T shaped marking on marble sized mango fruits and at later stages feeding on cotyledons is characteristic symptoms of

T shaped marking on marble sized mango fruits and at later stages feeding on cotyledons are characteristic symptoms of Sternochetus mangiferae.
Mango nut weevil grubs feed pulp, endocarp of marble sized fruits and cause 'T- shaped marking on the fruit surface and causes fruit drop.
Sternochetus mangiferae is a weevil commonly known as the mango seed weevil, mango stone weevil, or mango weevil. It is a compact weevil typical of the Cryptorhynchinae.
The adult female lays eggs on the surface of the mango fruit. Larvae and pupae develop inside the fruit and adults emerge, cutting their way out of the seed and pericarp after the fruit falls and decays.