blossom end rot
Tomato Problem Solver Texas A&M AgriLife Extension Service provides many pictures to help you diagnose and treat your tomato disease problem(s).
You can’t treat your diseased tomato plants if you don’t know what disease they actually have. The secret to successful tomato growing is to check your plants daily and start a treatment plan as soon as you see the first signs of a disease or insect problem.
Source document: University of Iowa has a great fact sheet on line with photographs and treatments for many common tomato diseases.
You may find what you thought was a disease problem is really an insect infestation. If this is the case take a look at… Clemson University fact sheet for insect identification and controls.
Not from the USA. Please leave me comment about your home town and country.
Why is common sense so uncommon?
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Town & Country Gardening 
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