Experimental invasion of a food container by first-instar larvae of the Indian meal moth, Plodia interpunctella Hubner, through pinholes

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  • ピンホールから食物容器内へのノシメマダラメイガ 1 齢幼虫の侵入実験
  • Experimental invasion of a food contain

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Pinholes of several sizes were exposed to Indian meal moths, and larval invasion through the pinholes was examined under the laboratory cage conditions. Hatching larvae could not penetrate 0.020mm-thick polyethylene film with no pinholes. Pinholes of 0.398mm or 0.450mm diameter resulted in as many larvae found in the food container as those of 0.495mm diameter. Fewer larvae (less than 1/10 of those through pinholes of 0.495mm diameter) invaded food containers through pinholes of 0.293mm diameter, and no larvae invaded through 0.173mm pinholes. Even a single pinhole of 0.495mm diameter could attract half as many larvae as a container opening of 29.2mm diameter, demonstrating the importance of a single pinhole. No eggs were deposited through the pinholes even of 0.495mm diameter, the largest size tested.

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