Letter | Published:

Development of Eggs before the Final Moult in Pratylenchus


AMONG nematodes separated from soil about the roots of Grenache vines in February 1957 were females of Pratylenchus which carried eggs at their tails, outside the body but within a partly cast cuticle. Six specimens were recovered from a few pounds of soil. The life-cycle of a typical Pratylenchus 1 includes four moults from egg to adult, the first moult occurring in the egg, where the second-stage larva may be distinguished by the appearance of a well-defined buccal spear. In each of these specimens the egg contained a clearly differentiated second-stage larva. The cuticle of the nematode was detached at the head region and at the rear of the body from a point anterior to the vulva. Many normal specimens of Pratylenthus were also present, and one apparently larval female carried an egg with a second-stage larva in the oviduct.

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  1. 1

    Jensen, H. J., Ph.D. dissertation, University of California Library (1950).

  2. 2

    Sher, S. A., and Allen, M. W., Univ. Calif. Pub. Zool., 57, 441 (1953).

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