Impact of Neonicotinoid-Based Insecticide Treatments on Non-Target Arthropods in Cotton Cultivation ()
A 2024-2025 study in Côte d'Ivoire found that neonicotinoid insecticides like acetamiprid and thiamethoxam significantly reduced populations of beneficial arthropods, including lady beetles and ants, in cotton fields. Researchers at CNRA in Bouaké warned that current pesticide use risks disrupting natural pest control, urging integrated pest management strategies to mitigate harm.
A study conducted by researchers at the Centre National de Recherche Agronomique (CNRA) in Bouaké, Côte d'Ivoire, examined the impact of neonicotinoid-based insecticides on non-target arthropods during the 2024-2025 cotton growing season. The experiment tested foliar treatments of acetamiprid (at three rates), thiamethoxam, and a combination of emamectin-acetamiprid, using a randomized complete block design with five applications. Sampling revealed 202 arthropod individuals, primarily black ants (*Camponotus* sp.) and lady beetles (*Micraspis lineola* and *Exochomus nigromaculatus*), alongside red ants (*Oecophylla* sp.) and lynx spiders (*Oxyopes* spp.). Results showed significant declines in beneficial arthropod populations, with reductions ranging from 27.8% to 61.1% for lady beetles and 34.1% to 95% for black ants, while red ants were entirely eradicated in some treatments. The study highlights how neonicotinoids, widely used in West African cotton cultivation to control pests like jassids and whiteflies, disrupt natural pest regulation mechanisms. Researchers emphasize the need for integrated pest management (IPM) to minimize ecological harm, including setting intervention thresholds and rotating less harmful treatments. Cotton is a critical crop in West Africa, contributing to both local economies and export markets, but pest outbreaks can cause yield losses exceeding 50% without intervention. The findings align with broader concerns about neonicotinoids’ systemic neurotoxic effects on non-target species, including pollinators and natural predators. The authors stress that while these insecticides are effective against pests, their broad-spectrum toxicity poses risks to agricultural ecosystems, particularly in regions reliant on cotton production. The study was published in *Natural Science* by Kouakou, Kouadio, and Bini, with data collected under controlled experimental conditions. The research underscores the urgency of adopting sustainable pest control methods to preserve biodiversity and long-term crop resilience in cotton-growing regions.
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