>> most of the fruit he is on this tree will not make it to the picking time. >> reporter: he has grown oranges in florida for 50 years but now his 5,000 acre farm is under attack. >> this one is diseased. how do we know that? >> if you cut across it and we can see the interior of it, the seeds in it are what we call dead and they will never mature. >> reporter: a bacterial disease citrus greenin