What if the grapefruit leaves turn yellow?

1, check whether there are pests (red and yellow spiders: mainly distributed on the back of leaves, red or yellow like needles; Scale insects: mainly on leaves and young branches, rarely moving on them. These two kinds of pests, especially red spider and yellow spider, are easy to cause yellow leaves and fallen leaves. Local yellow leaves fall off.

2. Check whether the stem of the tree is damaged by longicorn beetles, mainly larvae of longicorn beetles. The stem is rotten and powder can be seen. It will make the whole yellow leaf fall off.

3. Check the roots for white silk (white silk disease). It will make the whole yellow leaf fall off.

Second, a small amount of yellow leaves is a normal growth phenomenon, which can be supplemented by topdressing.