I have noticed that on my San Marzano lungo fruit about 20% of them are suffering some sort of rot or bruising damage. I know paste tomatoes come with their own set of issues BER etc... could this be some sort of virus? This is only happening on the San Marzano none of my other tomatoes are showing any of the same symptoms. The plants are strong, productive, and showing no signs of disease, only the fruit. Any advice? Thank You.