tomatoes are rotting on the vines before ripening--- not blossom end rot. Vines are lush and the fruit is plentiful
Kent County Delaware
If you are sure it is not blossom end rot, plus there is no insect damage and the plants appear healthy, the problem still may be weather related. Fluctuations in soil moisture, extreme temperatures and excessive rains contribute to the improper ripening of tomatoes. There are reports of Late Blight on tomato plants in DE. A sample can be submitted to your county Extension office for analysis.