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Zippering (fruit disorder) on tomatoes. This disorder (abiotic disease) happens when the flower anther sticks to the developing fruit as it grows. Characteristic symptom is a thin brown longitudinal scar with transverse scars resembling a zipper. It extends down the fruit. There may be more than one scar on a fruit. An open hole may develop next to the scar.
Overfertilizing with nitrogen fertilizer may result in an excess of leaf growth, to the detriment of flower production. If your tomato plant is producing lots of fruits, it may drop new flowers in an effort to conserve energy for existing fruits. In extreme weather, there may simply be no insects to pollinate the plant. Tapping the flowers gently can help release pollen into the wind.