Evaluation of natural diatomaceous earth deposits from ...
Evaluation of natural diatomaceous earth deposits from South Eastern Europe for stored-grain protection:
The effect of particle size
Bill J. Vayias1,*, Christos G. Athanassiou1, Zlatko Korunic2 and Vlatka Rozman3
1Laboratory of Agricultural Zoology and Entomology, Agricultural University of Athens, 75 Iera Odos str., 11855, Athens, Greece
2 Diatom Research and Consulting Inc., 14 Greenwich Dr., Guelph, ON, N1H 8B8, Canada
3Department for Plant Protection, University of Josip Juraj Strossmayer in Osijek, 3 Trg Sv. Trojstva, 31100 Osijek, Croatia
*Author for correspondence: bvayias@
Abstract
BACKGROUND: The use of Diatomaceous Earths (DEs) provides a promising alternative to the use of contact insecticides in stored product IPM. Geographical origin and the physical properties of a given DE may affect its insecticidal activity. In our study, DE samples were collected from different locations of south-eastern Europe and their efficacy was evaluated in the laboratory against Cryptolestes ferrugineus (Stephens) (Coleoptera: Cucujiidae), Sitophilus oryzae (L.) (Coleoptera: Curculionidae) and Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae). In addition, three fractions comprising particles of different size were obtained from each DE sample and assessed with regards their effectiveness against the above stored-product insect pests.
RESULTS: DE from the Greek region of Elassona was the most effective against C. ferrugineus and S. oryzae, whereas the DE Kolubara 518, mined in the Serbian region of Kolubara, was the most effective against R. dominica. Smaller particles were more effective than the larger particles against the three tested species, although significant differences in the efficacy of the fractions containing particles of 0-150 microns and particles with sizes ................
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