What's the matter with the yellow leaves of Luohansong? what if the leaves turn yellow?

Podocarpus is a kind of tree species that can keep evergreen all the year round, and it is also a good material for making bonsai. Because it grows sparsely in the wild and it is difficult to breed, it has once become a precious tree species and has been listed in the list of national protected tree species. At the same time, it is also because the leaves of Podocarpus keep green all the year round and are more used in landscaping, and as a bonsai, the green leaves are also very important ornamental parts.

However, in the daily maintenance and management process, it is inevitable to encounter the phenomenon of yellow leaves of Podocarpus. So, what's with the yellow leaves of Podocarpus? What if we come across yellow podocarpus leaves? First of all, if Podocarpus appears yellow leaf phenomenon, it will greatly reduce its greening effect, as a bonsai, then often let its ornamental value lost, this is also the most we do not want to see. To figure out what's going on, we have to keep looking.

According to the experience of planting other green plants, the yellow leaf phenomenon of plants is mainly due to the influence of factors such as unsuitable growth environment, improper water and fertilizer management, insect pests and so on. Podocarpus as a green plant, often may also be caused by these factors, but we need to combine its growth habits and characteristics to judge and timely disposal, as far as possible to reduce losses, so that plants can be successfully eliminated symptoms.

I. Temperature discomfort

Everyone knows that Podocarpus is not cold-resistant. When the temperature is too low, it is not only easy to enter dormancy, but may even be frostbitten. In fact, Podocarpus is also more afraid of high temperature, especially in the environment of high temperature and low air humidity, often more prone to yellowing of leaves. In addition, if the environment ventilation is not smooth, it may also cause diseases and insect pests!

Based on the above reasons, it is recommended to place Podocarpus in a relatively low temperature and ventilated environment in summer, and avoid long-term sun exposure. Of course, if the air humidity is relatively low, it is necessary to spray the air in time, or spray water to plants, ground, space, etc. to avoid high temperature and dry air environment. In this way, the phenomenon of yellow leaves caused by discomfort in the growth environment can be avoided.

Second, improper watering

Although Podocarpus has certain requirements for humidity in the growth environment, it is usually more humid, but it should not be carried out blindly in the process of hydration, especially when watering, but it should not be excessive. Because Podocarpus too dry or too wet or even stagnant growth environment may appear yellow leaves phenomenon.

In order to change this situation, usually when the pot soil becomes dry, it should be watered in time, and when the original air humidity is too low, it should be sprayed more, especially in the hot summer environment. However, the watering frequency of Podocarpus also needs to be controlled, and every time it needs to be watered, the drainage effect in the basin should also be good, so as to ensure that excessive water flow can be discharged to the outside of the basin in time. Once the yellow leaf phenomenon occurs in Podocarpus, it is first necessary to check the humidity of the basin soil, and even consider whether the relative humidity of the air is appropriate, and then take corresponding disposal measures.

III. Insufficient nutrients

Podocarpus in addition to wet, but also more fertile, if long-term nutrient deficiency, may lead to yellow leaves of the plant phenomenon. Especially in the growing season, although Podocarpus podocarpus grows slowly as a potted plant, it also needs a certain fertility of the soil, and the space in the flowerpot is limited after all, and the nutrient content is relatively limited, and it is also very important to keep Podocarpus podocarpus growing for a long time and apply fertilizer in time.

Generally, it is applied with sufficient base fertilizer when the upper pot is placed, and topdressing is done in the later stage. Once the yellow leaves of Podocarpus appear due to lack of nutrients, we generally need to improve by taking in appropriate nitrogen fertilizer, but often with the principle of "thin fertilizer and frequent application". You can also add an appropriate amount of ferrous sulfate, and then retting made of alum fertilizer application. Growth period can be maintained 1-2 months dressing once, generally combined with watering. Potted Podocarpus can also spray some low concentration of compound fertilizer water or cake fertilizer water as foliar fertilizer.

IV. Disease and insect infestation

In addition to the above three cases, if Podocarpus suffered from pests and diseases, due to tree damage, yellow leaves may also occur. Podocarpus is more susceptible to root rot, leaf spot disease and so on in high temperature, humid and airtight environment. Once it encounters these diseases, it is more prone to yellow leaf phenomenon. Of course, if you encounter a boring pest, it may also cause harm to the branches and even the trunk, and the same yellow leaf phenomenon will occur.

Therefore, in the daily conservation and management process of Podocarpus, in addition to creating a suitable growth environment for it, it is also necessary to do a good job in the prevention and control of pests and diseases. For the case of infection disease, we need to cut off these affected leaves in time and destroy them in a centralized way, and we also need to spray them once a week with drugs such as chlorothalonil and propiconazole, which can be cured by several consecutive alternate uses. At the same time, the yellow leaf phenomenon will gradually be eliminated.

Time: 2019-05-29 Click: