First, this kind of disease focuses on prevention, and medication has two main purposes, one is to prevent occurrence, and the other is to prevent spread after occurrence. In other words, once the drug is used again, it is difficult to recover the damaged grass seedlings.
Second, the work to be done now:
1, mixed with systemic and contact fungicides to prevent diffusion, once every 10 day, for more than two consecutive times. After digging and drying, sow or replant severely damaged areas (small areas can replant grass seedlings around the lawn).
2. Increase the application of phosphorus and potassium fertilizer to strengthen seedlings.
Three. Matters needing attention in the future:
1. The lawn is mainly fenced. Under the premise of maintaining normal green, apply nitrogen fertilizer as little as possible (4g urea per square meter in the growing season), and pay attention to the coordinated application of phosphorus and potassium fertilizer.
2. Pay attention to prevention during the annual growth period. Generally, the weather will be fine after the rain, and the internal disinfectant should be sprayed once a month according to the situation (pay more attention to the growth).
3, timely pruning, pay attention to ventilation.
4. High temperature and humidity and vigorous lawn growth are the high incidence periods of diseases, and prevention should be strengthened. Sometimes the disease will disappear by itself, so the external pathogenic conditions (temperature and humidity) are gone.
The above is for reference.