Abstract
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. Keywords: ash, control, inert dust, silica, stored product pest
Highlights
Rhyzopertha dominica (F.) is one of the primary pests in stored rice
Adult mortality on giant bamboo leaves ash at 8 g kg-1 dose was significantly higher than other treatments (99.33%) on 1 days after infestation (DAI)
According to analysis of silica content (SiO2) by X-ray Fluorescent (XRF) method was relatively higher in rice husks ash (77.7%) and giant
Summary
Insect Diet Brown rice Ciherang variety was used for R. dominica rearing and White rice seed Ciherang variety was used in the experiment. Dominica rearing and White rice seed Ciherang variety was used in the experiment These materials were removed from debris i.e. rocks, husks, damage seeds, and insect infestation. Insect rearing was done by infest 200 adults insect into 500 g of brown rice for seven days in the glass tube (Ø= 14.5 cm; h= 16 cm) and covered by gauze materials for air circulation [19]. Adult infestation were removed and the feed was incubated until F1 progeny emerged as the treated insect. Inert Dust Preparation Five types of ash as inert dust materials that used in this research were from Bromo mountain volcanic ash, rice husks, corncobs, giant bamboo leaves, and coconut shells. Two levels of dose were used in this research, i.e. 4 and 8 g kg-1 of rice seed
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