J.,
I'm not an allergist, nor do my kids have food allergies, however your post title intrigued me as I've never heard of "allergic to fruit". So I was wondering how you know it's THAT food? Also, was it canned or fresh?
I agree with the other post. Eliminate ALL possibilities. Canned versus fresh. Maybe it's the aluminum, sodium, etc. from the packaging. I believe Organic only means without chemical fertilizers/pesticides/and "natural" processing.
Also, consider an allergist. There are pediatric ones out there that specialize in this and I'm sure could offer you some piece of mind on your feeding issues. You don't want to feel like you're playing roulette with his foods.
Best wishes,
Sara