PADDY HUSK ASH AS A GRAIN PROTECTANT AGAINST BEETLES

TEE SZE PENG

SUMMARY

The possibility of using powdered paddy husk ash as a stored grain protectant agains Sitophilus oryzae, Tribolium castaneum, Oryzaephilus surinamensis, Latheticus oryzae and Rhizopertha dominica was investigated. 200 g of milled rice and paddy were mixed with powdered husk ash at 1.0-2.5% w/w. Adult beetles were introduced into the polyethylene packages containing the treated grain and heat-sealed. The susceptibility of the 5 species based on time-mortality graph was in the descending order O. surinamensis > L.oryzae > R. dominica > T. castaneum > S.oryzae. Results also indicate that complete mortality for all species tested was achieved after one week exposure to grain treated with 2.0% w/w ash.

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