Common orchid diseases and their prevention and treatment methods

Orchid Sclerotium rot

symptom

The disease is most serious when watering is too wet or ventilation is poor, especially young seedlings that have just been planted are most susceptible. Brown spots will appear at the infected site, which will expand rapidly in a hot and humid environment and eventually appear as dark brown spots.

Prevention and treatment methods

Attention should be paid to ventilation and light transmission, and the potting soil should have good drainage to prevent the disease. After the disease occurs, the contaminated potting soil can be removed and pentachloronitrobenzene powder or lime can be sprinkled on it.

Orchid Anthracnose

disease

Plants are susceptible to diseases due to dense planting, poor ventilation, water imbalance or injuries.

In the early stage of the orchid disease, obvious brown sunken spots will appear, which will then gradually expand to form round, irregular lesions. In severe cases, gangrene will appear in the center of the lesions.

Prevention and treatment methods

Do not plant too densely. Increase light and ensure good drainage and ventilation.

To cultivate strong seedlings, do not move the plants frequently to avoid damage and disease. Apply more phosphorus and potassium fertilizers to enhance the plant's disease resistance.

Cut off the diseased leaves promptly and apply 1/500 times of raw water solution and 1/800 times of fungicide to the wound. Spray 1/1000 times of thiophanate-methyl or carbendazim solution once a week.

Orchid leaf blight

disease

Small black spots appear on the leaf tips and gradually expand into irregular spots. The edges of the spots become dark brown and the middle is light gray-brown. In severe cases, they spread to the entire leaf and finally wither and fall off.

Prevention and treatment methods

Remove the diseased leaves and spray 500 times of Dasheng-45 or 1000 times of Haoshengling.

Diseased plants should be protected from rain or watering should be stopped to prevent the disease from worsening.

Spray 500 times Dasheng-45 regularly every day as a preventive measure.