寄主稲の生育段階の相異とイネカラバエ幼虫の発育との関係

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タイトル別名
  • The Relation between the Larval Growth of the Rice Stem Maggot, <i>Chlorops oryzae</i> MATSUMURA, and the Stages of the Host Rice Plant
  • イネカラバエ ノ ハッセイ ニ カンスル セイタイガクテキ ケンキュウ 5
  • イネカラバエの発生に関する生態学的研究 第5報

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The larval growth of the rice stem maggot of the second brood was studied on rice plants sown at different dates and at various stages. On young plant of susceptible variety, Shirogane, most of the individuals grew to the second and third instars in ten to fourteen days after hatching except some individuals remaining as the first instar. The larval growth was excellent on the host plant at the formative stage of young panicle. On the plant in the stage between the above two, the growth of the hatched larvae was retarded and almost all the individuals remained as the first instar even on the eleventh or fifteenth day after hatching. This retardation of growth was observed from 10-leaf stage or from the latter parts of the vegetative growth, although there were small differences between the results obtained in 1958 and 1959.<br>This relation of larval growth to the host condition effected the occurrence of the rice stem maggot. In the districts where three generations occurred, the duration from oviposition to emergence of fly was longer in the second generation than in the first generation. In the districts of two generations, the larval growth was retarding until the host rice plant began to form the young panicles. The growth of the hatched larvae was suppressed as the hatching of larvae coincided with the latter part of vegetative growth to formative stage of young panicle. The said principle is also related to that the late varieties develop rather few injured panicles although they are originally susceptible, and that the early varieties develop injured panicles more although they are originally less susceptible.<br>In a Spanish variety, Bombar, no remarkable relationship was found between the larval growth and the stage of host plant and the larvae grew very rapidly. This variety seems very susceptible to the rice stem maggot. Accordingly, there may be some differences in the details of the relationship between the host plant stage and larval growth, although the general pattern of the relationship is the same.

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