Latest Causes of Yellowing Leaves in Golden Passion Fruit and Control Measures
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 shows leaf yellowing in many regions. Some say it is caused by nutrient deficiency, while others say it is caused by disease. So what exactly is going on? Come and learn about it with the editor.
1. Anthracnose
Anthracnose is one of the main causes of yellow leaves in golden passion fruit in early spring. In summer, in hot, rainy, and humid places, the disease is extremely severe, very easily harming passion fruit fruits, and also harming 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 infected with anthracnose, its appearance and quality are reduced, greatly lowering its commercial value, and sometimes it cannot even be eaten, causing huge losses.
Control measures: Do a good job of pruning the orchard to avoid closed, humid orchard conditions, which are favorable for the spring spread of the pathogen. Before the rainy season, spray pyraclostrobin for prevention, once every 7-10 days, for 2 consecutive sprays. In the early stage of the disease, remove diseased leaves, and use prochloraz 800-fold solution + 25% pyraclostrobin 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, symptoms such as yellowing, mottling, and shrinkage appear, seriously affecting photosynthesis in passion fruit and hindering the transformation and absorption of nutrients.
Control methods: Start control from the source. Choose virus-free, healthy seedlings. At the same time, control aphids to avoid vector transmission. When pruning different plants, the scissors must be disinfected. Avoid interplanting with melons, fruits, Solanaceae 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 very prone to outbreaks of stem rot, causing plant death.
Control methods: Do a good job of drainage, keep it in the maximum possible ventilated state, and prevent root diseases in passion fruit. At the same time, after rain, also check the root condition of passion fruit and carry out timely root care. Hymexazol or metalaxyl can be used as a root drench for control. After rain, fruit trees have reduced ability to absorb nutrients from the soil, so do not rush to fertilize after they recover.
The above is an introduction to the causes of yellowing leaves in golden passion fruit and control measures. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.