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Morphological examination and measurements of life cycle stages of cereal cyst nematode populations collected from widely separated parts of Australia failed to show differences distinguishing them from Heterodera avenae Woll. A yellow phase during cyst maturation and blackening of infection sites on mature cereal plants was observed. Both occurred with a population from Woburn, England as well as with Australian populations. An underbridge-like structure was observed in females and light brown cysts of all populations but dark brown cysts lacked an underbridge.
McLeod et al. (1977) studied this question.