Inoculation Technique to Screen for Bacterial Speck Resistance of Tomatoes. D. A. Emmatty, Agricultural Research Department, Heinz U.S.A., Bowling Green, OH 43402. M. D. Schott, and B. F. George, Agricultural Research Department, Heinz U.S.A., Bowling Green, OH 43402. Plant Dis. 66:993-994. Accepted for publication 22 February 1982. Copyright 1982 American Phytopathological Society. DOI: 10.1094/PD-66-993.

Seedlings of susceptible tomato cultivars, inoculated by dipping the cotyledons in a suspension of Pseudomonas syringae pv. tomato, were killed within 12 days. However, the resistant cultivar Ont. 7710 exhibited only cotyledonary lesions and was not killed. These lesions resulted in slight stunting of 12% of the plants 18 days after inoculation, and the rest were healthy. This technique can be used for the automatic elimination of susceptibles in a segregating population.

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