ニカメイガ第2世代幼虫の水稲茎内における生息部位

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  • Vertical Inhabiting Distribution of Second Generation Larvae of the Rice Stem Borer, <i>Chilo suppressalis</i> WALKER in the Stem of Rice Plant
  • ニカメイガ ダイ2 セダイ ヨウチュウ ノ スイトウ ケイ ナイ ニ オケル セイソク ブイ

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1. The egg masses of the rice stem borer moth in the second generation are laied frequently on the under side of rice leaves, as compared with on the upper side of leaves or the leaf sheaths. The frequency of laying the egg masses is the highest on the 3rd leaf and the least on the top and 5th (the lowest) leaves.<br>2. The newly-hatched larvae from eggs deposited on a leaf, bore into the stem at parts around leaf attachment of respective leaf, particularly of top, 2nd and 3rd leaves. In the case in which larvae hatched on the 4th leaf, however, many larvae enter the stem at the higher position.<br>3. The borers in the rice stems move gradually downwards. The most active downward movement of the borers occurs with the disparsion and the most larvae matured live in the lowest position of the stem.<br>4. There are the close relationships between the developmental stages of rice plant and the age distribution of larvae, as well as the inhabiting position of larvae in the stem. In the early-ripening rice plants, the growth stage of larvae advances, and inhabiting position of them is lower in the stem, as compared with those in the late-ripening ones. It is possible to explain the above-mentioned facts by the oviposition preference of the moth and by the higher mortality of larvae which have bored in the stem after the heading.

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