1. Turfgrass disease classification According to the different pathogens, the diseases can be divided into two categories: non-invasive diseases and invasive diseases. The occurrence of non-invasive diseases is due to both the lawn and the environment. Such as improper selection of grass species, lack of nutrients necessary for the growth of turfgrass in the soil, imbalance of nutrient element ratio, excessive dryness or excessive humidity of the soil, environmental pollution, etc. Such diseases are not contagious. Infectious diseases are caused by fungi, bacteria, viruses, nematodes, etc. This type of disease is highly contagious, and the three necessary conditions for its occurrence are: susceptible plants, pathogens with strong pathogenicity and suitable environmental conditions. The control methods are as follows: (1) The soil, seeds, seedlings, field diseased plants, diseased plant residues, and immature fertilizers that are the source of initial infection of pathogenic bacteria are eliminated. It is the main place for most pathogens to overwinter and oversummer, so use Soil disinfection (commonly used formalin disinfection, namely formalin: water = 1: 40, the amount of soil surface is 10-15 liters/m2 or formalin: water = 1: 50, the amount of soil surface is 20 —25L/m2), seedling treatment (including quarantine and disinfection of seeds and seedlings; the commonly used disinfection method on lawns is: soak the seeds in a 1%-2% formalin diluent for 20-60 minutes, after soaking Take it out, wash and let it dry, and then sow.) and timely eradicate diseased plant residues and other measures to control it. (2) Agricultural prevention and control: suitable grass for the site, especially the selection of disease-resistant varieties, timely removal of weeds, timely deep ploughing and fine fertilizer, timely treatment of diseased plants and disease occurrence areas, and strengthening of water and fertilizer management. (3) Chemical control: that is, spraying pesticides for control. In general areas, you can spray an appropriate amount of Bordeaux mixture once in the early spring before the lawn grasses are about to enter the vigorous growth period, and then spray once every two weeks for 3-4 times in a row. This can prevent a variety of fungal or bacterial diseases from occurring. The types of diseases are different, and the medicines used are also different. However, attention should be paid to the concentration of the agent, the time and frequency of spraying, and the amount of spraying. Generally, the spraying effect is good when the blades of lawn grass are kept dry. The number of sprays is mainly determined according to the length of the residual effect of the medicament, generally every 7-10 days, a total of 2-5 times. Respray after rain. In addition, various agents should be mixed or alternately used as much as possible to avoid drug resistance.
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