help!! just moved to florida nad tried to grow a garden this year. started with the (normally) simple tomatoe garden.

problem is when after the plants start to produce the fruit, the plants dies off very rapidly. before that, the plants grow big and look very healthy. got me so excited to see tham take off like that. then came the tomatoes and that was followed closely by the grim reaper.

have also planted some peppers, squash, and cucumbers which have been doing very well. any help?????????