Abstract
The efficacy of three native entomopathogenic nematode (EPN) isolates Steinernema feltiae UKK-1, S. feltiae DTK-6, and S. feltiae UIP-19) on the adults of Sitophilus oryzae (L.), (Curculionidae: Coleoptera) was investigated at different concentrations (50, 100, 250, 500, 1000 and 2000 IJs/adult) in laboratory bioassays (25oC and 65% RH). Mortality rates of S. oryzae were evaluated after 4th and 8th day of exposure time. Mortality rates increased with the increasing the concentrations and ranged between 7% and 92%. The highest mortality rates were 80% and 92% at the 4th and 8th days after treatment, respectively. The results from the laboratory tests showed that EPN isolates tested have a good potential for the management of S. oryzae.
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