Buenos días disculpen alguien podría decirme qué enfermedad es ésta

Hi Jorge Mora ! This is Zippering of tomatoes. Zippering usually occurs when the anther of the tomato flower sticks to the developing fruit and produces a scar as the fruit grows, extending from the blossom end to the stem. Sometimes an open hole develops in addition to the scar. The only control is to select varieties that are less prone to zippering (Look-alikes: Catfacing, growth cracks). For your reference I have uploaded pic of zippered fruits of tomato. Thanks for visiting plantix community

Calcium Deficiency

Dr. V Pandey عفن الطرف الزهرى ينتج عن نقص الكالسيوم

Yes you are absolutely right. Blossom end rot is result of Calcium deficiency

Buenas noches, les agradezco su gran conocimiento trabajo para un grupo asociativo y no tenemos experiencia, pero contamos amigos alguien me puede echar una manito?

Hi Jose Heverth Herrera Viuchy ! In First pic one tomato shows injury or scratching. In the second pic the symptoms resemble blossom end rot, but such symptoms also appear when the fruit is in contact of wet soil for long time. Third pic is not clear from this angle whether it is insect damage or fruit split. Pl check again and take appropriate steps accordingly All the best

Great effort Deica for your upvote