First, the death caused by large-scale pruning
In order to reduce the cost of maintenance, the lawn grass is not pruned for a long time, and it is greatly pruned at the opportunity of pruning. Due to the high temperature in July and August, excessive pruning at one time, and the lack of water supply, the lawn is easy to die. Generally this happens after pruning and occurs in large areas, especially in higher places where the death is more severe. Solutions to the death caused by pruning:
If the lawn is too tall, it is recommended not to prune too low at a time, it can be trimmed multiple times, and watering in time after pruning is required. Summer lawn can be appropriately increased by about 1-2cm pruning height. The recommended pruning height (stubble height) for cold season lawns is 4-6 cm, and the recommended mow height for warm season lawns is 3-5 cm.
Trimming tips:
1. Pruning time: It is recommended to prune after the dew dries in the morning to reduce the chance of increased bacterial invasion due to the simultaneous presence of wounds and dew.
2. When pruning each time, ensure that the blade of the lawn mower is sharp, so as to avoid the lawn leaves being torn and strained, affecting the aesthetics of the lawn and breeding bacteria. After pruning, spray fungicides such as Green Shield and Guangxine in time to avoid feeling sick by pruning the wound.
Second, the lawn is caused by diseases
Yellowing and death caused by diseases of lawn grass generally has a process of onset, and mycelium will be found early in the morning at the location of the disease. So how to quickly determine whether it is caused by the onset of the disease? More than 80% of lawn diseases are caused by fungi. And before the disease is formed, some colonies and colors that can be observed by the naked eye are formed. Therefore, it is easy to observe mycelium and so on at 5 o'clock in the morning. First observe the diseased leaves; because the leaf tips are the growth points of the grass plants, they are the youngest parts of the grass plants and are most susceptible to the invasion of pathogens; the leaves are often pruned, and the pruned wounds are susceptible to germs; the common lawn diseases in July and August are brown spot disease, summer spots, putrid mold blight, and sickle blight. Learn about the diseases that form large circular spots
The dead spots on the lawn are more than 30 cm, and the large spots can reach 3-4 m, and the spots appear to be slightly round. The main diseases are: brown spot disease, total erosion disease, sickle blight and so on.
Learn about the diseases that form small round spots
The lesions are 2-20 cm in diameter and are rounded. Diseases cannot be controlled in time, and small spots will spread and combine with each other into irregular large spots. The main diseases are: red silk disease, rot mold blight disease, coin spot disease. Solution to yellowing caused by disease:
Apply less nitrogen fertilizer during the maintenance process and try not to apply urea in the summer. If there is a need for fertilization, it is recommended to spray foliar fertilizers such as green run, and once the disease is found, spray lawn spray fungus, putrefactory, grass disease elimination and other lawn-specific fungicides in time, it is recommended to re-spray once every 5-7 days.
Third, the yellowing caused by pests such as the twill moth grub
Pests such as nocturnal moths, grass borers, and ground tigers will eat up the leaf veins and young stems, and bite them day and night on rainy days and nights. If the lawn is not prevented in time, it will cause the entire lawn to die when it is serious, which will seriously affect the ornamentation and normal growth of the lawn. The elderly larvae are more active in the lawn rhizosphere, and the insect feces are more obvious, and mostly feed in the morning, evening and night. It is infested from May to October. The larvae feed day and night, mainly at night. During the day, it inhabits the leaf back, rhizome, or near moist soil of lawn grass. The elderly larvae are more active in the lawn rhizosphere, and the insect feces are more obvious, and mostly feed in the morning, evening and night. Solution to the yellowing caused by the pale sword nocturnal moth:
1, combined with mowing the lawn, spray leafworm net + wild killing, each bottle of 200 ml with water 160 kg of water, spray wet turf grass, it is recommended to spray once in 5-7 days.
2, sprinkle the ground damage flat granules, 2-3 kg per acre of medicine, pay attention to remember to water in time after application.
3. Remember that the effect of medication in the evening is better.
Grubs mainly harm the grass roots of the lawn, and the lawn is easily lifted after harming. Solution to yellowing caused by grubs:
2-3 days after lawn mowing, 2kg-4kg/mu of land damage flat or Ping'an compound medicinal fertilizer is evenly spread after 4 p.m., and then watered. This agent contains an inert carrier, will not be released at one time, needs 3-4 times, and has an effective period of 1-2 months. Rubber gloves are required when applying.
