After the apple was flooded, the root system was in anaerobic respiration state, which led to the underground root system rot. Yellow leaves, fallen leaves, fruit dropping, cracked fruit appeared in the early stage of light off the ground, and some had secondary branches and flowers. Fine roots suffocate and die, gradually involving big roots, leading to root rot. In severe cases, the cortex is easy to fall off, the wood becomes discolored, and dead branches appear in the crown or the leaves become green. In severe cases, the tree declines, or even the whole tree dies.

(Wei)