Resistance of internally feeding stored product pests to pesticides: Results of the EU project novIGRain

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Abstract: The control of stored product pests still relies on using sprays and fumigation
pesticides. In the current European Union (EU) landscape, a pressing challenge is the limited
availability of effective insecticides and active ingredients for controlling stored product pests, potentially exacerbating the development of resistance among their populations. Addressing these challenges, the EU-funded project novIGRain (Horizon 2020 – Grant agreement ID: 101000663) undertook a comprehensive survey aimed at understanding the resistance dynamics among selected common and key species of storage pests (including Rhyzopertha dominica, Sitophilus granarius, S. oryzae, etc.) to phosphine, a pyrethroid – deltamethrin, and an organophosphate – pirimiphos-methyl. The study spanned multiple EU countries, including the Czech Republic. The results of the survey shed light on the species composition within commodity samples obtained from various storage facilities, providing a preliminary overview of the pest insect fauna spectrum. Additionally, the survey identified high incidence and frequency of resistance among the sampled pests in EU for R. dominica and S. oryzae. Relatively less frequent was resistance in populations/strains of S. granarius. This information is crucial for stakeholders in the agricultural and food industries, as it helps them understand the practical implications of pest resistance and underscores the need for strategic approaches in managing resistance to insecticides.

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