The mechanical impact of rice polishing on the rice weevil,Sitophilus oryzae (L.), and the subsequent postpolishingeffects associated with rice quality were studied. “Brown” rice(not polished), “White (infest then polish)” rice, and “White(polish then infest)” rice were used with different polishing processintensities and different initial weevil densities. Weevil progeny weremore numerous in Brown than in White (infest then polish) or White(polish then infest) rice. Polishing corresponding to a weight loss of11% in rice generated an immediate mortality of ≈40%; thesubsequent mortality caused by rice quality was also 40% (total>80%). A polishing process corresponding to 14 and 16% of riceweight loss generated a drastic mortality in the weevil population(>95%). The progeny per adult weevil was similar with high and lowinitial weevil densities. The development of weevil progeny was alsodelayed by about 1 wk in White (infest then polish) rice compared withBrown rice. Furthermore, weevil adults of the progeny weresignificantly heavier in Brown than in White (infest then polish) orWhite (polish then infest) rice.
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