ツメクサタコゾウムシの生態に関する研究

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  • Ecological Studies on the Lesser Clover Weevil, <i>Hypera nigrirostris</i> (FABRICIUS)
  • ツメクサタコゾウムシ ノ セイタイ ニ カンスル ケンキュウ 1
  • 1. Relation between the Feeding Activity of Adult and Temperature
  • 第1報 成虫の摂食活動に及ぼす温度の影響

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In this paper the relation between the feeding activity of the prehibernant adult of the lesser clover-leaf weevil, Hypera nigrirostris, and temperature was dealt with.<br>Total amounts of food consumption by the adult, during the prehibernation, are nearly equal under the temperatures, 10°, 15°, 20°, 25°, and 28°C.<br>The duration of feeding is shortened according to the rise of temperature.<br>Under higher temperatures such as 20°∼28°C the feeding activity of the adult for the first seven days after emergence is very active, but declines rapidly with the lapse of time.<br>While under a lower temperature such as 10°C the feeding activity of adult is invariable through the duration from emergence to hibernation. The death rate of the adult under 28°C reached 50% in these experiments.<br>From these results the temperature zone of the feeding activity of the adults is in the range from 10° to 28°C, and it appears that the optimum temperature of the activity is in the range between 15° and 20°C.

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