On the egg development and its morphological observation of the root-knot nematode, meloidogyne spp

Abstract

In this paper an account is given based on a series of experiments carried out, since 1953. Plant parasitism and morphological studies of the root-knot nematode have been put on record by many authors. Recently, the writer has identified some species of the root-knot nematodes, Meloidogyne incognita acrita Chitwood, M. hapla Chitwood, allied species of M. javanica and allied species of M. arenaria. In the present paper, the writer wishes to describe the egg size of three root-knot nematodes species and some observations of the embryonic development in the case of M. hapla species. The materials used in this experiment were the eggs (egg sack) prepared as much alike as possible. The results of the egg-size measurements obtained are as follows: The Number of the egg production of the root-knot nematode which parasited on suitable host plants has been counted to be about 700~800 eggs in the case of M. incognita acrita and 550~650 eggs in the case of M. hapla. On the egg size of the root-knot nematode, M. hapla is smaller than other two species, M. incognita acrita and M. javanica (?). This difference in the dimension of the egg size seems to be the remarkable feature to identify the root-knot nematode. Any remarkable differences of the egg size between M. incognita acrita and M. javanica (?) was not recognized. M. hapla shows smaller quantities of the L-W ratio (egg length/egg width), than other two species. © 1957, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.