Orchid roots turning black
You may not be familiar with the knowledge topic of orchids, a member of the Orchidaceae family. When orchid roots turn black, the following article will provide an introduction.
There are various reasons for orchid roots turning black, and it cannot be judged unilaterally what caused them. Orchid enthusiasts can refer to the following information for judgment.
1. The part where the leaves connect to the bulbous section is generally called the leaf base or leaf sheath. If the leaf sheath turns black, it indicates that bacterial infection has caused stem rot, which requires high attention. You can immediately use agricultural chloramphenicol, streptomycin 2000 times solution, or carbendazim 500 times solution to spray and irrigate the leaf base and bulb. Alternatively, you can choose a broad-spectrum fungicide, 70% stem rot spirit emulsion.
Usage: Use this medicine at a concentration of 600 times (the amount can be determined based on the number of orchids you have) once every 7-10 days, spray consecutively for 4 times, and then spray preventively every 15-20 days based on the situation; during the high-temperature period from April to October, use this medicine for prevention.
2. If the roots turn black, it is mostly caused by excessive watering and poor aeration of the planting material. This situation is usually due to improper management, and enthusiasts can investigate various causes such as excessive watering, fertilizer damage, improper water use (acidity and alkalinity, polluted water), and improper proportioning of the planting material.
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