What to do if the leaves of Podocarpus turn yellow

The reason why the leaves of Podocarpus turn yellow

There are many reasons for the yellowing of Podocarpus leaves. It may be caused by pests and diseases, such as foot rot and leaf spot. It may also be that the temperature is too high and the air humidity is insufficient, or too much fertilizer is applied or undecomposed organic fertilizer is applied, which leads to root rot and affects the absorption of nutrients by the leaves, or it may be caused by excessive watering and poor drainage.

Yellowing of Podocarpus leaves and its prevention and control methods

If you see that the leaves of the entire tree crown are basically yellow and the yellowing is relatively uniform, it is very likely that too much fertilizer has been applied, causing a considerable part of the absorbing roots to be burned. The roots cannot absorb enough water and nutrients to support the consumption of the upper organs, causing the leaves to turn yellow. If you are planting Podocarpus in a pot, you can replace the soil in the pot several times, and then spray the crown with water mist frequently, and provide shade to increase the air humidity and reduce evaporation from the crown.

If the yellowing of leaves in the crown is localized, it is likely that the leaves are infected with leaf spot disease. Remove and burn the diseased leaves in a concentrated manner. You can spray 75% Benomyl 500 times diluted, 25% Propiconazole 1500 times diluted and other fungicides once a week or so for prevention and control, and spray alternately 2-3 times.

If red irregular spots appear at the tips of young leaves on the branches, and the spots spread from the tip to the base of the leaves, the tip half of the leaves will die. In the later stage, the color of the lesions turns light brown, and small black spots appear on both sides of the diseased part of the leaves. This is leaf blight, which is generally more likely to occur in April, May, August and September. The causes of leaf blight may be extensive management, poor ventilation conditions, and wounds caused by sunburn. The prevention and control method is to cut off dead branches in winter, remove diseased leaves and destroy them in a centralized manner, strengthen management, and enhance the disease resistance of the plants.