There are many reasons for this situation, mainly as follows. First, the permeability of soil is not good. Second, there is too much water and serious ponding. The third is that there are many pests in the soil. If there are three aspects, the root is easy to dry. Once found, deal with it immediately. If the situation is not too serious, the plant can slow down. However, if you delay for a long time and don't deal with it, there are more and more shriveled parts in the root, it may not be saved.
(1) first, take the plant out of the pot carefully and straighten out its roots.
(2) next, the root that needs to be cleaned shall be cut off. If you find that there are rotten heel and empty root, you can cut them off at the same time.
(3) after trimming, soak it in disinfectant for a while, such as carbendazim, potassium permanganate, etc. Time does not need to be too long, ten kinds of probably enough
(4) after the above steps are completed, it is necessary to put it in a cool and well ventilated place for about two days.
(5) after the air is well dried, replace the new soil and plant it. Attention should also be paid to the new soil, which is required. First of all, it is loose, breathable, with good drainage and more humus. Moreover, it is better to be sandy. Generally speaking, sapropel can be used. If possible, you can mix rotten leaf soil with river sand, and add some rotten organic fertilizer. Note that before replanting, it can be put in the sun for a day or two. In this way, it can effectively eliminate the bacteria inside, and can also drive away the pests.
