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Pasture common disease control methods
Downy mildew 1 plant disease resistant pasture varieties. There is a great difference in the ability of forage grass to resist downy mildew, and high-resistance varieties can be selected according to local conditions to reduce the occurrence of diseases. 2 Mowing the pasture as soon as possible to reduce the source of bacteria. Pay particular attention to eradicate the diseased plants in early spring. 3 Reasonably irrigate to prevent the grass from getting too wet. (4) When grassy diseased plants appear, Bordeaux's solution, zeinzinc, and thiram can be sprayed. The specific dosage can be used according to the occurrence of the disease and the instructions for the use of the drug. Rust 1 Elimination of host plants, such as Euphorbia weeds and other leguminous weeds, to reduce the host, do a good job in field management, eliminate diseased plant bodies. 2 The diseased grassland should be castrated in time and should not be harvested. 3 Select cultivars resistant to rust. 4 drug treatment. For the diseased grassland, use 20% of rust-free emulsifiable concentrate to be sprayed 200 times to 400 times, spray once every 10 days to 15 days, and spray 2 times to 3 times. The effect of using diuretic sodium is also good, 200 times to 250 times the liquid spray, spraying the initial incidence, spraying once every 7 days to 10 days, 2 to 3 times can be cured. When spraying drugs for the treatment of rust, care should be taken not to mix it with lime, copper sulphate, ferrous sulphate, etc. to avoid formation of insoluble salts and to reduce the efficacy. Brown spot is used for cleaning and disinfecting seeds, and reasonable fertilization is applied to maintain reasonable proportions of N, P, and K fertilizers, so as to improve the disease resistance of the plants. When a large area occurs, it can be sprayed with Bordeaux mixture and lime sulfur mixture for control. However, when using this method for prevention and treatment, it should avoid mixing with rosin mixture, lead arsenate, cotton soap oil, copper and mercury preparations. In addition, the use of this method is not effective in high temperatures in summer and low temperatures in early spring. This kind of medicine has a certain degree of corrosiveness. After using the medicine, clean the skin with clean water and clean the container of the medicine. Powdery mildew Both leguminous and gramineous grasses can infect this disease. The diseased plants showed white moldy layers on the leaves, stems, and pods. In the later stages of infection, dark brown cystoid shells appear at these sites, which are severely affected by large temperature difference between day and night and high humidity. This can result in a 50% reduction in grass production and a 30% reduction in seed production. Select disease-resistant varieties and timely clean up field strains. Lime sulfur compounds may be sprayed at the time of onset, 1000 times diluted thiophantine 50% wettable powder or carbendazim 10% wettable powder for field spraying. Sclerotinia is used to deep-flood the places where the grass is to be planted to prevent the germination of sclerotia. The seeds of the pasture are sown with salt water with a specific gravity of 1.03 to 1.10 before sowing to remove the mixed sclerotia in the seeds and then sow the pasture. After planting grass, in the summer and fall season, can be used to spray thiophanate-methyl, carbendazim and other fungicides, control medication 2 to 3 times, medication interval of 15 days is appropriate. For severely affected land plots, it should be reversed. Dodder (Yellow skein) Control methods: (1) Strengthen quarantine to prevent the dissemination of dodder seed with pasture seeds. 2 Use grass seed that has not been infested with Cuscuta ssp. In order to achieve this goal, a forage seed field should be established that does not cause any harm to Cuscuta. 3 Castration or removal of infected plants, especially if the removal of the seedlings before the seedlings are hardened or castration is an effective method to prevent the spread of semen. 4 Spray with 1.5%-2% dinitro-o-cresol and dinitrophenol solution to prevent dodder from occurring.