Black spots and blackish areas inside potatoes after rainy seasons are typically signs of various issues caused by excess moisture. These can include black heart (internal discoloration due to lack of oxygen in waterlogged soil), hollow heart (dark cavities from rapid growth and uneven water availability), fungal diseases like early or late blight, and bacterial soft rot (blackening and softening of tissue). These problems are often exacerbated by poor drainage and excessive moisture during wet periods, highlighting the importance of proper soil management and drainage in potato cultivation, especially during rainy seasons.

Blackheart-It caused by lack of oxygen, leading to dark, necrotic cavities. Can occur during tuber development or storage. Increased temperature can intensify blackheart, especially after vine kill and when soils are saturated.