Common diseases of orchids and their control methods

Orchid is one of the most famous flowers in China. The orchid is elegant and elegant, and its shape is small and exquisite, so it is called the gentleman in the flower. However, after the occurrence of diseases and insect pests in orchids, the ornamental value of flowers is greatly affected. The common diseases and insect pests of orchids are white silk disease, anthracnose and leaf blight.

White silk disease of orchid

Symptom

The disease is the most serious when watering is too wet or poor ventilation, especially the newly planted seedlings are the most vulnerable. The infected site will produce brown spots, which will expand rapidly in a hot and humid environment, and eventually show black and brown spots.

Prevention and cure method

Should pay attention to ventilation and light, basin soil drainage is good to prevent, after the disease can be removed with bacteria basin soil, sprinkled with pentachloronitrobenzene powder or lime can be.

Anthracnose of orchid

Disease symptoms

Planting is too dense, poor ventilation, moisture imbalance or injury wounds and other susceptible diseases.

At the beginning of the disease, the orchid plant will appear obvious brown sunken spots, and then gradually expand to form a round irregular spot, and in severe cases, gangrene will appear in the center of the spot.

Prevention and cure method

Don't plant too closely. Increase lighting to ensure good drainage and ventilation.

Cultivate strong seedlings, do not often move plants, so as not to cause damage and disease. Increase the application of phosphorus and potassium fertilizer to enhance the disease resistance of the plant.

Cut off the diseased leaves in time and smear the wound with 500-fold raw water solution and 800-fold bacteriolysis. Spray 1000 times thiophanate methyl or carbendazim solution once a week.

Orchid leaf blight

Disease symptoms

The tip of the leaf produces small black spots, which gradually expand into irregular disease spots, which form dark brown around the disease spot, light grayish brown in the middle, spread the whole leaf in severe cases, and finally wither and fall leaves.

Prevention and cure method

Remove diseased leaves and spray 500x Dasheng-45 or 1000 times good life.

Susceptible plants should avoid Rain Water or suspend watering to prevent the disease from getting worse.

Spray 500 times Dasheng-45 regularly once a day as a precaution.