Simulation models have been developed for predicting rice weevil Sitophilus oryzae (L.) and sawtoothed grain beetle Oryzaephilus (L.) population
growth in flat storehouses and steel bins with great capacity. The validity of simulation models is from 78% to 95% for both species of insect pests and both
granaries. On the basis of these models, the increase of density has been predicted after infestation detection of 0.5 insects per kg at different time of storage
from 1 September to 15 November (every 15 days). The highest level of infestation is possible to reach 387 and 194 insects per kg in steel bin and 8 and 2
insects per kg in flat storehouse for S. oryzae and O. surinamensis, respectively. The predicted results have been confirmed by monitoring infestation change of
the more dangerous insect pest, S. oryzae, in freshly harvested wheat stored in steel bins and flat storehouses, during two consecutive years – 2003 and 2004
in two farms.
D. Kuzmanov, N. Dimitrov