SUMMARY British pathotype 3 of cereal cyst‐nematode differs morphologically from Heterodera avenae. Mature cysts have a distinct underbridge which is absent from pathotypes 1 and 2. A population of pathotype 3 produced cysts on cereal genotypes resistant to pathotypes 1 and 2. The relationship of this pathotype to other graminaceous cyst‐nematodes is discussed.
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R. Cook (1975) studied this question.
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