Ok Dan, here are the particulars:
Any help is greatly appreciated.
- Percy R.
The holes are caused by a caterpillar called the tomato fruit worm. Spraying your tomatoes once a week with insecticides to control caterpillars, such as BT, spinosad (these first two are organic options), carbaryl or permethrin, will keep this damage to a minimum. Begin spraying early in the season when you see the first sign of damage or before.
These holes often allow secondary fungal infections that will rapidly rot the fruit. When you find a damaged fruit, bring it inside to ripen indoors where lower humidity and cooler temperatures reduce the chances of the fruit rotting before it ripens.
Consumer Horticulture Specialist
The LSU AgCenter and the LSU College of Agriculture