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Infection of Sugarbeet by Cercospora beticola in Relation to Stomatal Condition. Y. Rathaiah, Laboratoire de Pathologie végétale, Institut National Agronomique Paris-Grignon, Centre de Grignon, 78850 Thiverval-Grignon, France, Present address: Department of Plant Pathology, College of Agriculture, Andhra Pradesh Agricultural University, Rajendra Nagar, Hyderabad-500030, India; Phytopathology 66:737-740. Accepted for publication 25 September 1975. DOI: 10.1094/Phyto-66-737.

New data indicate that Cercospora beticola was capable of penetrating sugarbeet leaves through closed stomata at night. An appressorium generally was formed over the stoma when the entry was made at night by way of a closed stoma, while no appressorium was needed with open stomata during daylight hours. Penetration and disease development were higher under nighttime wetting and daytime drying compared to daytime wetting and nighttime drying, and a continuous wetting regime of the same duration.