Hadi Ghorbanzad - Department of Plant Protection, College of Agriculture and Natural resources, University of Tehran, Karaj, Iran.
Ramin Heydari - Department of Plant Protection, College of Agriculture and Natural resources, University of Tehran, Karaj, Iran.
Ebrahim Pourjam - Department of Plant Pathology, College of Agriculture, Tarbiat Modares University, Tehran, Iran.

In order to identification of plant parasitic nematodes associated with plants in fruit orchards of West Azerbaijan province, Iran, a survey was conducted during ۲۰۱۱ and ۲۰۱۲. Nematodes were extracted from soil and root samples by using centrifugal-flotation and Whitehead's tray, transferred to glycerin and mounted in permanent slides. Morphological and morphometrical characters of the specimens were analyzed and measurated. As a result, ۲۶ species belonging to ۲۱ different genera of tylenchids (Tylenchomorpha, Nematoda) were identified that are presented. Mesocriconema surinamense and Pratylenchoides crenicauda are reported for the first time from Iran. Iranian population of Psilenchus aestuarius is also illustrated here. M. surinamense ischaracterized by having a disk like head originated fromlarge submedian lobes of lip region and morphometic characters. P. crenicauda is the type species of the genus Pratylenchoides and distinguished by areolated lateral lines on the tail, short pharyngeal overlap and position of pharyngeal glands. P. aestuarius is characterized by rounded and smooth head, presence of post anal intestinal sac in both sexes and several morphometric characters.

First report, Mesocriconema surinamense, Pratylenchoides crenicauda, Psilenchus aestuarius