1、 Stem rot

Symptoms: the infection of crab claw orchid with stem rot mostly occurs at the base of the stem. In the early stage of onset, there will be brownish green macula, and the disease spots are irregular. In the later stage, the disease spot will turn black brown. If it is sunken, the subcutaneous tissue will rot and dry, and there are black granules

Prevention and treatment method: during cultivation, the substrate must be disinfected before use to ensure that there are no bacteria in it. During management, pay attention to the amount and times of watering each time. Don't let the environment be too wet. Properly control the humidity. It's better to be dry than wet. In addition, in the early stage of the disease, we should spray mancozeb to avoid further infection

2、 Leaf spot

Symptoms: leaf spot disease mostly starts from the edge of leaves. At the initial stage, it is gray spots and slightly concave downward. After later expansion, the edge will be dark brown, and the later disease spots will slowly dry up, and gray black mildew spots will appear

Control method: once it is found to be infected with leaf spot disease, the diseased leaves should be removed in time to reduce the source of infection. In addition, the drug should be used in the early stage of the disease. The drug can be 800 times the liquid of pentachloronitrobenzene bactericide, or directly apply it on the leaves

3、 Precautions

In order to avoid the infection of crab claw orchid, we should not only disinfect the soil, but also pay attention to the methods in management. Put it in a well ventilated place, especially in hot summer. Ensure good ventilation and reduce watering. Do not provide a muggy and humid environment, otherwise it is easy to be infected