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Resistance to Powdery Mildew in Tobacco Induced by Peronospora tabacina. Yigal Cohen, Senior Lecturer, Department of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel; Moshe Reuveni(2), and R. G. Kenneth(3). (2)M. Sc. Student, Department of Life Sciences, Bar-Ilan University, Ramat-Gan, Israel; (3)Associate Professor, Department of Microbiology and Plant Pathology, Faculty of Agriculture, The Hebrew University, Rehovot, Israel. Phytopathology 65:1313-1315. DOI: 10.1094/Phyto-65-1313.

Tobacco plants (cultivar Michal) inoculated with Peronospora tabacina exhibited a complete resistance to Erysiphe cichoracearum. Eighteen days after exposure (at 20 C) to air-borne conidia of E. cichoracearum, 1.3 and 288.3 pustules of powdery mildew per plant developed on Peronospora-inoculated and on control (noninoculated) plants, respectively. It is assumed that the biochemical changes induced by Peronospora in tobacco plants protect them from a secondary infection with powdery mildew.