Physiological disorder

a) Bitter pit of apple:

  • Brown suken spot usually spherical in shape
  • Visible during early storage period

Apple (Malus spp.)-Bitter Pit | Pacific Northwest Pest Management Handbooks

b) Scald:

  • Storage disorder in apple
  • Darkening of mottled surface

Superficial Scald Management in Apples | WSU Tree Fruit | Washington State  University