tomato with a large white spot

Asked August 4, 2015, 9:12 PM EDT

I have two tomato plants in a topsy turvey planter. I used new potting soil when I planted them and there are many tomatoes on them and they are quickly ripening on the vines. Many of the tomatoes have a large white spot on the bottom of the fruit that develops when they begin to ripen. When I say a large white spot, I mean the bottom 1/4 to 1/3 of the tomato. When I cut into the fruit, there are no insects inside. What is the problem and what do I do about it?

Broomfield County Colorado

1 Response

I believe you have blossom end rot, which is very common this time of year. Basically, it is a deficiency of Calcium due to inconsistent watering. I have included a website through Cornell. If you do not find a picture that matches, can you send me a photo and I will look further?
http://vegetablemdonline.ppath.cornell.edu/NewsArticles/Tom_ComDis.htm