Blossom end rot symptoms begin as a small, water soaked light brown spot at the blossom end of the fruit. The symptom typically appear during period of inadequate or excess soil moisture.
As the fruit grows the spot will also enlarge and may eventually cover up to half of the fruit. Saprophytic fungi and bacteria may attack the damaged tissue causing tissue discoloration and rotting.
The internal region of a fruit with blossom end rot shows the rotten section is internal to the fruit also, thereby affecting the whole fruit in later stages of symptom expression.