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Research Article
Influence of Temperature and Humidity on the Population Growth of Rhyzopertha dominica (F.) (Coleoptera: Bostrichidae) on Milled Rice

L.P. Astuti, G. Mudjiono, S. Rasminah and B.T. Rahardjo

Journal of Entomology, 2013, 10(2), 86-94.


One of the most important pest storage on milled rice is Rhyzopertha dominica (Coleoptera: Bostrichidae). Despite of both quantity and quality of food, temperature and relative humidity in the warehouse are important factors that affect the development and growth population of R. dominica. The effect of temperature and humidity on the population growth of R. dominica (F.) on milled rice was studied in a laboratory experiment. The treatment consisted of eight temperature levels (20, 25, 30, 32, 34, 36, 38 and 40°C) and three levels of relative humidities (60, 70 and 80%). The result showed that at all levels of relative humidity tested, R. dominica did not survive at 40°C, whereas at 38°C some R. dominica produced eggs but none of them hatched. With the temperature-dependent equation it was found that the optimum temperature to produce egg number, larvae number and adult number were 35.05, 33.59 and 33.27°C, respectively. At those optimum temperature, the maximum predicted of egg number, larvae number and adult number occurred at 80% relative humidity, i.e., 209.33 eggs, 128.64 larvae and 38.75 adult insect. The study also showed that R. dominica had the shortest (25.00 days) developmental time at 36°C with 80% relative humidity. The longest developmental time (106.33 days) was observed at 20°C with 60% relative humidity. At all relative humidity levels tested, the growth index of R. dominica increased with increasing the temperature up to 34°C and then it decreased with further temperature increase.

ASCI-ID: 48-369

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