Black spots on green tomato

yanjunlisaJune 25, 2010

We have two celebrity this year. They are planted in baskets not pot. And the fruits numbers are great but they all have some black spots on the end of the green tomatos. I compared the diseases with all the pics online and could not find the match.

We water quite often and there is a lot of sunshine.

Please help!

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It looks like a really weird case of blossom end rot (BER); sometimes BER can look strange on the outside.

If it is BER (I think it is), make sure that you aren't over-watering the baskets and make sure that you fertilize regularly (about once a week).

Also, assuming BER, this is caused by the plant's inability to move calcium evenly through the plant. Generally this happens when temps are too cool and/or watering is uneven (usually too much water). It's rarely due to a lack of calcium. However, since they are growing in containers, you need to use a good, water-soluble, general purpose fertilizer every week or so, since potting mix does not contain the nutrients and micronutrients that the plant requires.

Once you rectify that situation, the problem will go away with new fruits.

All the best.

    Bookmark   June 26, 2010 at 1:23PM
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torquill(z9/sunset15 CA)

What does it look like if you cut the fruit open? Do the black spots extend into the inside of the fruit, or are they only on the surface?


    Bookmark   June 29, 2010 at 1:17AM
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I think I am having the same problem.

My plants are in 14x12" tubs and I suspect I maybe overwatering.

The fruit shown is 1 1/3" across and also seems to be splitting at the blossom end , seeds exposed.

The other thing to note is most fruits with this problem have it where the fruit is touching the stem or a leaf.

I'll try to post a couple more pics if the system allows.

    Bookmark   February 11, 2014 at 2:34AM
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    Bookmark   February 11, 2014 at 2:59AM
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    Bookmark   February 11, 2014 at 3:21AM
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