シロイチモジマダラメイガおよびマメシンクイガの分布・発生に関する研究

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  • Studies on the Distribution and Abundance of the Lima Bean Pod Borer, <i>Etiella zinckenella</i> TRETISCHKE, and the Soy Bean Pod Borer, <i>Grapholitha glycinivorella</i> MATSUMURA
  • シロイチモジマダラメイガ オヨビ マメシンクイガ ノ ブンプ ハッセイ ニ カンスル ケンキュウ 2
  • II. On the Relationship between Their Abundance and the Soil Type
  • 第2報 両種の分布・発生と土壤との関係について

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In the first report, we mentioned the distribution and the abundance of the two pod borers of soy bean, Etiella zinckenella TREISCHKE and Grapholitha glycinivorella MATSUMURA, in Kanto District, with particular reference to their relationships to the annual average temperature. The mature larvae of both borers hibernate in soil. This paper deals with the relationship between their abundance and the soil type.<br>Surveys were made in 1957 and 1958, covering 88 soy bean fields of light, diluvial volcanic ash soil and of heavy alluvial soil in Saitama Pref., on the abundance of these pod borers. The borer's abundance was estimated based on the extent of damage of the pod. Examinations were also made from 1955 to 1957 on the extent of damage of the soy beans grown in the diluvial and alluvial fields belonging to the experiment station. Soy bean varieties of different ecological types were used in the examination.<br>It was generally found that the abundance of G. glycinivorella is much influenced by the soil type, and it is more abundant in the fields of diluvial soil. E. zinckenella, however, is little influenced by the soil type in the abundance. The former is less abundant in low land covered with heavy soil and of poor percoration of water where water stands after rain. It is fairly abundant in the fields lying on elevated places or on slopes and covered with loose soil which is well granulated, porous, and of good percoration and aeration. Even in the fields of heavy soil which is of low poresity, the borer is by no means scarce if the fields are located on the elevated places or on slope and are well drained. On the other hand, it is rather scarce in the fields covered with light soil but is ill drainable.<br>It may be concluded therefore that the abundance of the soy bean pod borer, G. glycinivorella, is affected not only by the soil but also by the topography and the amount of rain. In other words, the abundance is influenced by the complex local condition.

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