Lawns play an increasingly important role in the construction of modern social environment. After planting, lawns always fail to achieve the expected aesthetic effect due to various reasons. One of the phenomena is that small yellow spots appear on the leaves, and then dry up and die. One of the reasons for this phenomenon is that the lawn is infected with bacteria and suffers from bacterial wilt, which can occur and parasitize on many grasses. Once the disease expands, it will destroy the entire green in a short time.
The specific analysis of bacterial wilt is as follows
1. Distribution and harm of bacterial wilt
Bacterial wilt can parasitize and occur on many grasses; once infected with this disease, yellow spots will appear on the leaves, gradually develop into long stripes, and then the leaves will turn yellow-brown to dark brown. When scattered dark green water-soaked spots appear, the spots will quickly dry up and die.
2.Symptoms after infection with bacterial wilt
After infection, 1 mm water-soaked spots will appear on the leaves, which are difficult to detect with the naked eye. The spots will gradually expand and turn gray-green to yellow-brown or white until death. The spots will expand and border each other until the entire leaf is killed. When the surrounding environment is humid, bacterial pus will be produced at the spots, which can invade the wounds of the plants to lurk or cause disease. Bacterial wilt disease on creeping bentgrass first appears as coin-sized red or copper-colored dead grass patches, followed by the death of a large number of surrounding plants, destroying the entire green in a short period of time.
3. Season of bacterial wilt
Bacterial wilt is prone to occur in the spring and autumn seasons when the environment changes greatly from morning to evening in a humid and cool environment. The seasonal characteristics are the root cause of the disease. When the disease first occurs, the leaves appear blue-green and wither, and the leaves shrink and gradually turn reddish brown or purple, eventually leading to leaf death. Coin-sized patches will appear on the dead lawn, and soon a large area of the lawn will wither and die.
4. Conditions for the occurrence of bacterial wilt
The pathogen of bacterial wilt spends the discomfort period on the plant, and then attacks the plant at any time. The attack methods are varied and difficult to control. When the plant has external injuries, it can be infected. The wounds caused by pruning can also be infected. Not only that, this pathogen can penetrate into every hole. When the plant absorbs water, this pathogen can also penetrate into the plant body through the permeable holes, especially during irrigation and heavy rain, which accelerates the spread and occurrence of this disease. In the low-lying areas on the lawn, the disease is more serious and difficult to control.
5. Prevention and control of bacterial wilt
Like all prevention and control principles, prevention is the priority, and there are two key points for prevention:
1. When building lawns, varieties with good disease-resistant genes should be selected.
Note: Creeping bentgrass Toronto (C-IS), Nimisilla, Cohancey varieties and Bermudagrass Tifgreen varieties are susceptible to the disease.
2. Efforts in the growth environment: careful management, professional guidance, attention to drainage, moderate mowing, and avoid frequent sand covering.
When the disease occurs, effective and powerful drug treatment should be adopted
Antibiotics: Oxytetracycline, streptomycin, etc. have certain effects on bacterial wilt. When applying the medicine, high concentration and increased dosage are required, which can control the disease for 4-6 weeks.
Post time: Dec-17-2024