Tomato Disease - Knowledgebase Question

Irondale, MO
Question by gumbb
January 29, 1998
My garden is in full sun, the tomato plants are staked upright yet the bottoms of the tomato turn black. Is it the soil, water, or lack of minerals in soil?

Answer from NGA
January 29, 1998


What you describe sounds suspiciously like Blossom-end Rot, a disease aggravated by widely fluctuating soil moisture, high temperatures, too much nitrogen fertilizer, and a deficiency of calcium in the soil.

Have your soil tested and adjust the soil to a pH of 6.5 to 7.0. Don't over-fertilize, don't plant tomatoes where drainage is poor, mulch the plants with organic matter to help retain moisture, and try to ensure uniform soil moisture by watering deeply once every 7 to 10 days, making sure water penetrates at least 12 inches deep into the soil.

Better luck next year with your tomatoes!

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