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Disease Detection and Losses

Effects of Tobacco- and Tomato Ringspot Viruses on the Reproductive Tissues of Pelargonium hortorum. B. A. Scarborough, Graduate Student, Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802, Present address of senior author: Star Roses, The Conard Pyle Co., West Grove, PA 19390; S. H. Smith, Professor, Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802. Phytopathology 67:292-297. Accepted for publication 23 September 1976. Copyright 1977 The American Phytopathological Society, 3340 Pilot Knob Road, St. Paul, MN 55121. All rights reserved.. DOI: 10.1094/Phyto-67-292.

Virus infection reduced the number of florets and increased the number of aborted buds per inflorescence. Florets of geraniums infected with tomato ringspot virus contained more aborted anthers and a greater percentage of nonviable pollen grains than did florets of healthy and of tobacco ringspot virus-infected plants. Plants infected with tomato ringspot virus when self-pollinated, produced fewer fruit per pollination, seed per pollination, and viable seed than did healthy self-pollinated plants. Though both tobacco and tomato ringspot viruses were transmitted to the seed through the maternal tissue, only tomato ringspot virus was transmitted by the pollen.