Factors Influencing the Susceptibility of Male‐sterile Barley to Ergot1

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Abstract
This study was undertaken to determine whether susceptibility of male‐sterile barley (Hordeum vulgare L.) to ergot [Claviceps purpurea (Fr.) Tul.] is influenced by characteristics of the host, fertilization, and inoculum density. A suspension of conidia (106/ml) was atomized into florets in which the lemma and palea had been clipped back to expose the pistil. Most of the 12 lines tested were moderately to highly susceptible with more than 25% of the florets infected.Inoculation at various times after hand pollination showed that 9 of 12 lines were immune to ergot infection by 5 days and all were immune by 8 days after pollination and fertilization. Some lines became immune much faster than others, with ‘Hoodless Beardless’8 msg1 msg1 developing immunity within 24 to 48 hours after pollination.Increasing the inoculum density from 104 to 106 conidia/ml increased the incidence of ergot. All five lines tested showed similar reactions to the different inoculum densities.

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