Toxicidade residual de inseticidas aplicados sobre larvas de crisopídeos de primeiro ínstar

Maurício Sekiguchi de Godoy; Alcimar Galdino de Lira; Alricélia Gomes de Lima; Adrian José Molina-Rugama; Patrik Luiz Pastor; Elisângela de Souza Loureiro; Edson Anselmo da Fonseca Junior; Shara Clara Silva Mesquita

doi:10.1590/1983-21252025v3812569rc

Authors

Maurício Sekiguchi de Godoy Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-3842-340X
Alcimar Galdino de Lira Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-6109-857X
Alricélia Gomes de Lima Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0002-8739-4705
Adrian José Molina-Rugama Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0000-0003-0769-2305
Patrik Luiz Pastor Universidade Federal da Grande Dourados, Dourados, MS, Brazil https://orcid.org/0000-0003-1892-8029
Elisângela de Souza Loureiro Department of Plant Protection, Universidade Federal de Mato Grosso do Sul, Chapadão do Sul, MS, Brazil https://orcid.org/0000-0002-9708-3775
Edson Anselmo da Fonseca Junior Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0009-0000-1312-3163
Shara Clara Silva Mesquita Department of Agricultural and Forestry Sciences, Universidade Federal Rural do Semi-Árido, Mossoró, RN, Brazil https://orcid.org/0009-0002-0791-1483

DOI:

https://doi.org/10.1590/1983-21252025v3812569rc

Keywords:

Plant health. Melon. Pesticides. Natural enemy. Chrysoperla genanigra.

Abstract

Lacewings (Chrysopidae) are predators that regulate mealybug, aphid, whitefly, and lepidopteran populations in various important agricultural crops. The predator Chrysoperla genanigra Freitas (Neuroptera: Chrysopidae) is widely found in melon production areas, where various chemical pesticides are usually applied for pest control. Studies evaluating the impact of these pesticides on C. genanigra are incipient. Thus, the objective of this study was to assess the residual toxicity of seven insecticides on C. genanigra larvae. The experiment was conducted under laboratory conditions at temperature of 25±2 °C, relative humidity of 70±10%, and 12-hour photoperiod. The treatments tested were: azadirachtin, abamectin, cyantraniliprole, thiacloprid, pymetrozine, imidacloprid, novaluron, and distilled water (control). Insecticides were applied at the highest rates recommended by the manufacturers, and their toxicities were categorized using the method recommended by the International Organization for Biological Control (IOBC). All insecticides significantly affected larval mortality, pupation percentage, and adult emergence of the predator C. genanigra. Total accumulated mortality ranged from 93% to 100% among the analyzed insecticides; the highest mortality rate was found for first-instar larvae. The seven insecticides were toxicologically classified as Class 4 and, therefore, non-selective to the predator when tested on first-instar larvae of C. genanigra. Research under semi-field and field conditions should be conducted to assess the selectivity of the tested insecticides.

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