Classification of turfgrass diseases According to the different pathogens, the diseases can be divided into two categories: non-invasive diseases and invasive diseases. Non-invasive diseases occur in both lawn and environment factors. Such as improper selection of grass species, soil lack of turfgrass growth necessary nutrition, imbalance of nutrient elements, soil too dry or too wet, environmental pollution. This type of disease is not contagious. Infectious diseases are caused by the infestation of fungi, bacteria, viruses, and nematodes. These diseases are highly contagious. The three necessary conditions are: susceptible plants, pathogens with strong pathogenicity, and appropriate environmental conditions. Prevention methods are as follows:
(1) Eliminating the primary infestation source of pathogens Soil, seed, seedlings, field diseased plants, diseased plant residues, and unfertilized fertilizers are the main sites for the majority of pathogens to pass through winter and summer. Soil disinfection (usually used) Formalin disinfection, formalin: water = 1 : 40, 10-15 liters per square meter for earth surface or formalin: water = 1: 50, and 20-25 liters for soil surface Square meters), seedlings treatment (including quarantine and disinfection of seeds and seedlings; commonly used disinfection methods on lawns are: formalin 1% - 2% dilution seed soaking seeds for 20-60 minutes, remove the wash cool after leaching Drying after sowing.) And timely elimination of diseased plant debris and other measures to control.
(2) Agricultural control: Suitable for grass, especially to select disease-resistant varieties, remove weeds in a timely manner, timely plough down fine fertilizers, timely treat diseased plants and disease sites, and strengthen water and fertilizer management.
(3) Chemical control: spraying pesticides for prevention and control. In general, in the early spring, all kinds of lawns will enter the vigorous growth period before the turfgrass occurs, and an appropriate amount of Bordeaux mixture will be sprayed once. After that, it will be sprayed once every two weeks and sprayed continuously for 3-4 times. This prevents the occurrence of various fungal or bacterial diseases. The types of diseases vary and the agents used vary. However, attention should be paid to the concentration of the drug used, the time and frequency of spraying, the amount of spray, and so on. General turfgrass leaves have good spray effect when they are kept dry. The number of spraying is mainly determined according to the length of the residual period of the medicament, generally 7-10 days once, and spraying a total of 2-5 times. After the rain should make up spray. In addition, as much as possible, various agents should be mixedly applied or used interchangeably so as not to produce drug resistance.
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