Abstract
An Influence of Lowered Temperature on the Migration Activity of the Population ofRhizopertha DominicaF. (Coleoptera, Bostrichidae)The subject of the study was the lesser grain borerRhizopertha dominicaF. — a dangerous pest of stored grain. The study was carried out in the laboratory at a temperature of 31°C, the optimal temperature for this species, and also in the temperature lowered to 22°C and 60±5% relative humidity. The main aim of the research was to investigate the migration activity ofR. dominicain lowered temperature. In addition the population dynamics, mortality and sexual ratio in a population ofR. dominicawere also analyzed. It was shown that lowering the temperature to 22°C caused an increase in the migration activity ofR. dominicain the initial phase of infesting a new habitat. A larger migration and mortality of females were observed. In addition, the population growth was slow and prolonged in time at the temperature of 22°C as compared to the optimal temperature. Lowering the temperature did not influence the mortality of theR. dominicapopulation.
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