Factors Affecting Infection of Wheat Seedlings bySeptoria nodorum

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Abstract
Coleoptile infection of wheat by S. nodorum occurred over broad ranges of soil moisture, temperature and planting depth. Increased frequency of watering significantly reduced the severity of the disease in seedlings. However, low soil water potentials, obtained by equilibration with polyethylene glycol solutions through dialysis membranes, did not enhance disease development. Seedlings became infected at temperatures of 10, 15, and 20.degree. C in growth chambers. Sowing depths of 2.5, 5, and 7.5 cm in a gravel Peat-lite medium did not significantly affect seedling infection. There was a close positive correlation between percent seed infection and percent diseased seedlings. Increasing the concentration of the spore suspension used to inoculate the seed, from 103 to 106 spores/ml, increased percent seedling infection from 90 to 100%. High inoculum density on seeds resulted in more diseased and more severely diseased coleptiles. Disease severity of seedlings increased until 4 wk after sowing.

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