The roots of orchids are blackened.

There are many kinds of orchid root blackening, and can not be a unilateral judgment of what causes, flower friends can refer to the following information to judge.

1. The part of the leaf connecting the bulb is generally called the leaf base or the leaf sheath. If the leaf sheath is blackened, it indicates that the stem rot caused by bacterial infection must be taken seriously. Agricultural chloramphenicol, streptomycin or carbendan 2000 times solution can be used immediately to spray, irrigate the leaf base and corm. Or choose the universal agent 70 Stem Curin EC.

Usage: use 600 times of the medicine (the dosage can be determined according to the number of orchids) 7 Mel once every 10 days, spray 4 times in a row, and then spray once every 20 days according to the situation; in the high temperature period from April to October, the drug is used for prevention.

2. If the root is blackened, it is mostly caused by large water and poor air permeability of the plant. Most of this situation is caused by improper management. Flower friends can investigate from many reasons, such as water responsibility, fertilizer damage, improper use of water (pH, polluted water), improper proportion of plant materials, and so on.