First, the lawn disease. Diseases of lawns are classified as non-invasive diseases and invasive diseases. The cause of non-invasive diseases is the lawn and the environment. Such as improper selection of grass species, soil lack of grass growth necessary nutrition, imbalance of nutrient elements, soil too dry or too wet, environmental pollution. Infectious diseases are caused by the infestation of fungi, bacteria, viruses, and the like. Prevention methods are as follows:
1, eliminate the initial infection of pathogenic sources: soil, seed, seedlings, field diseased plants, diseased plant residues and unrefined fertilizer, is the main place for most of the pathogens overwintering and over-summer, so the use of soil disinfection, species Treatments such as seedlings treatment and timely elimination of diseased plant residues were controlled.
2. Agricultural control: appropriate land and grass, especially the selection of disease-resistant varieties, timely removal of weeds, timely deep plowing, timely treatment of diseased plants and diseases, strengthen water and fertilizer management.
3. Chemical control: Spray pesticides to prevent and cure. In general, in the early spring, all kinds of turf will enter the vigorous growth period before the turfgrass occurs. Before the onset of turfgrass, proper amount of Bordeaux fluid is sprayed one time. After that, it is sprayed once every two weeks and continuously sprayed 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, the time and frequency of spraying, the dose of the drug, 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 once every 7-10 days, and can be sprayed for 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.
Second, the damage of the lawn. Apes are widely distributed in nature, and aphids have become more and more harmful to lawns. Mink body is small, round or oval, often red, sucking mouthparts. In the middle and late October, the adult females clustered in the dead leaves, the weeds, the clods or the bark. In February and March, they feed on the grass to breed eggs and rely on the wind, rain, water, and the spread of the host to spread the disease. Young cubs and adult crickets are all active on the back of the leaves, and the leaves are netted. In July and August, the damage was most prosperous. In case of high temperature and low humidity, the reproductive rate increases. The erythema appeared below the victim's leaf and quickly scorches and falls off. In severe cases, it can cause alopecia areata and even large areas of death.
Prevention measures include: cleaning the lawn in winter and eradicating the overwintering host; spraying 30 to 40 times of oil emulsion in early spring to kill wintering eggs; spraying 800 to 1000 times 20% of dicofol to kill nymphs during the nymph incubation period; spraying 20% ​​of dicofol in summer 2000-3000 times liquid.
1, eliminate the initial infection of pathogenic sources: soil, seed, seedlings, field diseased plants, diseased plant residues and unrefined fertilizer, is the main place for most of the pathogens overwintering and over-summer, so the use of soil disinfection, species Treatments such as seedlings treatment and timely elimination of diseased plant residues were controlled.
2. Agricultural control: appropriate land and grass, especially the selection of disease-resistant varieties, timely removal of weeds, timely deep plowing, timely treatment of diseased plants and diseases, strengthen water and fertilizer management.
3. Chemical control: Spray pesticides to prevent and cure. In general, in the early spring, all kinds of turf will enter the vigorous growth period before the turfgrass occurs. Before the onset of turfgrass, proper amount of Bordeaux fluid is sprayed one time. After that, it is sprayed once every two weeks and continuously sprayed 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, the time and frequency of spraying, the dose of the drug, 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 once every 7-10 days, and can be sprayed for 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.
Second, the damage of the lawn. Apes are widely distributed in nature, and aphids have become more and more harmful to lawns. Mink body is small, round or oval, often red, sucking mouthparts. In the middle and late October, the adult females clustered in the dead leaves, the weeds, the clods or the bark. In February and March, they feed on the grass to breed eggs and rely on the wind, rain, water, and the spread of the host to spread the disease. Young cubs and adult crickets are all active on the back of the leaves, and the leaves are netted. In July and August, the damage was most prosperous. In case of high temperature and low humidity, the reproductive rate increases. The erythema appeared below the victim's leaf and quickly scorches and falls off. In severe cases, it can cause alopecia areata and even large areas of death.
Prevention measures include: cleaning the lawn in winter and eradicating the overwintering host; spraying 30 to 40 times of oil emulsion in early spring to kill wintering eggs; spraying 800 to 1000 times 20% of dicofol to kill nymphs during the nymph incubation period; spraying 20% ​​of dicofol in summer 2000-3000 times liquid.
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