Abstract
The size of Peronospora tabacina conidia varied considerably under glasshouse conditions. Differences in host, whether of age or genetic constitution, were found to have no effect. Different pathogenic strains showed significant size variation. Single conidium inoculations were made to reduce the genetic variability of the second generation population, but the range of sizes was not significantly altered compared with multi-conidial inoculations. The only environmental factor to affect conidial size significantly was temperature where conidial size was found to increase as the temperature decreased, from 18·2 × 14·6 μ m at day-night temperatures of 30/25°C to 20·0 × 16·6 μ m at 15/10°C.
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