4種ネコブセンチュウのサツマイモに対する寄生と増殖

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タイトル別名
  • Penetration and Reproduction of Four Major Root-knot Nematodes, <I>Meloidogyne</I> species, in Sweet Potato, <I>Ipomea batatas</I>
  • 4シュ ネコブセンチュウ ノ サツマイモ ニ タイスル キセイ ト ゾウショク
  • Penetration and Reproduction of Four Major Root-knot Nematodes, Meloidogyne species, in Sweet Potato, Ipomea batatas

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説明

To determine host suitability of sweet potato to major Meloidogyne species, penetration of second stage juveniles (J2) and their early development, and production of egg-masses were examined. Cuttings of four sweet potato cultivars, Norin No.1, Norin No.2, Kokei No.14 and Beniazuma, rooted in 200g of sterilized potted soil were inoculated with approximately 500 newly hatched J2 and grown in a green house at an average temperature of 27°C. Five days after inoculation penetration and development of J2 were examined, and after 35 days numbers of egg-masses on root systems were counted. Numbers of egg-masses produced by M. incognita markedly varied according to cultivars. M. arenaria laid some eggmasses on cultivars except Norin No.1 on which no egg-mass was observed. A few eggmasses were produced by M. hapla on all four cultivars, but none by M. javanica. J2 of M. arenaria, M. incognita and M. javanica penetrated roots of all cultivars well and more than 50% of penetrated J2 enlarged as early as five days after inoculation on cultivars with eggmasses, though only a few J2 enlarged on those cultivars with no egg-masses. J2 of M. hapla penetrated roots of all 4 cultivars but only a few J2 penetrated and developed.

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