The susceptibility of six milled rice varieties Ciherang, Membramo, Cibogo, Sembada, to the Lesser Grain Borer (Rhyzopertha dominica, F) was studied by No Choice Test Method under laboratory condition (27 ± 2℃and 65 ± 5% RH). The Susceptibility was assessed on the basis of eggs number laid by female insects, the number of F 1 progeny emerged, the weight loss of infested samples and also the Dobie's Index of susceptibility. The results revealed that the number of eggs laid by female insects, the number of F 1 progeny emerged and weight loss of infested samples were significantly low in Membramo variety followed by Ciherang, IR-64, Cibogo, Sembada and Intani-2. Based on the index of susceptibility, the milled rice variety of Membramo had the lowest susceptibility index and was regarded as resistant. While the milled rice varieties of Ciherang, IR-64, Cibogo and Sembada were considered as moderately resistant, Intani-2 seen as the most highly susceptible. These results imply that the milled rice variety with high phenolic content and hardness potentialy revealed resistant to the R. dominica infestation.

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Rhyzopertha dominica (F.) is one of the primary pests in stored rice. Generally, pest control in the storage was done by spraying and fumigation using synthetic insecticide. The application of chemical insecticide using phosphine can cause resistant to insect pests and toxic to humans. Regarding the negative effect of insecticide application, the alternative control by using natural resources like inert dust is expected to be a good solution to control pests of stored products. This research was aimed to study the effectiveness of five inert dusts, which are: rice husks ash, volcanic ash, giant bamboo leaves ash, corncobs ash, coconut shells ash to adult mortality and the inhibition of population growth of R. dominica on stored rice seeds. The results showed that giant bamboo leaves at 8 g kg-1 caused 100% of mortality and faster than other inert dusts tested. Giant bamboo leaves and rice husks were more effective to suppress the number of eggs, larvae, pupae, and new adults (F1). Inert dust could decrease the hatchability of eggs, inhibit population growth, and decrease the weight of new adults (F1). The damage to the treated rice seeds was significantly lower than untreated rice seeds.

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