Integrated effects of diatomaceous earth and corn genotypes on mortality of red flour beetle Tribolium costaneum (Herbst) (Col., Tenebrionidae) in laboratory conditions

The study was done during 2010-2011 to investigate the integrated effects of diatomaceous earth and three genotypes of corn on adults mortality of red flour beetle Tribolium costaneum in laboratory conditions (27°C، 60±5% RH and dark). The adults of red flour beetle fed with three concentrations of diatomaceous earth (0. 5، 1 and 1. 5 gr/kg) on three genotypes of corn in 4 replications. The mortality of T. castaneum was recorded after 2، 7 and 14 days and compared with control. Results showed that there was significant differences between genotypes and different concentration of diatomaceous earth. The comparison of means showed that 1 gr/kg concentration and KE1728/8 genotype of corn were the best treatment separately. Results of integrated effects showed that percentage of mortality hada significant difference only on 14th days. So 0. 5 gr/kg concentration of diatomaceous earth and KE720/12 genotype are recommended as the best integration.