Is it a disease that there are yellow spots in the leaves of Cymbidium? it is necessary to distinguish between different situations.

The leaves of the orchid are as dark green as satin, so even if they do not blossom, the orchid has ornamental value. This may be one of the reasons why magnolia is popular. However, if the leaves of Cymbidium have yellow spots, it will directly affect its ornamental effect. So, is it a disease that there are yellow spots in the leaves of Cymbidium?

It is said that when the leaves of Cymbidium turn yellow, it is necessary to distinguish different parts and conditions to confirm whether they have the disease.

1. If the bottom leaves grow new roots from the axils of the leaves, it is a normal metabolism to make the leaves yellow.

2. If there is no new root in the axilla and the leaf turns yellow, it is mostly due to the soil quality, poor air permeability, too much fertilizer or poor watering dry humidity, which may make the leaves of Cymbidium yellow. If the water is impermeable and the root tip is short of water, it will make the leaf tip yellow and dry. If this happens, it must be watered thoroughly. In summer, a small basin of water can sit at the bottom of the flowerpot every 7 times and 10 days, so that it can be watered thoroughly. This is called flooding.

3. If yellow spots of different sizes appear on both sides of the leaves, it is possible to get leaf spot disease.

The main symptom of leaf spot disease is that yellow or brown dots appear on the leaf surface, and then the color of the spot deepens gradually, and the festering area of the spot gradually expands, so that the leaf or the whole plant rots away.

The main causes of leaf spot disease are: first, the application of fertilizer that is not fermented well. Cause germs to multiply in the basin soil. Second, the basin soil has not been changed for a long time, and there are pathogenic bacteria in the old soil. Third, the new soil has not been fully fermented. Second fermentation in a basin. Fourth, fertilizer nitrogen, phosphorus, potassium imbalance, especially less potassium fertilizer or fertilization caused by fertilizer direct contact with the root. Different methods should be taken to prevent and cure the disease according to the specific reasons. The fertilizer must be fully fermented, the concentration of fertilizer should be small, nitrogen, phosphorus and potassium should be balanced, and the fully fermented nutrient soil should be changed twice a year in spring and autumn without raw soil. In this way, leaf spots can be prevented.

4. If the leaves turn yellow irregularly, you may get leaf yellow disease.

First, the leaves turn yellow, and the parts of the yellow leaves are irregular. This is due to the fact that the leaf surface is burned by sunlight, cold wind, local spread of bacteria in the area bitten by pests such as slugs and snails, or enlarged wounds after trauma.

Second, the leaf tip first yellowed and gradually spread to the false bulb. It was mainly the rotten root that interrupted the nutrient supply of the leaves, and began to turn yellow from the leaf tip to the false bulb. Or fat and thick use of raw soil or poor soil quality can cause this phenomenon.

The reason may be that insect pests bite the leaves of the pseudobulb and make it gradually expand to the tip or stagnant water at the pseudobulb in summer and bacteria breed local yellow leaves here.

This kind of situation is more common, and the causes are also more complex, mainly due to improper management. Such as poor ventilation in summer, excessive fertilization, root problems and so on may make the leaves turn yellow as a whole.

The appearance of yellow spots in the leaves of Cymbidium may be the beginning of leaf spot or leaf yellow disease. As a breeder, we should pay great attention to this, find out the cause of yellow as soon as possible, and prescribe the right medicine to the case.