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Parasitism of the Citrus Nematode, Tylenchulus semipenetrans, by Pasteuria penetrans in Iraq

Authors
Publisher
Journal of Nematology
Publication Date
Disciplines
  • Economics

Abstract

Parasitism of the Citrus Nematode, Tylenchulus semipenetrans, by Pasteuria penetrans in Iraq Journal of Nematology 21 (3):431-433. 1989. © The Society of Nematologists 1989. Parasitism of the Citrus Nematode, Tylenchulus semipenetrans, by Pasteuria penetrans in Iraq F. A. FATTAH, H. M. SALEH, AND H. M. ABOUD 1 Key words: biocontrol, citrus, Pasteuria penetrans, Ty- lenchulus semipenetrans. Pasteuria penetrans Sayre & Starr para- sitizes several nematode species and is con- sidered a promising biocontrol agent of the root-knot nematode, Meloidogyne spp. (1,7). Numerous plant-parasitic nematodes, in- cluding Tylenchulus semipenetrans, however, are seldom if ever infected by this biocon- trol agent (3). Tylenchulus semipenetrans Cobb is the most economically important and widespread nematode pest of citrus worldwide. In Iraq, it occurs in more than 90% of the citrus orchards and nurseries (4). Specimens of T. semipenetrans infected by P. penetrans were detected during routine collection of soil and root samples from T. semipenetrans-infected citrus trees at A1- Dorah, Baghdad. T. semipenetrans motile stages were extracted from soil and roots by a modification of Cobb's sieving and decanting method (6) and from sedentary adult females by maceration or dislodging. Nematode stages infected with P. penetrans were examined in a water suspension through a compound microscope. Only second-stage juveniles (J2) and adult males had P. penetrans spores affixed to their cuticles (Fig. 1 A-C). Juveniles with attached spores tended to aggregate in groups of 2-5 nematodes and stick to each other. Similar observations of Meloidogyne javanica were made (3). Received for publication 19 May 1988. 1 Scientific Researcher and Assistant Scientific Research- ers, Department of Plant Protection, Faculty of Agriculture and Biology, P.O. Box 765, Baghdad, Iraq. Endospores, sporangia, and other P. pen- etrans life stages were found inside the J2 bodies

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