For nematode control, do not plant in soil where infected crops have been grown within the past two seasons. Examine the plants carefully for knots or galls on the roots. Verify presence of nematodes and dispose of transplants. Plant resistant tomato varieties. These fungi are widespread and present in the soil.
Fruits develop large, cracked, rotten spots.
Such spots are sometimes sunken and may have alternating bands of light and dark brown color. As spots enlarge, they frequently break open. To avoid soil rot, grow plants in well-drained soil. Use a mulch or stake plants to prevent fruit from touching the soil. Mosaic There are several virus diseases that affect tomatoes.