What causes yellowing leaves on golden passion fruit, and how should it be prevented and controlled?

In recent years, passion fruit has become a popular planting project, and many people have followed the trend to grow it, but many problems have also appeared. Among them, golden passion fruit has shown leaf yellowing in many areas. Some say it is caused by nutrient deficiency, while others say it is caused by disease. So what exactly is going on? Let's find out together.

1. Anthracnose

Anthracnose is one of the main causes of yellow leaves on golden passion fruit in early spring. In summer, in high-temperature, rainy, and humid places, the disease is extremely severe. It very easily harms passion fruit fruits and also damages branches and leaves. In the early stage of the disease, small light brown round spots appear on the leaves and expand within a short time, becoming brown or dark brown. After the fruit is affected by anthracnose, its appearance quality decreases, greatly reducing its commercial value, and sometimes it cannot even be eaten, causing huge losses.

Prevention and control measures: Do a good job of pruning the orchard to avoid closure and humidity in the orchard, which is favorable for the spring spread of the pathogen. Before the rainy season, pyraclostrobin can be sprayed for prevention, once every 7-10 days, for 2 consecutive sprays. In the early stage of the disease, diseased leaves can be removed, and prochloraz 800-fold solution + 25% pyraclostrobin can be used for control.

2. Viral disease

Golden passion fruit is less sensitive to viral disease than purple-red fruit, but this does not mean it will not get viral disease. Passion fruit viral disease can occur as mixed infections of multiple viruses. When leaves are affected, yellowing, mottling, and wrinkling appear, seriously affecting photosynthesis in passion fruit and hindering the transformation and absorption of nutrients.

Prevention and control methods: Start from the source when preventing and controlling it. Virus-free and healthy seedlings should be selected. At the same time, aphids should be controlled to avoid vector transmission. When pruning different plants, the scissors should be disinfected. Avoid interplanting with melons and fruits, solanaceous crops, and herbaceous crops to reduce sources of viral infection.

3. Root damage

During the rainy season, rainfall is heavy, and passion fruit is a shallow-rooted crop. After being soaked by rainwater, it is very prone to root rot and damage, affecting the absorption of medium and trace elements. Leaves are very prone to wilting and yellowing, and orchards with poor drainage are extremely prone to outbreaks of stem rot, causing plant death.

Prevention and control methods: Do a good job of drainage to keep the soil in the greatest possible state of aeration and prevent root diseases in passion fruit. At the same time, after rain, also check the root condition of passion fruit and do timely root care. Hymexazol or metalaxyl can be used as a root drench for control. After rain, the ability of fruit trees to absorb nutrients from the soil decreases, so do not rush to apply fertilizer after recovery.

The above is an introduction to the causes of yellowing leaves on golden passion fruit and prevention and control measures. We hope it can help you. To learn more related knowledge, please keep following us.