My tomatoes have small black lesions about size of a dime which turn necrotic...
My tomatoes have small black lesions about size of a dime which turn necrotic as they ripen. I have not used pesticides or fertilizers. Lesions do not appear on all fruit. I'm wondering what this is and if I should avoid planting tomatoes next year in this same spot. It is full sun location, fertilized initially with aged cow manure and watered mostly by natural rain water. Thanks.
We notice uneven ripening in your photos as well as possible insect/animal damage. Uneven ripening can occur for several reasons such as cold temperatures; varietal characteristic-especially on large fruited and plum type varieties; and weak unthrifty plants which includes poor soils and plants too crowded or neglected. You can harvest tomatoes as soon as you see a blush color and let them ripen on your counter.
Also, if the tomatoes were subject to insect/animal damage that section can lead to a brown necrotic spot and rot. All you can do is cut that section out.
It is a good idea to rotate your crops if you have a large enough location. See our vegetable profile on tomatoes for growing information http://extension.umd.edu/learn/vegetable-profiles-tomatoes