What is the disease of having black spots on the leaves of orchids

Black spots on the leaves of orchids are caused by anthracnose. The diseased branches and leaves need to be cut off and burned. It can be sprayed with chlorothalonil, or the plant can be taken out of the basin and soaked in topiramate solution. Replant after disinfection, water thoroughly and put in a cool place. Spray every few days to prevent recurrence. Anthrax is mostly caused by environmental problems, usually need to pay attention to ventilation and dehumidification.

First, what is the disease?

There are black spots on the leaves of orchids, usually caused by anthrax. The disease initially produces black spots on the leaves, which is small at first, then slowly expands, and eventually causes the entire leaf to dry up. As one of the common diseases, in addition to treatment, but also need certain prevention and treatment methods.

Second, how to treat it

1. Pruning diseased leaves: cut off all the black-spotted leaves of orchids. As anthrax spreads easily, it is important to avoid the presence of diseased leaves. After cutting off the diseased leaves, do not discard them casually, it is best to burn them collectively, which can also be effectively sterilized.

2. Drug sterilization: in addition to germs on the leaves, there may also be residues of bacteria in the potted soil of orchids. Need to use chlorothalonil and other spray treatment, if the situation is serious, the plant needs to be taken out and soaked in Topurazine solution for disinfection.

3. Replanting and conservation: sterilized orchids can be replanted in new pots and new soil to avoid further infection. Water thoroughly after replanting and put it in a cool and ventilated place. Do not spray water for a short time, which is not conducive to wound healing. After that every few days spray disinfection, generally 20 days or so can be completely cured.

4. Follow-up prevention: the cause of anthrax in orchids is mainly due to poor environment. Need to strengthen the ventilation of the environment to avoid poor air circulation, but also appropriate to reduce humidity, air humidity is the key to the breeding of bacteria, you can put some desiccant indoors to reduce humidity.