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Herbicide Effects in Nematode Diseases

Authors
Publisher
Journal of Nematology
Publication Date
Disciplines
  • Biology
  • Medicine

Abstract

ABSTRACTS OF PAPERS PRESENTED AT THE TWENTIETH ANNUAL MEETING OF THE SOCIETY OF NEMATOLOGISTS SEATTLE, WASHINGTON 16-19 AUGUST 1981 ANNUAL ABSTRACTS, SOCIETY OF NEMATOLOGISTS 429 ABSTRACTS OF PAPERS PRESENTED AT THE TWENTIETH ANNUAL MEETING OF THE SOCIETY OF NEMATOLOGISTS SEATTLE, WASHINGTON 16-19 AUGUST 1981 ABDEL-RAHMAN, F. H. and A. R. MAGGENTI . The embryology and post- infection development of a new species of Meloidogyne. A new species of Meloidogyne (root- knot nematode) was found on the roots of the sedge (Scripus robustus) at Pompino Beach, California. Laboratory tests revealed that from the first cleavage to eclosion takes approximately 20 d at 20 C -+- 2 C. At eclosion it is the second-stage larva that emerges; one molt occurs within the egg shell. The second-stage larva is the infective stage; it was used in subsequent experi- ments to study the postinfection develop- ment at 20 C. Ten days following inocula- tion, second-stage larvae were developing but remained sexually undifferentiated. After 12 d, male and female larvae are dis- tinguishable; males have one gonad and females have two. The second and third molts occur within the cuticle of the second-stage larva. The third stage appears 14 d after inoculation and the fourth stage after 16 days. Both larval stages lack a stylet and therefore do not feed. In addi- tion, the esophagus and metacorpus are poorly developed. Young adult females are evident 18 d after inoculation. At this time the female is the same size as the fourth- stage larva; however, the stylet is now well developed, as is the valve in the metacorpus. The metacorpus is now considerably larger than in any previous stage. The adult fe- male is globose with the reproductive tract occupying most of the body volume. The gelatinous matrix, into which eggs are deposited, is first seen 27 d after inocula- tion. The first eggs are deposited into the matrix after 28 d. The number of eggs per m;~ss is appr

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