Prevention and treatment of rotten heart disease in orchids

Prevention and treatment of rotten heart disease:

Characteristic morphology of ① disease: rotten heart disease is generally found in the new buds of orchid plants. The leaves are most susceptible to infection when they are 7 cm long and 10 cm long. At the beginning, a wet rot spot occurred near the pseudobulb in the leaf tip of the new bud (often in the bract of the leaf tip, so it was difficult to find). About a day later, the blue spot gradually deteriorated to dark brown and spread to all parts of the orchid plant. In a short period of one or two days, the whole plant of the new bud starts from the inside of the leaf tip to the outside, until the leaf tip turns brown and rotten. If it is found later, the pathogen invades the mother plant from the junction between the new bud pseudobulb and the mother plant pseudobulb, destroys all parts of the tissue, and finally spreads to the whole plant, resulting in death.

The source of ② bacteria: the pathogen of this pathogen is bacteria, which usually occurs in the growing period of new buds or the period of plum rain in spring and autumn, so the climate is changeable, high temperature and humidity, and new buds are easy to be infected. When the new buds grow at the beginning, the leaves overlap, such as when the humidity in the atmosphere is high, the moisture in the leaf tip can not evaporate, and the water accumulates, when the temperature rises, the pathogen parasites here, wantonly activities, spread and destroy the leaf tissue.

According to the statistical results of the survey, the disease is often caused by environmental changes. For example, when the orchid is divided or transferred by another orchid, or when the orchid is transformed and built, bacteria invade when the orchid strain is weak. Watering method is also related, in the occurrence of new bud sprouting for a long time, the use of leaching method, there are more infected patients.

③ prevention and treatment: the bacteria of the disease are parasitic in the leaf tip, so the culture should pay attention to the growth state of the orchid plant from time to time during the new bud growth period. When it is found that the leaf surface of the new plant is in bad condition, it should be examined in detail. when the leaf surface is wrinkled (like a state of insufficient water), avoid watering from the leaf surface and use basin irrigation. When it is confirmed that the disease is infected, the new buds should be removed immediately, and the uninfected mother strain should be disinfected and then planted in isolation. If the whole plant is infected, the whole plant should be burned in a pot to avoid the spread of germs. The purchased orchid plants must be disinfected by large cornflour and planted. The garden is regularly disinfected once or twice a month for prevention. Avoid washing watering for a long time, and use basin irrigation. If it is found that the foliar moisture cannot be dried in a short time after watering during the Meiyu period, ventilation should be strengthened.