Kuzmanov D., N. Dimitrov (2009) Insect Population Growth in Stored Freshly Harvested Wheat (Coleoptera: Curculionidae & Silvanidae). Entomologische Zeitschrift - Stuttgart 119(4): 1-4

The temperature and insect population growth variation of freshly harvested wheat, stored in flat storehouses and steel bins (3000 t) have been investigated when using atmospheric air ventilation for cooling. At the temperature mode established, by the simulation models developed the rate of insect population growth of the rice weevil Sitophilus oryzae (Linnaeus, 1763) and the sawtoothed grain beetle Oryzaephilus surinamensis (Linnaeus, 1758) has been determined. The models validity is 78–95 % for both species of insect pests and both granaries. The insect population growth for both species has started after 23–33 days and continued up to 135 days in steel bins and respectively up to 111 and 95 days in the flat storehouses. The maximum values of numbers of Sitophilus oryzae and Oryzaephilus surinamensis populations in the flat storehouses are 60 and 80 times smaller as compared to those in the steel bin. Because of that, at grain storage in flat storehouses it is possible to abstain from fumigation.

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