Methods of removing diseased spots in leaves of Cymbidium

During the growth of Cymbidium, if the cultivation environment is uncomfortable, poor ventilation, insufficient light, improper air humidity, or the spread of bacteria in the surrounding environment, it is easy to be infected with diseases such as leaf spot, anthracnose or leaf blight, in addition to drug control, it is very important to remove the disease spot in time and prevent its further spread in the plant. This is also an important part of maintaining the overall shape of Cymbidium.

The operation of removing the disease spot on the leaf is not complicated, but it needs to be carried out carefully and carefully according to the operation rules.

Cymbidium cultivated in the open air in summer should avoid overcast and rainy weather and morning dew when it is not dry. It's best to have sunny mornings until four o'clock in the afternoon. Greenhouse cultivation, to avoid watering, spray humidification before and after operation, so as not to spread germs with water.

Both double-sided blades and single-sided blades can be used as tools, the one-sided blade is better, the one-sided paper-cutting blade with a length of about 10 cm is the best, and the lower part of the hand should be wrapped with adhesive tape to avoid hand injury. The blade blade should be sharp and should be replaced every 5-7 days. Blunt blades may split the blade or form a jagged wound and should be replaced at any time if necessary.

When cutting diseased leaves, the blade should be stained with fungicides, which can be prepared with 1000 times of Dasheng, carbendazim or targeted agents according to the types of diseases. Most fungicides are wettable powders, which will precipitate if they are left standing for too long, so shake the container frequently. The pharmacy is placed in a cup-shaped container with small mouth, large bottom and good stability.

Slowly pluck up from the base of the plant with both hands, and check the distribution of the diseased leaves of the whole plant on both sides. Some disease spots are not obvious on the upper surface of the leaves and obvious on the lower surface, so we should pay attention not to omit them. The knife should be placed 1.5-2.0 cm away from the disease department, but there is no need to deal with the patients that have a tendency to heal. When operating, hold the main vein of the blade by hand, hold it tightly, and the blade blade will not strike Wei when you hold it tight. Quickly remove the knife from the edge of the upper surface of the leaf, so that the area of the knife edge is minimum, and the area of the slope-shaped knife edge is large. To avoid cross cutting from the lower surface or back of the leaf, it will cause the phenomenon of "peeling" to leave a thin epidermis; if the edge of the leaf is pinched by hand, it is not easy to cut off.

When cutting diseased leaves, the scattered diseased leaves, withered leaves and old leaves that have no photosynthesis should be removed at any time.

After cutting 3-4 leaves and one plant, replace the blade, put Z blade in the container and use it in turn to ensure that each blade is fully sterilized. The incomplete disinfection of the blade will cause cross-infection between plants, and the bacteria will spread faster.

The diseased leaves should be treated centrally on the same day when they are cut off. They can be buried centrally and should not be left anywhere. Otherwise, rain and wind will accelerate the spread of pathogens. (side)