What to do if the leaves of Podocarpus macrophyllus turn yellow
This article provides a detailed explanation of what to do if the leaves of Podocarpus macrophyllus turn yellow and the related knowledge for solving the problem. Let's understand together.
Podocarpus macrophyllus is a common green plant that many people enjoy cultivating at home. However, during the cultivation process, it is inevitable to encounter some troublesome issues. For instance, what should you do if the leaves of Podocarpus macrophyllus turn yellow? How do you solve this problem? First, identify the cause and then address it. Here are some solutions for the yellowing leaves of Podocarpus macrophyllus compiled by the editor.
【Solutions for Yellowing Leaves of Podocarpus macrophyllus】
<1. Incorrect lighting causing yellowing of leaves>
<Solution>
Young Podocarpus macrophyllus are sun-loving trees, but under continuous high temperatures and intense sunlight, the leaves can be sunburned and turn yellow. Therefore, it is not advisable to expose them to strong sunlight for extended periods. It is recommended to keep them in the shade of trees. For mature Podocarpus macrophyllus trees, high temperatures and intense sunlight are beneficial for maintaining the tree's shape and leaves, so shading is not necessary.
<2. Incorrect watering causing yellowing of leaves>
<Solution>
If you water Podocarpus macrophyllus excessively, the potting soil becomes too moist, preventing air from entering and weakening root respiration. This affects the absorption of water and inorganic salts, leading to yellowing leaves. Water the plant when the soil is dry and aim for a moisture level of 30% wet and 70% dry.
<3. Incorrect fertilization causing yellowing of leaves>
<Solution>
If the leaves are mostly yellow and the yellowing is relatively uniform, it is likely due to excessive fertilization. Podocarpus macrophyllus should be fertilized primarily with nitrogen, applying thin and frequent fertilization. During the growing season, use decomposed organic liquid fertilizers every 10-15 days, and water the next day after fertilizing to aid root absorption.
<4. Iron deficiency causing yellowing of leaves>
Podocarpus macrophyllus leaves turn yellow, what to do?
<Solution>
In potted plants, the soluble iron in the potting soil is limited, so it is necessary to supplement iron fertilizer to avoid iron deficiency chlorosis, which causes yellowing leaves. You can spray 0.2% ferrous sulfate every 2-3 weeks or add 0.5% ferrous sulfate to the fertilizer. Ferrous sulfate contains iron, sulfur, and other trace elements, which can prevent Podocarpus macrophyllus leaves from yellowing and promote lush and shiny green leaves.
<5. Leaf spot disease causing yellowing of leaves>
<Solution>
If yellowing appears in localized areas of the leaves, it is likely due to leaf spot disease. The best course of action is to remove and burn the diseased leaves. You can also spray 75% carbendazim 500 times liquid or 25% propiconazole emulsion 1500 times liquid every week to control the disease, alternating between the two for 2-3 applications.
<6. Pests and diseases causing yellowing of leaves>
<Solution>
Podocarpus macrophyllus is prone to scale insect infestations in environments with poor ventilation, where chlorophyll is absorbed, leading to yellowing leaves. On one hand, it is necessary to improve ventilation. On the other hand, use 40% dimethoate 1000 times liquid or 2.5% deltamethrin 2500 times liquid during the nymph hatching period to control pests, and spray 5% carbendazim 500 times liquid during hot and rainy seasons for prevention.
<7. Long-term lack of potting change causing yellowing of leaves>
<Solution>
After a few years of growth, if Podocarpus macrophyllus is not repotted for a long time, the potting soil accumulates and changes, leading to yellowing leaves. Therefore, repotting and changing the soil is necessary. The soil can be a mixture of decomposed leaf soil, mountain soil, and pond soil, with added decomposed fertilizer.
<Conclusion>
When yellowing leaves of Podocarpus macrophyllus are observed, it is important to identify the cause promptly and address it. Only by doing so can the root cause be thoroughly resolved, restoring the plant's vitality and ensuring its healthy growth. It also allows for a flexible response to problems encountered.
The detailed explanation shared above on what to do if the leaves of Podocarpus macrophyllus turn yellow and how to solve the problem hopes to provide you with assistance in green plant management.