The extent of damage to stored milled rice due to insect infestation
1984
Sidik, M. | Pedersen, J.R.
Maize weevils (MW), Sitophilus zeamais, caused significant losses and damage to the rice. Increased numbers of the insect were closely correlated with increased M.C. [moisture content], temperature, and number of damaged kernels. Highest M.C. and largest quantities of dust (composed chiefly of insect frass and kernel fragments) were found near the bottom level of the barrels. Increase in M.C. was followed by invasion of kernels by a succession of fungi. Aspergillus1639glucus was predominant after 12 weeks of storage but was replaced by A. candidus after 16 weeks. Caked material and dust found after 20 weeks yielded A. glaucus, A. candidus, A. versicolor, A. niger, Penicillium spp. and yeast. A trace amount of aflatoxin B1 (5 ppb) was detected in one sample of caked material. Quantitative measurements of dry matter weight loss caused by MW infestation ranged from 0.92 to 37.29% with an inconsistency in the degree of loss shown by the three methods used. Single and multiple linear regression equations were established to predict weight losses. Quality deterioration was assessed by a panel of nine persons which compared the odor of rice samples from three locations in each system with a reference sample stored at 4 C. Multiple comparison difference analysis indicated that MW altered the odor of rice after 12 weeks, whereas the odor of non-infested rice did not differ significantly from the refere
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