Disease prevention and control methods of Cymbidium

Sclerotium rolfsii

Symptoms

It is usually released in hot and humid places. It often occurs on seedlings, infecting the roots and leaves. After the infection period, its unique white hyphae will appear at the junction of the base of the rhizome and the planting material. When the pathogen enters the base of the stem, the leaves are very easy to fall off.

Governance

Spray the cultivation medium with 1000 times of 1.50% toxin wettable powder, 3000 times of 2.50% fordonin wettable powder, or 1000 times of 3.75% mebutrin wettable powder. Stop spraying water for 5-7 days after spraying. The diseased leaves, diseased plants and nearby planting materials should be removed and burned, and nearby plants should be sprayed with control agents more than 3 times immediately.

anthrax

Symptoms

It can occur throughout the year, and the pattern of occurrence is that the plants become larger, ventilation is poor or management is improper, and it is more serious when the temperature is high and humidity is high. After the leaves are infected, small needle-shaped faded spots will appear and gradually expand. The color of the spots will gradually deepen and dark brown spots will appear in the later stage. Most spots will heal into irregular large spots, causing the leaves to wither and fall off.

Governance

Spray 2500 times of 25% poker la emulsion or 6000 times of 50% poker la manganese wettable powder. Cut off the diseased leaves and apply high-concentration medicine solution to the wounds. Apply potassium fertilizer moderately, apply fungicides reasonably, and apply pesticides in the early stages of the disease, but be careful to prevent pesticide damage. The cultivation environment needs to be improved to ensure good ventilation, lower humidity and reduce the spread of diseases.

Soft Rot

Symptoms

It is easy to be infected in a humid and high-temperature environment, usually infecting the leaves, causing the whole body to turn brown and become soft and rotten, and even the whole plant may die.

Governance

Pay attention to ventilation and adjust the indoor humidity. When diseased leaves are found, they should be removed in time and burned in a concentrated manner. The tools used should also be cleaned to prevent bacterial invasion. For drug control, initially spray 800 times diluted 77% Kesaid microparticle wettable powder and 4000 times diluted 72% agricultural streptomycin sulfate soluble powder, spray once every 7 to 10 days, and spray 1 to 2 times.

Physiological diseases

Symptoms

Due to unsuitable environmental conditions, such as temperature, humidity, and many other factors. Symptoms of the disease include root rot, yellowing leaves, leaf burns, and blackening of leaves after frost damage.

Governance

Find the cause, prescribe the right medicine, make up for the deficiencies, provide all the conditions needed for the growth of orchids, and strive to create an environment suitable for its growth. Pay attention to adjusting the light temperature, humidity, pH, and ventilation according to different seasons and different times of the growth period.