INFLUENCE OF THERMAL ACCLIMATION ON THE SURVIVAL OF SITOPHILUS GRANARIUS (L.) AND ORYZAEPHILUS SURINAMENSIS (L.) AT LOW TEMPERATURES by J. MIGNON, E. HAUBRUGE and CH. GASPAR (Unit of general and applied Zoology, Faculty of Agricultural Sciences, 2, Passage des Déportés, 5030 Gembloux, Belgium) ABSTRACT Low temperatures have been used for many years to control populations of stored-product insects. The aim of aeration was primarily to cool down the grain and then to prevent its deterioration by reducing the number of insects. In Belgium, the mild winters enable insects to survive to the next season. In autumn, the progressive lowering of temperature has an acclimation effect on stored-product insects. The present study was undertaken to determine the survival at low temperatures of non cold- acclimated and laboratory- and field-cold-acclimated insects. We have chosen to work with the granary weevil Sitophilus granarius (L.) and the saw-toothed grain beetle Oryzaephilus surinamensis (L.). They are the most frequent stored-grain pests in Belgium. To compare the cold-hardiness of different laboratory cold-acclimated insects, S. granarius and O. surinamensis were placed at nine different cold-acclimation temperature regimes. Insects were kept at 5°C for 2, 4 and 6 weeks or at -5°C for 4, 7 and
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1995
Keywords: Sitophilus granarius; Oryzaephilus surinamensis; Coleoptera; thennal acclimation; low temperatures
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