Why they are going like that not only one for a plant each and every fruit is going like that

Dear Somineni Malyadri It is fruit rot ( anthracnose ). Spray carbandazime. 1gm in one litre of water. About 300 to 350 litres of spray solution may be required per acre. Please take care to use proper concentration of pesticides and also mix the pesticide with water outside the sprayer equipment for better results. Good luck.

Spray Propiconazole 1 ml /L for immidiate result