When raised like this, you don't have to worry about getting yellow leaf disease anymore.

Even if the magnolia does not blossom, it is also a very pleasing bonsai, but the flowers do not bloom very often. Now there is something wrong with the leaves that you often see. Will there be yellow or yellowish brown dots on the leaves of your magnolia? and this spot will get bigger and bigger and deepen gradually, or the whole leaf will change color, resulting in the whole plant being infected and eventually hopeless.

In this situation, there is no doubt that your gentleman orchid has leaf spot disease. If you get sick, you should find the cause of the disease and prescribe the right medicine. There are several symptoms and causes of leaf spot disease.

Symptoms: 1. Leaves irregularly spotted, 2. It begins to appear from the tip of the leaf and continues to extend, 3. The leaves turned yellow, the yellow leaves were irregular, 4. The whole leaf turns yellow from bottom to top, 5. The stem first yellowed and gradually extended to the leaf surface.

Reason: 1. Fermented fertilizer is not used when fertilizing, which makes these bacteria multiply recklessly in the basin. two。 Flower growers do not change pots for a long time, the soil no longer has the nutrients that plants need, and there are a large number of germs and bacteria in the old soil. 3. The new soil was not fermented, so it was relatively raw and then carried out the second fermentation in the basin. 4. Poor ventilation in summer, fertilization when all the fertilizer imbalance, nitrogen, phosphorus, potassium should be applied according to the amount needed by the plant, fertilizer touched the root of the plant. 5. The strong light exposure on the leaf surface caused a burn on the leaf surface. Insect pests destroy plant roots and stems

Treatment and prevention: when yellow leaves appear, remove the diseased leaves in time, don't be reluctant to give up, because if you don't clean up the leaves in time, after cleaning up, you can wake up and spray the plants with carbendazim. When watering, do not water the false bulbs of adult flowers, raise flowers in summer, pay attention to ventilation, pay attention to heat preservation management when the temperature is low, and give plants some medicine regularly. Germicidal agents such as carbendazim, methyl topu, chlorothalonil and agricultural streptomycin can not only prevent diseases and insect pests, but also reduce the production of leaf spots.

Therefore, we should take corresponding measures according to different reasons, first of all, cultivate the roots of the plant, do not let the plant rot, so that the leaves can have sufficient nutrition. Then raise the leaves of the plants to prevent the injury of the leaves. Fermented fertilizer must be used when fertilizing, the concentration of fertilizer should not be too high, and nitrogen, phosphorus, potassium and other fertilizers should be used in balance. The time to change the soil is in the spring and autumn of the year. When using the soil, do not choose raw soil. Take good care of each plant so that it can grow better.