My tomatoes have brown spots. - Knowledgebase Question

west sacramento, Ca
Question by zanny925
June 27, 2007
Hi I asked a question about 4 days ago about my tomatoes, but no one answered yet. I wanted to know why my beefsteak tomatoes have big brown spots on the bottom of them, like there not fully growing on the bottom, and some of them are not not ripening to maturity. I would be thankful for some help to my question. thanks

Answer from NGA
June 27, 2007


I remember answering your question so the answer must have gotten lost in cyberspace! Your tomatoes have blossom end rot, a physiological condition caused by a lack of calcium at the growing tip of the fruit. While your soil may have adequate calcium, fluctuations in soil moisture content from dry to wet really increase the incidence of blossom end rot. It is especially bad on the early fruit each summer and in sandy soils. The damage occurs as cells die at the tip of the fruit. In time (and as the fruit grows) the spots enlarge and turn black. So, by the time you see it, the damage actually has already occurred some time back. Remedies include having a soil test to make sure calcium levels are adequate, adding organic matter to a sandy soil to increase its moisture holding capacity, keeping plants evenly moist, especially during the development of the first fruits (mulch helps maintain soil moisture), and spraying plants with a Blossom End Rot spray (contains calcium) which can usually be purchased from your local garden center.

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