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Control of beetles and mites in milk powder and cheese stores by hydrogen phosphide fumigation

, : Control of beetles and mites in milk powder and cheese stores by hydrogen phosphide fumigation. South African Journal of Dairy Science 19(1): 7-13

During fumigation with phosphine gas (theoretical conc. 2 g PH3/m3) the gas did not only penetrate densely packed commodities (maximum 730 mg/kg air) but also conventionally closed bags of dried milk. The following insects were found in milk powder: Tribolium castaneum (red flour beetle). Tribolium confusum, Stegobium paniceum (drug store beetle) and Lassioderma serricorne (cigarette beetle). The mites identified from cheese stores were of the genus Tyrophagus (mainly Tyrophagus longior). The beetles were easily eradicated at 20 to C while the mites could only be eliminated for a limited period of time (ca. 3 months). Mites could not be eradicated at a temperature of C. Two weeks after fumigation the PH3 residue content of cheese and milk powder was below the maximum residue limit of 0,01 mg/kg.

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