Development and oviposition preferences of the Indian meal moth, <i>Plodia interpunctella</i> (Hübner) on dried radish

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  • 切り干し大根におけるノシメマダラメイガの発育と産卵選好性
  • キリボシ ダイコン ニ オケル ノシメマダラメイガ ノ ハツイク ト サンランセン コウセイ

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Abstract

<p>We investigated larval development of the Indian meal moth, Plodia interpunctella (Hübner) on dried radish, a Japanese preserved food. Radishes were cut before drying into three standard shapes: round slices, long thin strips, and lengthwise in quarters. First instar larvae (n＝3) were placed on 5 g of each dried radish preparation and maintained at 25°C, 60％ relative humidity (RH), and 16L 8D. We recorded their development period, emergence rate, and adult weight. The mean development period±SE was 34.8±0.3 days on round slices, 37.0±0.4 days on strips, and 40.9±0.4 days on quarters (n＝30). The adult emergence rate was 86.6％ on round slices, 96.6％ on strips, and 83.3％ on quarters (n＝30). The mean adult weight on round slices was 5.6±0.1 mg (♂) and 9.2±0.2 mg (♀); on strips, it was 5.5±0.4 mg (♂) and 8.3±0.1 mg (♀), and on quarters, it was 6.1±0.1 mg (♂) and 9.3±0.4 mg (♀) (n＝30).</p><p>We then performed a two-choice test for female oviposition preference using two foodstuffs: brown rice and dried radish. Two plastic containers, one containing 5 g brown rice and the other containing 5 g dried radish, were placed in a plastic box measuring 22.6×22.6 cm in width and 18.7 cm in height. One male and one female were placed in each plastic box for 3–5 days for mating and oviposition. The two plastic containers were then removed and maintained at 28°C, 60％ RH, and 16L 8D. After 14–18 days, the larvae on the two foodstuffs were counted. The mean number of larvae was 10.8±2.5 on brown rice and 130.0±14.2 on dried radish (n＝8), indicating that females preferred to lay their eggs on radish. Dried strips of radish are thus a highly suitable food material for P. interpunctella larvae, and steps must be taken to protect this foodstuff from infestation.</p>

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