アズキ畑におけるアズキゾウムシの生態 (1) : 秋アズキ畑における発生消長とアズキの被害

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タイトル別名
  • Field biology of the azuki bean weevil, Callosobruchus chinensis (L.) (Coleoptera:bruchidae). I. Seasonal prevalence and assessment of field infestation of Aki-azuki, autumn variety of Phaseolus angularis W.
  • アズキ畑におけるアズキゾウムシの生態　Ｉ　　秋アズキ畑における発生消長とアズキの被害
  • アズキバタケ ニ オケル アズキゾウムシ ノ セイタイ 1 アキ アズキバタケ
  • I. Seasonal Prevalence and Assessment of Field Infestation of Aki-Azuki, Autumn Variety of <i>Phaseolus angularis</i> W.
  • I. 秋アズキ畑における発生消長とアズキの被害

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The first incidence of the azuki bean weevil, Callosobruchus chinensis (L.), was observed in the middle of August in the three Aki-azuki bean fields located in the northern part of Okayama. Thereafter the number of weevils changed and several peaks were found in the number of immigrants to the field until early November. These adults were most abundant in early October, and they laid their eggs on the mature pods from mid-September to mid-October. The mature pods of the height of 15-20cm above the ground were the mostly preferred for the oviposition sites. At the same time, it was found that the number of adults that emerged from harvested beans was highest in the central ridges and decreased towards the peripheral ridges of the field. The number of eggs per pod reached 2.06 at harvest. The larval survival rate from the egg deposition to the newly hatched larva boring into the bean in the pod was estimated to be 0.41. The percentage of beans infested by the weevils reached 14.26, that by Matsumuraeses phaseoli M. 7.19 and that by stink bug and fungi 0.52, in the field without insecticidal control. The traditional exposure of the harvested beans to the sun for a period of 1-3 days did not affect the survival of the larvae in the beans though the inner temperature of the beans reached 33.6°C and the water content was reduced by 2.5% after the exposure.

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