Abstract
Separate populations of two species, Acarus siro L. and Glycyphagus destructor (Schrank), were used to inoculate grain with a known number of mites. Regardless of differences in species and original levels of infestation, recovery by oil flotation was never less than 75%, whereas that by sieving never exceeded 43% of true mite population. Moreover, flotation extraction from the sieved wheat recovered up to 60% of the population not extracted by the sieving technique. Sieving efficiency was also shown to be strongly biased by species differences, whereas flotation extraction varied little between the two species at a fixed density. Thus, sieving grossly underestimated the true level of infestation and was inconsistent and unreliable for quantitative estimation of mite populations in grain.
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