Insecticidal and Residual Effects of Spinosad, Alpha-Cypermethrin, and Pirimiphos-Methyl on Surfaces Against Tribolium castaneum, Sitophilus granarius, and Lasioderma serricorne

Paraskevi Agrafioti (), Marina Gourgouta, Dimitrios Kateris and Christos G. Athanassiou
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Paraskevi Agrafioti: Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou Str. Nea Ionia, 38446 Volos, Greece
Marina Gourgouta: Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou Str. Nea Ionia, 38446 Volos, Greece
Dimitrios Kateris: Institute for Bio-Economy and Agri-Technology (IBO), Centre for Research and Technology—Hellas (CERTH), Dimarchou Georgiadou 118, 38333 Volos, Greece
Christos G. Athanassiou: Laboratory of Entomology and Agricultural Zoology, Department of Agriculture, Crop Production and Rural Environment, University of Thessaly, Phytokou Str. Nea Ionia, 38446 Volos, Greece

Agriculture, 2025, vol. 15, issue 11, 1-20

Abstract: Contact insecticides are classified into two categories: as grain protectants, which are applied directly on grains, and as surface treatments, which are applied on cracks and crevices. The aim of this study was to evaluate the long-term residual efficacy of these insecticides across different surfaces and target species. Thus, we investigated the efficacy of three insecticidal formulations, spinosad, alpha-cypermethrin, and pirimiphos-methyl against stored product beetles on different surfaces (concrete, metallic, plastic, and ceramic). Adults of Tribolium castaneum , Sitophilus granarius , and Lasioderma serricorne were used in the experiments. Bioassays were carried out during a six-month period, with mortality measured after 3, 7, 14, and 21 days after exposure. Among the different insecticides tested, spinosad was the least effective against T. castaneum , especially on concrete, where mortality had decreased to zero by Month 2, whereas in most of the cases, close to 100% was recorded. Regarding S. granarius , pirimiphos-methyl and spinosad remained effective on ceramic and metallic surfaces for a six-month period, whereas alpha-cypermethrin had the lowest mortality rate. For L. serricorne , spinosad caused high mortality levels, whereas pirimiphos-methyl was the least effective after Month 4. Based on our finding, among the tested insecticides, spinosad had the long-term residual effect on stored product protection.

Keywords: contact insecticides; stored product protection; surface application; residual effect; Coleoptera (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2025
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