Abstract
The effects of temperature, dew, high relative humidity, and light regimes on teliospore germination, basidiospore production and germination, and infection of Noogoora burr (Xanthium occidentale) by Puccinia xanthii were examined. The optimum temperature for the germination of teliospores was between 20 and 30 C, and the optimum temperature for the production and germination of basidiospores was 20 C. The total number of basidiospores produced increased as the period under conditions of high relative humidity was increased. The highest levels of infection were observed at temperatures of 20 and 25 C []
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