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by Rachel
(Shelby, Ohio, USA)
Q. The majority of the tomatoes on my 16 tomato plants are getting these large rotten spots on them before they are ripe. Does anyone know what could be causing this? Is there anything I can do to save my tomato crop this year?
A. Looks like a classic case of blossom end rot (BER). This common tomato problem appears on the bottom side of the tomato (either a green or ripened one) develops a sunken, leathery dark brown or black spot.
It's caused by a calcium imbalance. Tomatoes absorb calcium through water. But calcium isn’t fast-moving.
If a tomato grows quickly, or if other conditions slow water absorption, then calcium doesn’t have enough time to travel through the whole piece of fruit.
Plants can’t absorb enough calcium – whether or not there’s enough in the soil.
A tomato’s tissues break down and leave the telltale damage on its bottom.
Prevention is the most method of control (see below).
Blossom end rot cannot be reversed on a tomato once it’s set in, but you can take these steps to slow and halt it.
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