Causes and Control methods of soft Rot of Orchid

After the orchid suffers from soft rot, there will be waterlogged round or oval dirty white spots in the initial stage, and the disease spot will expand rapidly and turn brown within one or two days, when the leaf surface loses luster and has slightly wrinkles, and the diseased tissue is slightly sunken. Water-soaked parts or wounds will soon rot, disease spots are mostly at the base of new buds, can be easily pulled up after decay, or break lodging, the disease part has a yellowish-brown mucus outflow, accompanied by bad smell. It seriously harms the growth and development of orchids.

Causes of soft rot of orchids

1. The garden soil cultivated with orchids is not sterilized, or the pond soil is eaten directly.

2. Use lake water infected by bacteria when watering

3. the application of excessive nitrogen fertilizer during the new bud growth period makes the leaves grow fat and tender, the leaf color is thick green, and it is very easy to induce bacterial invasion.

4. when the basin soil is too wet for a long time, the bacteria in the soil multiply in large numbers, producing toxic gases and substances, resulting in the decrease of plant resistance and finally leading to soft rot.

Control methods of soft rot of orchids

1. The garden soil and pond mud that cultivate orchids must be exposed to high temperature and sterilized by adding fungicides to ensure that the soil is free of pathogenic bacteria.

2. The application of liquid nitrogen fertilizer should be carried out before the new buds germinate to the time when the new buds grow without showing the leaves. Increasing the application of phosphorus and potassium fertilizer is beneficial to enhance the disease resistance of leaves.

3. Diseased leaves should be removed in time and burned or buried deeply to prevent re-infection, and be careful not to cause man-made mechanical damage so as to prevent bacteria from invading.

4. It is best to choose water close to the soil temperature for watering, and the water used should be clean. Do not pour water directly into new buds or heart leaves when watering.

5. In the early stage of the disease, it can be protected by spraying 160 times Bordeaux liquid, once every 5-6 days, and the effect is better. During the epidemic season, neophytomycin or agricultural streptomycin 4000 times solution is often used to control the disease, once every 5-7 days, two or three times.