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SUMMARY
Urediospore release was studied with a Kramer-Collins spore sampler at the Waite Agricultural Research Institute, Australia, in three rusts: Melampsora euphorbiae on Euphorbia peplus, M. lini on Linum (cult.), and Puccinia pelargonii-zonalis on Pelargonium zonale. Diurnal periodicity was found in all species with maximum numbers occurring near midday.