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Vegetable GardensBlack Spots
» Sally125 - tomatoes In response to tomatoes posted by JA4377DE:This answer about black spots on tomatoes is from New York University Agricultural Experiment Station, in conjuntion with Cornell University. Q: What causes a big black spot on the blossom-end of my fruit? "A: The problem is called Blossom-End Rot (BER) and is caused by a lack of calcium within the fruit. When calcium reaches low levels in the tomato, the fruit simply dies back at the bottom leaving the characteristic black or brown spot. Calcium is present in most soils in adequate amounts. The problem is that the plant cannot absorb enough calcium through its roots because of dry soil conditions. That's because calcium is taken up by the roots along with water. If, for some reason, water uptake is restricted, calcium uptake will stop. What can you do about it? Have your soil tested to make sure you have enough calcium in the soil. If you don't, add either limestone (if the soil's acidity level or pH is below 6.0) or gypsum. If calcium levels are adequate, the most important control measure is to maintain optimum soil moisture. Whenever tomato plants are allowed to experience the slightest bit of water stress, you are causing BER. To maintain good soil moisture, try using a mulch of straw, leaves, or even grass clippings to prevent evaporation. Tomatoes need about one inch of water per week as a minimum. If you do not get this through rainfall, you will need to apply the water As a rough estimate, each tomato plant needs approximately 3-5 gallons of water each week. If you use a mulch, this amount may be cut in half. When watering, don't lightly sprinkle the ground. Apply the water so it enters the ground and moves through the soil to a depth of 8-12 inches. Shallow watering only encourages shallow rooting which leaves tomato plants more prone to wilting." -- posted by Sally125
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