Laboratory evaluation of insecticidal effectiveness of a natural zeolite formulation against <i>Sitophilus oryzae</i> (L.), <i>Rhyzopertha dominica</i> (F.) and <i>Tribolium castaneum</i> (Herbst) in treated wheat

  • P. Kljajić Pesticide and Environment Research Institute, Banatska 31b, 11080 Belgrade, Serbia. Email: (P. Kljajić)
  • G. Andrić Pesticide and Environment Research Institute, Banatska 31b, 11080 Belgrade, Serbia
  • M. Adamović Institute of Technology of Nuclear and Other Mineral Raw Materials, Franše D’Eperea 86, 11000 Belgrade, Serbia
  • M. Pražić Golić Pesticide and Environment Research Institute, Banatska 31b, 11080 Belgrade, Serbia


Inert dusts are increasingly becoming an integral part of programs for protection of cereal grains from stored-product insects. The intention in this study was therefore to conduct preliminary tests of insecticidal potentials of the natural zeolite formulation Minazel SP (66% SiO2, particle size ≤ 50 μm) originating from Serbia in controlling S. oryzae, R. dominica and T. castaneum. Dust effectiveness was tested in the laboratory (24±1ºC and 50-55% r.h. for parents and 24±1ºC and 60±5% r.h. for F1 progeny) by exposing insects to wheat treated with 0.50, 0.75 and 1.00 g/kg of Minazel SP. Mortality was determined after 7, 14 and 21 days of insect contact with threated wheat, and total mortality after an additional 7 days of recovery on untreated broken wheat. Progeny production in F1 generation was also determined for each insect species after 8-12 weeks. After seven days of exposure and 7 days of recovery of all tested species, the highest efficacy of 62% was observed after the highest application rate of 1.00 g/kg against S. oryzae. The highest efficacy after 14 and 21 days was achieved with the same application rate against T. castaneum (100%), S. oryzae (96-98%) and R. dominica (70-82%). Progeny reduction (IR – inhibition rate) of all tested species depended on the duration of parents exposure to treated wheat. After 7 days of exposure progeny reduction rates were 49-67% for S. oryzae, 42-68% for R. dominica and 47-78% for T. castaneum. After 14 days of exposure, inhibition rates were 55-78% for S. oryzae, 72-81% for R. dominica and 53-90% for T. castaneum, while progeny reductions of S. oryzae were 51-85%, R. dominica 80-96% and T. castaneum 87-99% after 21 days of exposure.

Keywords: Wheat grain, Sitophilus oryzae, Rhyzopertha dominica, Tribolium castaneum, Natural zeolite
Section: Residual Insecticides - Synthetic and Botanical