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Spore Release in Powdery Mildews. S. M. Pady, Professor of Botany, Division of Biology, Kansas State University, Manhattan 66502; Phytopathology 62:1099-1100. DOI: 10.1094/Phyto-62-1099.

Diurnal periodicity in several powdery mildews was studied in Australia from July to December 1969, with a Kramer-Collins spore sampler. In Sphaerotheca fuliginea on Cucumis, S. pannosa on rose, Erysiphe cichoracearum on Pentstemon, E. polygoni on Lathyrus, Podosphaera leucotricha on Malus, and Oidium sp. on Eucalyptus, spore release was periodic with peaks about midday.