Protection of parsley common diseases
In the protected areas (greenhouses, greenhouses, and middle sheds), the production of parsley is increasingly serious because of the continuous expansion of planting area and the repeated planting of successive years. The main diseases are sclerotia, leaf blight, and root rot. We will introduce the characteristics of its occurrence and prevention methods to everyone. I. Sclerotinia In the protected areas, coriander sclerotia has a high incidence. The reason is that sclerotia can persist for a long time in the soil. The annual production of greenhouses provides favorable conditions for the propagation of pathogens. Therefore, S. sclerotiorum can be pathogenic during the whole growth period of cilantro. The peak period of greenhouse morbidity occurs in December and the peak period of greenhouse morbidity occurs. In April. The main symptoms are as follows: Infestation of the base of the stem or the branch of the stem. The lesion spreads upwards and downwards around the stem. When wet, the surface of the diseased part has white hyphae, and the cortex rots with black sclerotia. . The measures for preventing and controlling sclerotinia are simultaneous prevention and treatment, ecological control and drug control. Rotation or soil disinfection is performed in the affected area, and disease-free seed or seed dressing is used. After the shed was sprayed with 1,000 times the liquid sclerotia net 1 times, 10 days after the spray 1st, spray before and after the beginning of the spring for the third time, after every 7-9 days spray once. During the whole growing season, we must strengthen the ventilation and reduce the humidity to reduce the occurrence of diseases. Second, leaf blight The disease occurred in Chengan County, but once the disease began, the disease spread rapidly, causing serious harm. 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. This disease may be seed-borne bacteria, so we took preventive measures based on seed disinfection. The method was to soak seeds with 500 times solution of carbendazim for 10-15 minutes, rinse and sow. Followed by strengthening the management, in the early period of high humidity in the buckle shed should pay attention to venting moisture, found that the disease should be sprayed and controlled in time, the choice of agents are carbendazim 600-800 times, mancozeb 600 times, 70% Thiophanate-methyl 800-1000 times, chlorothalonil 500 times, more than two kinds of agents mixed use better. 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 as much as possible, and the humidity cannot be too long. 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, in the easy-to-infected land block can be combined with water poured into the triplex 300 times solution.
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