Caused by a calcium deficiency or something–Down here it basically means that the plant has to evapotranspirate (aka sweat) a bunch of water because the plant got too much water at some point. Plants sweat through their leaves, so after heavy rains the plants suck up a bunch of water, but then send all of it to the leaves and therefore all the nutrients end up in the leaves instead of the fruit.
Usually the solution is to just not water as much…but of course there are always those stupid rain storms that go and dump 4″ of water. I had a problem with it for the 2 years I had tomato plants in the ground without good drainage–I didnt’ have a problem with it last year which was the first year I had plants in raised beds.
Hopefully it won’t affect the others. The cherry tomatoes (other than the ones attacked by bugs) have been beautiful and delicious although they are in a different bed. I grilled some of the cherry tomatoes the other night with shrimp and sausage (recipe link below). I highly recommend it for the carnivores out there!
I grind up a calcium tablet and sprinkle it into the hole before I plant my plants. It helps some but I occasionally get a first fruit with it. You probably won’t have any other problems with it. Later on when we get a lot of rain the fruit will just split.
Hmm, that is a good idea. One of these days I am going to get around to scanning my soil report and posting it for advice. It was actually pretty good because the previous farmers used tons of manure when amending the soil.