Description and SEM Observations of a New Species of Cyst Nematode Heterodera goldeni (Nematoda: Heteroderidae) Attacking Panicum coloratum in Egypt

Zafar A. Handoo, I. K. A. Ibrahim

Abstract


A cyst nematode, Heterodera goldeni n. sp., is photographed and described from Qasabagrass roots (Panicum coloratum L.) in Alexandria, Egypt. It is characterized in having second-stage juveniles with body length of 546 µm (450-612), stylet length of 22.6 µm (22-23.5) with anchor-shaped knobs, lateral field with 3 lines, tail 60-75 µm, hyaline tail terminus 38.4 µm (33-43); cysts are lemon-shaped, dark to light brown with an extensive sub-crystalline layer covering the entire cyst, cuticular midbody pattern zig-zag, cysts ambifenestrate, well-developed underbridge with finger-like projections, bullae present, vulva slit measuring 44-48 µm long. Males are absent, and females have heavy punctations on the cuticle. Its relationship to H. graminophila described from Florida and Louisiana and H. leuceilyma described from Florida are discussed. The present known distribution is restricted to Alexandria, Egypt. Its economic importance in rangeland grasses and cultivated crops such as rice is not known.

Keywords


alexandria; cyst nematode; egypt; heterodera graminophila; h. leuceilyma; morphology; panicum coloratum; qasabagrass roots; scanning electron microscopy; taxonomy

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