Because the surface of the leaves is burned by the sun, the cold wind blows, some parts are bitten by slugs, snails and other diseases and insect pests, or the wound expands after the injury. If the leaf tip turns yellow first, the main reason is that rotten root causes the interruption of leaf nutrition supply. It can be caused by the use of raw soil or poor soil quality.
First of all, we should prevent the plant from rotting, so that the leaves can get sufficient nutrition, and then we should put an end to the injury and prevent the spread of the wound. The amount of fertilizer applied must be well controlled and avoid hypertrophy. In summer, the adult flowers should not be watered at the pseudobulbs. In summer, we should pay attention to ventilation, strengthen the management of cooling and regularly spray the fungicides such as carbendazim, chlorothalonil, methylparaben and agricultural streptomycin for prevention and control. That is to say, it can reduce the occurrence of leaf spot and yellow leaf disease.
