaceae plants
Solanaceae plants have strong allelopathic potential, and therefore the action is confirmed through: a) bioassays with liquid or various solvent extracts and residues, b) fractionation, identification, and quantification...
How do eyespot resistance genes transferred into winter wheat breeding lines affect their yield?
Eyespot can reduce yields, even up to 50%. There are four genetically characterized resistances in wheat varieties, controlled by: (1) the Pch1 gene, transferred from Aegilops ventricosa; (2) the Pch2 gene, originating f...
Quantitative evaluation of Fusarium species and crop quality traits in wheat varieties of northeastern Poland
This research was conducted to investigate the natural, quantitative composition of the most common Fusarium species directly in fields of northeastern Poland. The concentration of Fusarium spp. and grain quality traits...
Efficacy of electrospun bionanofibers as fumigant pesticides in foodstuff storage
Essential oils as alternative synthetic pesticides for pest management of foodstuff s have recently received increased attention. Controlled and slow release formulations of essential oils are used to enhance their effic...
Tamarixia monesus (Walker) (Hym.: Eulophidae) parasitoid of Bactericera tremblayi (Wagner, 1961) (Hemiptera: Triozidae) in Iran
Bactericera tremblayi (Wagner, 1961) (Hemiptera: Triozidae) is reported on Brassica oleracea var. capitata (Brassicaceae) in northwestern Iran. Tamarixia monesus (Walker) (Hymenoptera: Chalcidoidea, Eulophidae) was reare...