Abstract

The susceptibility of six milled rice varieties (IR-64, Ciherang, Membramo, Cibogo, Sembada, and Intani-2) to the Lesser Grain Borer (Rhyzopertha dominica, F) was studied by No Choice Test Method under laboratory condition (27 ± 2°C and 65 ± 5% RH). The Susceptibility was assessed on the basis of eggs number laid by female insects, the number of F₁ 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 F₁ 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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