Density Regulating Mechanism of the Larvae of Rice Weevil in a Rice Grain

NDL Digital Collections
  • ARAKAKI,Norio
    Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University
  • TAKAHASHI,Fumiki
    Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University

Bibliographic Information

Other Title
  • 米粒中におけるコクゾウの幼虫個体数制御機構

Search this article

Abstract

Though the frequency distribution of eggs of rice weevil, Sitophilus zeamais MOTSCHULSKY on a rice grain approximately coincides with the Poisson distribution, only one adult could emerge from a single grain as a result of contest type competition. The regulating mechanism of larval number in a rice grain was examined by using three varieties of rice grain and artificial rice pellets of different sizes. From the experimental data, we considered that limited food supply, volatile substances and biological conditionings to prevent larval development were not main reasons for larval density regulation. Daily inspection of pellets which contained various number of eggs was carried out, and the number of larvae decreased to only one during the second instar. So the major mechanism regulating larval density was considered to be cannibalistic activity among larvae.

Journal

  • 昆蟲

    昆蟲 50 (4), 588-598, 1982-12-25

    東京昆蟲學會

Details 詳細情報について

Report a problem

Back to top