Levels of Tomato Anthracnose Resistance Measured by Reduction of Fungicide Use. T. H. Barksdale, Research Plant Pathologist, Vegetable Laboratory, Horticultural Science Institute, Beltsville Agricultural Research Center, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Beltsville, MD 20705. A. K. Stoner, Research Horticulturist, Vegetable Laboratory, Horticultural Science Institute, Beltsville Agricultural Research Center, Science and Education Administration, Agricultural Research, U.S. Department of Agriculture, Beltsville, MD 20705. Plant Dis. 65:71-72. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-71.

Chlorothalonil was applied one, two, three, four and eight times during the growing season to five anthracnose-resistant tomato breeding lines and two susceptible check cultivars. Yields of resistant lines, and of cultivars were comparable and were increased by fungicide application. Based on reduction of fruit rot, the levels of resistance in the lines were equal to the control provided by three to seven fungicide applications.