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Disease Note.

Fusarium Crown and Root Rot of Tomato in Pennsylvania. M. D. Ricker, Campbell Institute for Research & Technology, P-152 Road 12, Napoleon, OH 43545. Plant Dis. 71:469. Accepted for publication 30 January 1987. Copyright 1987 The American Phytopathological Society. DOI: 10.1094/PD-71-0469C.

In 1985, Fusarium oxysporum Schlecht. f. sp. radicis-lycopersici Jarvis & Shoemaker (FORL) (2) was isolated from Dombito tomato plants (Lycopersicon esculentum Mill.) growing in a greenhouse in Washingtonville, Pennsylvania. Ten percent ofthe fruit-bearing plants wilted suddenly during sunny days and eventually died. Symptoms included extensive root decay, stem girdling, and vascular discoloration that extended no more than 13 cm above the soil line. The pathogenicity of the fungus was confirmed through inoculations of 20 plants each of four cultivars. Plants were examined 2 mo after root-dip inoculations with 1.5 X 106 macrospores and micros pores per milliliter. Percentages of plants with vascular discoloration were 100, 100, 90, and 0, respectively, for the cultivars KC 135 (susceptible to races 1 and 2 of F. O. f. sp. lycopersici [FOL]), Easy Harvest (resistant to race I of FOL), Walter (resistant to races I and 2 of FOL), and Larma (resistant to FORL and races I and 2 of FOL). This appears to be the first report of Fusarium crown and root rot of tomato in Pennsylvania. The disease has previously been reported from greenhouses in Ohio, New Hampshire, and Texas and from fields in Florida and California (1).

References: (1) L. W. Barnes and R. D. Martyn. Plant Dis. 69:1100, 1985. (2) R. C. Rowe. Phytopathology 70:1143, 1980.