Abstract
The first stages of infection of wheat seedlings, and the subsequent development of infection through successive leaf sheaths, by the eyespot fungus, Pseudocercosporella herpotrichoides , are described. Direct inoculation of leaf sheaths with conidia did not result in successful infection within 4 weeks, although inoculation of coleoptiles was successful. Leaf sheaths were infected by the inward progress of the pathogen from infected coleoptiles. The stages of infection were microscopically similar on two wheat cultivars differing in levels of seedling resistance to eyespot, although development was quicker on the more susceptible cultivar during penetration of the coleoptile. A hypersensitive reaction on leaf sheaths was observed but was not related to differences in seedling resistance.
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