In the greenhouse cultivation of cilantro, due to improper management, repeated planting and other reasons for years, it will cause high incidence of disease. The main diseases are sclerotia, leaf blight, root rot, and so on. Now we will introduce the characteristics of its occurrence and prevention methods.
I. Sclerotinia
In the greenhouse cilantro cultivation, the incidence of Sclerotinia is high. The reason is that sclerotia can exist for a long time in the soil. The annual production of greenhouses provides favorable conditions for the propagation of pathogens, so Sclerotinia can be pathogenic during the entire growth period of cilantro. The disease mainly infects the base of the stem or the tiller of the stem. The lesion expands around the stem and then goes upwards and downwards. When it is wet, the surface of the diseased section grows white mycelium, and then the cortex rots, with black sclerotia inside. To prevent or treat this disease, crop rotation or soil disinfection should be applied to the diseased area. Seedless seeds or seed dressings should be used. Spray 1,000 times of liquid sclerotia net for 3 times and spray for 10 days. Increase the air release and reduce humidity during the whole growth period. To reduce the occurrence of diseases.
Second, leaf blight
Once the disease occurs, the disease spreads rapidly and the resulting harm is severe. The main damage to the parsley leaves, the leaves become yellowish-brown after the disease, when the humidity is high, the disease department is rotten, and seriously invade the tender stems to the heart and leaves along the veins, causing a serious reduction in production. The disease may be seed-borne, so precautions should be taken to prevent seed disinfection. The method is to soak seeds with carbendazim 500 times for 10-15 minutes, rinse after sowing; followed by strengthening management, in the initial period of the buckle shed humidity When high, we must pay attention to put out the air to remove moisture; find the disease should be sprayed and controlled in time, the choice of agents are carbendazim 600-800 times liquid, mancozeb 600 times liquid, 70% thiophanates 800-1000 times liquid, one hundred Bacteria 500 times liquid and so on.
Third, root rot
Occurs mostly on low-lying, damp plots. After the onset of coriander roots, the main roots are yellowish-brown or brownish in color, with soft rot and no or almost no fibrous roots. The above-ground plants showed short stature, yellow leaves, and loss of commercial quality. The prevention and control method is to avoid planting on low-lying land, and the humidity cannot be too long; the chemical treatment is mainly based on soil treatment. It can use carbendazim 1 kg mixed soil 50 kg, spread in the sowing ditch before sowing, and can be combined in the easy-to-fuse land mass. The watering agent was poured 300 times with a weighting agent.
Fourth, mosaic virus disease
Planting parsley in greenhouses in winter is very easy to infect mosaic virus disease. Yellow mosaics appear on plants. The most serious diseases are heart and leaf, which can cause serious dwarfing of plants. They do not grow new roots, and do not grow new leaves. The longer the plants, the smaller the plants. Finally withered to death. Coriander mosaic virus mainly relies on aphid transmission, and the damage of aphids is likely to cause a rapid spread of mosaic virus disease. The prevention and treatment is to disinfect the seed. Soak the coriander seeds with 800 times solution of 50% Bromobromide isocyanuric acid for 2-3 hours to kill the virus latently in the coriander seeds, wash and drain, and then sow; Timely prevention and control of aphids. After the start of leaf development of the coriander seedlings, spray once every 7-10 days with 3% acetamiprid suspension agent and spray 3-5 times. Note that the virus activity can be controlled and sprayed every 15-20 days. The 0.1% zinc sulfate and 500% 5% nannanmycin mixture can significantly inhibit the virus activity in coriander plants.
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