ミナミネグサレセンチュウの卵および幼虫の発育

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  • 後藤 昭
    長崎県総合農林センター愛野馬鈴薯センター

書誌事項

タイトル別名
  • The Embryonic and Larval Development of <i>Pratylenchus coffeae</i> (ZIMMERMANN) (Nematoda: Tylenchida)
  • ミナミネグサレセンチュウ ノ タマゴ オヨビ ヨウチュウ ノ ハツイク

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The embryonic and larval development of the root-lesion nematode, Pratylenchus coffeae was studied.<br>1. About 40 per cent of newly deposited eggs of the nematode were in two-celled stage, about 30 per cent in one-celled stage, and 30 per cent or so in three-celled stage in summer at 30∼33°C.<br>2. The following is the time-table of the embryonic development of this nematode:<br>3. The first molt of the nematode occurs in egg-shell. The time necessary for the embryonic development in water ranged from 6 to 8 days at 28°∼30°C.<br>4. Three molts occur after hatching, during the larval development in potato tubers.<br>5. Body length of the molting larvae, the development of gonads, stylet length and position of excretory pore for the larvae of every stage are described in the text. By some of these criteria, the stage of larvae is to be distinguished in ecological investigations.<br>6. Sex of this nematode is distinguishable in the fourth (pre-adult) stage of larvae by the structure of the gonads, while the external appearance of aged fouth-stage males differs from that of females.<br>7. In water, superimposed molts were found and tiny adult females which bear two undiscarded cuticles were observed in survival investigations.<br>8. The life span of the nematode in potato tubers was about 27 days in average, under optimum temperature conditions (at 25°∼30°C). Days required for the larvae to complete every stage were not ascertained because of their individual variability, but adult nematodes began to appear in about two weeks after hatching and gravid females in three weeks.

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