1. Toxicity and cytotoxicity of the insecticide imidacloprid in the midgut of the predatory bug, Podisus nigrispinus.
- Author
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Martínez LC, Plata-Rueda A, Gonçalves WG, Freire AFPA, Zanuncio JC, Bozdoğan H, and Serrão JE
- Subjects
- Animals, Biological Control Agents, Gastrointestinal Tract metabolism, Heteroptera metabolism, Lethal Dose 50, Predatory Behavior drug effects, Toxicity Tests, Gastrointestinal Tract drug effects, Heteroptera drug effects, Insecticides toxicity, Neonicotinoids toxicity, Nitro Compounds toxicity
- Abstract
The selectivity of insecticides on natural enemies in pest control are an important strategy for Integrated Pest Management. However, insecticides can have side effects on non-target organisms such as natural enemies. This study evaluated the histological and cytological changes mediated by the sublethal concentration of the imidacloprid insecticide on the midgut of non-target predator Podisus nigrispinus (Heteroptera: Pentatomidae), used in the biological control of pests. Imidacloprid was toxic for P. nigrispinus with LC
50 = 3.75 mg L-1 and survival of 51.8%. This sublethal concentration of imidacloprid causes histological alterations in the midgut epithelium and cytotoxic features were irregular border epithelium, cytoplasmic vacuolation, and apocrine secretions in the first 6 h after exposure with the insecticide. Apoptosis in the digestive cells occurs after 12 h of exposure in the midgut. These results suggest that imidacloprid may affect the digestive physiology of P. nigrispinus and compromise the effective predation of this insect a biological control agent. The associated use of this insecticide with the predator in pest control should be carefully evaluated., (Copyright © 2018 Elsevier Inc. All rights reserved.)- Published
- 2019
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