What to Do When Grapevine Leaves Turn Yellow
The editor will tell you about the knowledge of flowers and plants on how to deal with yellowing leaves of grapevines. The following is an introduction for you.
What to Do When Grapevine Leaves Turn Yellow
The yellowing of grapevine leaves is caused by insufficient watering, excessive sunlight, fertilizer damage, and (T-J) disease. Watering should be moderate, keeping the soil slightly moist, and fertilizing frequently with light doses. It is not necessary to fertilize too often. When applying fertilizer, it's appropriate to loosen the soil. If leaf spot disease occurs, spray the entire tree with a 50% carbendazim wettable powder, which needs to be diluted with water before use.
Why Do Grapevine Leaves Turn Yellow
The yellowing of grapevine leaves is a process. Yellow spots will appear on the leaves, and over time, these spots will gradually necrotize. The edges of the leaves will turn yellow and dry, but the veins will remain normal, eventually leading to the yellowing of the entire plant.
Common Reasons for Yellowing of Grapevine Leaves
1. Caused by drought: Grapevines need water to grow, and if watering is not timely, leading to excessively dry soil, it can cause the leaves to turn yellow and dry.
2. Due to sunburn: After the plum rain season, there will be more sunny days, and the environment will be very hot, making the edges of grapevine leaves prone to sunburn and yellowing.
3. Caused by fertilizer damage: If grapevines are not fertilized with nitrogen fertilizer in time during growth or if they are applied with insufficiently decomposed fertilizer, it can affect root growth and cause yellow leaves.
4. (T-J) disease: If grapevines are watered too much during maintenance, poor drainage, a stuffy environment, and high temperatures can easily cause (T-J) disease, leading to yellow leaves.
Methods to Treat Yellowing of Grapevine Leaves
1. Water grapevines moderately and adjust according to weather changes. In hot and dry summers, water frequently, but during the rainy season, do not water and control the water flow to prevent excessive accumulation of water in the soil.
2. Control the amount of fertilizer for grapevines, fertilize frequently with light doses, and do not fertilize too often. When applying fertilizer, it's appropriate to loosen the soil to keep the leaves green and lush.
3. If excessive medication causes yellow leaves, water more and dilute the sprayed medicine as much as possible, then expose the plant to more sunlight. Photosynthesis can help alleviate the yellowing of the leaves.
4. If leaf spot disease occurs, spray the entire tree with a 50% carbendazim wettable powder diluted with 500 times water. For scale insects and red spider mites, use a toothbrush to gently brush them off with soapy water, then spray the whole plant with insecticides such as thiazine.
How to Prevent Yellowing of Grapevine Leaves
Grapevines need timely watering to maintain soil moisture. Water thoroughly each time and apply pesticides when pests or diseases appear, but be careful with timing. It is best not to apply pesticides at noon in the summer or when dew is still present.
The comprehensive explanation of what to do when grapevine leaves turn yellow provided above is hoped to help you.