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    Acute Toxicity of Fresh and Aged Residues of Pesticides to the Parasitoid Tamarixia radiata and to the HLB-Bacteria Vector Diaphorina citri


    Beloti, Victor Hugo and Alves, G.R. and de Andrade Moral, Rafael and Demetrio, C.G.B. and Yamamoto, Pedro Takao (2018) Acute Toxicity of Fresh and Aged Residues of Pesticides to the Parasitoid Tamarixia radiata and to the HLB-Bacteria Vector Diaphorina citri. Neotropical Entomology, 47 (3). pp. 403-411. ISSN 1678-8052

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    Abstract

    One method for controlling the Asian citrus psyllid (ACP) Diaphorina citri Kuwayama, the vector of the putative causal agent of Huanglongbing, uses the parasitoid Tamarixia radiata (Waterston). However, the general intensive use of insecticides has reduced the numbers of this parasitoid. This study evaluated the effect of the residual action of 24 insecticides on T. radiata and also determined the differential toxicity of insecticides to D. citri and T. radiata, using three bioassays. In the first, when adults of the parasitoid were exposed to residues of the 24 insecticides, ten were considered short-life (class 1), six slightly persistent (class 2), five moderately persistent (class 3), and three insecticides were considered persistent (class 4), under the IOBC/WPRS classification system. The second bioassay evaluated the sublethal concentrations of the persistent insecticides (formetanate, dimethoate, spinosad). Increasing the concentrations of the insecticides increased the number that were classified as persistent. In the third bioassay, evaluation of the differential toxicity of eight insecticides to the ACP and the parasitoid showed that chlorpyrifos and bifenthrin were more harmful to T. radiata. Therefore, these two insecticides are not recommended for application at the time of parasitoid release. Cypermethrin, imidacloprid, and dimethoate caused higher mortality of D. citri and are most often recommended in IPM programs. The choice of an insecticide for the control of citrus pests must be made with care, aiming to preserve the natural enemies in the ecosystem, and thereby contribute to the success of biological control.

    Item Type: Article
    Additional Information: Cite as: Beloti, V.H., Alves, G.R., Moral, R.A. et al. Neotrop Entomol (2018) 47: 403. https://doi.org/10.1007/s13744-017-0575-2
    Keywords: Selectivity; IPM; ecotoxicology; sublethal concentration; differential toxicity;
    Academic Unit: Faculty of Science and Engineering > Mathematics and Statistics
    Item ID: 11434
    Identification Number: https://doi.org/10.1007/s13744-017-0575-2
    Depositing User: Rafael de Andrade Moral
    Date Deposited: 21 Oct 2019 16:03
    Journal or Publication Title: Neotropical Entomology
    Publisher: Springer US
    Refereed: Yes
    URI:

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