Control of an Epidemic of Septoria Leaf Spot of Tomato by Resistance. T. H. Barksdale, Research Plant Pathologist, Vegetable Laboratory, Horticultural Science Institute, Agricultural Research Service, U.S. Department of Agriculture, Agricultural Research Center, Beltsville, MD 20705. Plant Dis. 66:239-240. Accepted for publication 18 May 1981. 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, 1982. DOI: 10.1094/PD-66-239.

Tomato breeding lines deriving resistance to Septoria leaf spot from PI 422397 were entered in a replicated field test to assess their performance during an artificially induced epidemic. The level of resistance was sufficient to maintain a foliage canopy over the fruit until harvest. Disease increase on resistant lines was slow by comparison with increase on susceptible cultivars, which were severely defoliated.

Keyword(s): epiphytotic.