Sieving Infested Flour: The Aperture That Removes the Adults and Leaves the Eggs, and the Finer Mesh That Still Leaves Most of Them
Year: 2026
Type: article
Abstract: Sieving is the traditional household response to flour beetles, performed with whatever sieve the kitchen holds. This study computes stage-by-stage removal for the red flour beetle using stated stage widths (egg 0.35 mm, young larva 0.5 mm, older larva 0.9 mm, pupa 1.1 mm, adult 1.2 mm), a logistic retention curve, and a starting contamination of 98 insects per kg across stages. A common 1.0 mm kitchen sieve removes 94.3 percent of adults but only 17.2 percent of all stages, and effectively no eggs. A 0.6 mm mesh removes 39.6 percent overall; 0.45 mm removes 58.8 percent, including 19.8 percent of eggs, at a stated flour handling loss of 4.5 percent; even 0.3 mm removes only 85.0 percent overall and 66.8 percent of eggs. Sieving therefore cannot clean infested flour — it can only decapitate the visible population — and the originated rule is to sieve for inspection and salvage decisions, never as a cure: flour worth keeping should be frozen or heat-treated after sieving, and flour with contamination near the modelled level should be discarded. This study is simulated, not measured. SIMULATED, NOT MEASURED.
Author: Aldred, William Alexander
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W7225735069
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