Why do I have rotting (dark) spots on the base of my tomatoes? They are in an earth box.
Hardiness Zone: 10a
By Catherine from Port St Lucie, FL
Here are questions related to Brown Spots on Ripening Tomatoes.
My tomatoes, as they ripen, acquire a black/brown area at the base. What is this? and how can I prevent it?
By John P
Blossom end rot and it's caused by a calcium deficiency. You can buy stuff but a cheap and easy way to prevent it is to put a handful of crushed eggshells in the hole before you plant the tomato. The calcium feeds the plant all season and it doesn't cost a penny.
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My tomatoes are beginning to get color but on the bottom of each tomato is a brown spot that grows as the tomato ripens. The inside of the tomato at the bottom is black. Any ideas?
Hardiness Zone: 8a
Judy from Yelm, WA
Sounds like it could be a bad fungus infection. Is there any brown or rust color on the plant leaves? Check the underside especially as the brown/black seems to form only on the bottom of the fruit. If so, a mix of 1 tsp dish soap, 1 tsp baking soda in one quart of water sprayed on throughly and repeatedly should do the trick. No matter what; it's cheap and won't hurt the plants at all.
It would also be helpful if you could grow the plants in a drier, sunnier location if it's a mold. I just went through a rust problem on some lilies and this really worked well for me. (08/25/2008)
It is called "Blossom End Rot" and is caused by erratic watering schedules. The tomatoes are OK once you cut off the rot. (08/25/2008)
Also caused by lack of calcium in soil. I read that 2 to 3 months before planting tomatoes, mix some lime into soil. I myself am going to try this next year. Good luck (08/28/2008)
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I can't figure out why my tomatoes are turning black. I already watered them with Epsom salt a month ago. Can anybody help? I don't think it is bottom rot.
Hardiness Zone: 5a
By Joyce Wis from Janesville, WI
I have a friend who had the same problem, so he called the "Cooperative Extension" in his area, and they said it was a fungus or virus that hit throughout the area (N.Y. State). He had to pull up the plants and then bury them. (09/16/2009)
I had the same problem almost overnight. Happened right after the last big rain. Didn't affect them all on the same plant, weird. (09/17/2009)
It's blight. I had the same thing on some of my tomatoes. A lot of the community gardens had it here in Massachusetts. (09/17/2009)
It is blight, due to the excessive rain we have had. Some tomatoes are even falling off of the vine before they can get big too, a lot of people are dealing with this problem. (09/17/2009)