tomatoes going black?

Question

most of my totatoes are turning black on the bottom only,someone says not enough water,someone else says too much,any positive ideas please

Answer 1

Dark brown or black blotches on the bottom of tomato fruit is a sure sign of blossom-end rot. This problem shows up in many home vegetable gardens each season, but there are steps which can be taken in late winter which will help prevent blossom-end rot in the next crop.

Before covering control measures for blossom-end rot, let's make sure you know what it looks like, since home gardeners sometimes confuse the problem with other tomato diseases. The first indication of blossom-end rot is a slight discoloration, water-soaked in appearance, occurring at the blossom-end (bottom) of the fruit. This area enlarges rapidly, producing a brown or black sunken area. The skin over the affected area becomes dry and leathery.

Blossom-end rot is caused by a shortage of calcium in developing fruit. This may be due to a lack of calcium uptake from the soil or to extreme fluctuations in water supply. Tomato plants growing in soils low in calcium and soils which are alternately wet and dry during fruit development are more likely to show blossom-end rot. Also, this problem generally is more severe when plants are fertilized too heavily with nitrogen fertilizer.

Blossom-end rot is also related to moisture supply, so during the growing season, don't forget to keep a close eye on your plants, monitor soil moisture, and irrigate before signs of moisture stress are apparent. As a general rule, during the growing season, tomato plants need at least one inch of water per week in the form of rain or supplemental irrigation.

Consider mulching your tomato plants, since this practice will help maintain uniform soil moisture conditions.

If blossom-end rot should begin to show up, apply several sprays of calcium chloride (available at garden supply stores under a variety of trade names). Follow label directions. Sprays containing calcium chloride will help to prevent further development of the problem but will not cure fruits already affected.

Remove fruit showing symptoms of blossom-end rot when the problem is first observed. This practice will reduce the drain of food and nutrient materials which otherwise would be available for development of other fruit not affected by blossom-end rot.

It's especially important to follow a recommended program of fertility and avoid excessive application of nitrogen fertilizer.

Answer 2

It is just as simple as this ...
Inconsistent watering. I had the same problem.
Tomato Turn Black on the Bottom
Q. Why are some of my tomatoes getting dark rotten spots on the bottom of the fruit?
blossom end rot" (BER), 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 BER.
Photo courtesy of T.A. Zitter, Cornell University, Ithaca, NY
http://vegetablemdonline.ppath.cornell.edu/PhotoPages/Tomatoes/Tom_BlossRot/Tom_BlossRot1.htm
This is what I did I bought some of these placed as directed and followed a regime for watering everyday about the same time and amount.
They snapped out of it.
Jobes Tomato Fertilizer Spikes
http://lawn-and-garden.hardwarestore.com/77-498-fertilizer-spikes.aspx
$2.29
bought mine at walmart.

Answer 3

If I'm not mistaken (and I could be!) but I think it's called just that..water rot. And it comes from too much water at the wrong time for the tomato's developement. I have figs that react in a similar way to water at the wrong time.. and other than keeping them up and off any wet soil, I'm not sure there's anything you can do about it this year.

Answer 4

Tomatoes turning black on the bottom is actually blight . Tomato leaves develop dark spots but the main damage is on the fruits which develop irregular, dark brown to black spots and eventually cover the whole fruit, and are unusable.
This is a serious disease. It only becomes troublesome during periods of warm wet weather, and if not treated can spread to the whole crop. Spray with Zineb at the first sign of infection and repeated at 10 to 14 day intervals during warm humid weather.

Answer 5

Its definately not enough water, letting them dry out too often. prove it by picking off all the black end ones and then water daily regardless if they seem wet enough. from then on they will ripen perfectly.
Its called 'blossom end rot'

Answer 6

my toms are all over already
too much rain, try some feed