#11 Bulls-eye Circle On The Blossom End
A mushy, bulls-eye circle on the tomato may be a sign of a nasty fungus known as anthracnose. The best way to avoid this condition is to switch to a drip irrigation system that waters the roots not the foliage of the plant.
Tomatoes may look great and ripen on time but you find something strange when you slice into the fruit. There are large open spaces with very little fruit. This condition is caused by lacking nutrients, poor soil, or inadequate pollination. Be sure that you are feeding your plants during the growing season. Keep in mind that tomatoes are heavy feeders and a frequent top dressing of homemade compost or compost tea is necessary for healthy fruit.
#13 Holes in Fruit
Your tomatoes may have small holes that collapse when you pick them up. This could be from tomato fruit worms. The moth larvae make a hole in fruits and begin eating from the inside out. Once the larvae have made a hole the only thing you can do is destroy the fruit that is infected. If you have consistent trouble with fruit worms try starting your planting under row covers, keeping them covered until they flower.