It is not uncommon for people with pollen allergies to have allergic reactions to certain fruits and vegetables. However, this is not considered true food allergies, but rather as a manifestation of oral allergy syndrome, sometimes known as pollen-food syndrome. Thy symptoms are very similar: itchiness, tingling or swelling of the mouth, tongue and throat immediately after eating fresh fruits, vegetables and certain kinds of other foods. In some cases, severe swelling and even a systemic reaction may occur, subsequently causing breathing problems.

If you have ragweed pollen allergies, beware of bananas, cucumbers, melons, zucchini, sunflower seeds, chamomile tea and Echinacea.

If you have birch tree pollen allergies, you might manifest allergy symptoms upon eating peaches, apples, pears, cherries, carrots, hazelnuts, kiwi fruit or almonds.

Here's a more detailed discussion on oral allergy syndrome from the Canadian Food Inspection Agency.