Emigration activity of the saw-toothed grain beetle OryzaePhilus surinamensis L. (Coleoptera: Silvanidae) in various environmental temperatures
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Pedagogical University of Cracow, Institute of Biology Podbrzezie 3, 31-054 Kraków, Poland
Małgorzata Kłyś
Pedagogical University of Cracow, Institute of Biology Podbrzezie 3, 31-054 Kraków, Poland
Submission date: 2012-02-27
Acceptance date: 2012-07-13
Journal of Plant Protection Research 2012;52(4):397–400
The study pertained to the saw-toothed grain beetle Oryzaephilus surinamensis L., a dangerous pest of stored food products. The studies were carried out in the laboratory. Thermostats were set at a temperature of 31°C; an optimum temperature for this insect species, and in temperatures lowered to 28 and 22°C. The relative air humidity was kept at 60 ±5% relative humidity (RH). The main topic of the study was to examine the effect of lower temperatures in the environment, on the emigration activity of O. surinamensis . In these conditions, the population dynamics and the sex structure in O. surinamensis populations were also studied. The saw-toothed grain beetle was found to display very high emigration activity at 31 and 28°C. Lowering the temperature to 22°C caused a decrease in emigration activity and total inhibition of emigration activity until the 120th day of the experiment. A higher emigration levels among females rather than males, was also observed.
The authors have declared that no conflict of interests exist.
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