Common sense of disease prevention of orchids

Budding disease

From April to September during the bud growth period, if the roots of the new leaves suddenly turn brown and rot when the leaf sheath is healthy, this is due to soft rot. The way to prevent it is: don't let the water stay on the buds. The buds stop growing during their infancy and appear black spots, which is caused by anthrax. The method of prevention is to spray organic sulfur fungicide 1Mel twice a month.

Diseases of leaves, roots and petals

Anthrax: after the temperature rises, irregular brown spots appear in the leaves, and the area gradually expands, or the appearance of swirling patterns indicates anthrax. The method of prevention is to spray organic sulfur fungicide 1Mel twice a month.

Leaf blight: the tip of the leaf suddenly turns brown and dries up. Or the base of the leaf or leaf sheath discoloration, and there are black spots around, indicating that suffering from leaf blight, when there is a root disorder, it is easy to suffer from this disease. Spray organic sulfur fungicide (Dasheng) 1 Mel twice a month.

Atrophy: when there are some white spots on the leaves, or yellow lines, gangrenous spots, indicating atrophy. The disease cannot be prevented by medicine. Once you get the disease, you need to be quarantined immediately. As the disease is easy to spread through water, the practice of soaking the basin in a bucket or under the scaffolding should be suspended immediately to prevent the disease from spreading to other plants.

3. Soft rot: at high temperature, the leaf base suddenly turns yellowish brown, and the bulbs also rot, indicating that they are suffering from soft rot. The prevention and cure method is to keep the ventilation and drainage in good condition, and do not let the water stay on the new bud.

4. White silk disease: at high temperature, white filaments appear near the leaf root or on the bulb, and produce many brown granules. This is a disease called white silk disease, which can wither the whole plant in the twinkling of an eye and make white hyphae appear around the root. As there is no medicine to treat it, once the diseased plant appears, it should be destroyed and discarded immediately, or it should be planted and isolated with new plant materials. The preventive method is to keep the basin clean as far as possible, and do not let the basin come into direct contact with the ground and maintain a ventilated state.

5. Grey micro-disease: when flowering, the petals appear watery and discolored, and micro-bacteria grow, which indicates that they have suffered from gray micro-disease. The way to prevent it is to keep the petals out of the water, spray them with 2,000 times the diluent of melyde when the buds are still very young, and don't let the room get hot.

The above diseases are all caused by fungal infection, which can be controlled by fungicides such as topiramate, chlorothalonil, Dysenjiang and so on.