some of my plum tomatoes have about a 1/4"blacked ringed hole. When I dig into the hole there is tiny 1/8 th " maggot. other fruit have a blistered looking patch or sometimes trail. Please help.
Where are you seeing the holes -- do they tend to be concentrated on a particular part of the fruit?
What color is the 'maggot'?
Here is a link that might be useful: pest management and diagnosis