Common diseases and control methods of parsley
The cilantro has a long history of planting in the Shanhaiguan District of Qinhuangdao City. At present, it has formed an annual planting pattern focusing on the production of protected areas (greenhouses, greenhouses, and sheds). However, with the continuous expansion of coriander cultivation area and the successive cultivation of coriander, the disease of parsley has become more and more serious. The main diseases are sclerotiorum, leaf blight, spot blight, root rot, and so on. Method introduced to everyone.
I. Sclerotinia
The occurrence of smut sclerotinia is most common in our region, especially in protected areas, the incidence rate can reach more than 50%. 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 prevention and treatment of sclerotinia disease in our district is based on the principle of prevention and treatment, ecological control and drug control combined with the following measures: crop rotation or soil disinfection. Seed dressing with disease-free seeds or drugs. After the shed was sprayed with 1000 times sclerotia net once, and then sprayed again 10 days later, sprayed for the third time before and after the beginning of spring, and then sprayed once every 7 to 9 days. During the whole growing season, we must strengthen the ventilation and reduce the humidity to reduce the occurrence of diseases.
Second, leaf blight and spot blight
These two kinds of diseases occurred in our area. However, once the disease occurred, the disease spread rapidly and the resulting damage was severe. The main damage leaves, the leaves become yellow-brown after the disease, when the temperature is large, the disease department is rot, serious down the invasive tender stems along the veins to the heart, resulting in serious reduction in production, so these two diseases should be particularly controlled. These two diseases 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 to 15 minutes, and rinse after sowing. 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 use of agents such as carbendazim 600 to 800 times liquid, mancozeb 600 times liquid, 70% A Chitobuzu 800 to 1000 times liquid, chlorothalonil 500 times, more than two kinds of mixed use better.
Third, root rot
Occurs on low-lying, damp plots. After the onset of parsley roots, the main roots are yellowish-brown or brownish, with soft rot. There is no or almost no fibrous roots. The roots of the plants are broken by hand. The plants on the shoots are short and the leaves are yellow and lost. Commerciality. 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. Root rot disease usually occurs before winter in October, so it should be controlled before the shed, mainly with 500 grams of Prec 500 times or 600 times burdock root irrigation.
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