Occurrence Characteristics and Control Measures of Vegetable Diseases in Protected Areas

The diseases of the roots of peppers often cause the death of peppers, and severe cases are dead or even died. There are three main root diseases of pepper, namely, the epidemic of pepper, root rot and bacterial wilt. According to our investigation, 80% of diseases in root diseases, 5% of root rot, and 15% to 20% of bacterial wilt in the diseases of pepper roots. From the trend of incidence in recent years, the proportion of bacterial wilt disease has increased. Seen from the site of the disease, the epidemic mainly occurred at the base of the stem above the earth's surface. Initially, it developed water-stained lesions. After the expansion, it was a large lesion of 7 to 10 cm. The diseased epidermis turned black and brown, and the cortex was softened and rotted. The stem contracted. Root rot occurs below the surface and near the ground. It is mainly the rot of the plant's skin that is easily peeled off. Bacterial wilt occurs at the root tip, causing the vascular bundle to turn brown. From the perspective of disease conditions, these three diseases are all soil-borne diseases and spread by running water. Affected by the soil temperature, the incidence is high around 25°C. In the solar greenhouse, a large number of occurrences occurred from September to October of the year before and from late March to April of the year. Especially at the beginning of April, due to the warming of the ground temperature, it was suitable for the reproduction of germs, and it was on the market for peppers. At this time, if the water was not watered, the peppers would not be long, and a large amount of water would die. The prevention and control of chili root disease should be mainly prevention and prevention and control. Starting from seedling raising, taking all aspects of the disease, and using drugs for symptomatic treatment, you can get a multiplier effect.
First, nursery bed soil disinfection treatment greenhouse pepper in September when the nursery, the ground temperature at 25 ~ 28 °C, it is the onset of root disease is appropriate, we must do a good job of soil treatment. The seedling bed soil was selected from the Daejeon soil that had not been planted with eggplant vegetables for 2 years. After the seedbed was in good condition, it was prepared according to the seedbed area of ​​2 meters per meter. 70% EB manganese zinc WP for epidemics, 50% carbendazim WP for root rot and 70% DT wettable powder for bacterial wilt. According to the area of ​​the seedbed, take the medicine and mix it together. Add 1 kilogram of dry fine soil and mix it. Sprinkle it onto the sorghum surface, cut the smashing and smashing, then water, sprinkle the seeds, cover the soil and cover the film. This can prevent the occurrence of these three diseases and seedling stage collapsed seedlings at the same time.
Second, seedling seedbed soil treatment according to the size of seedlings and seedlings, then divided by rice seedlings, respectively, with 10 grams of the above three kinds of powder, and then mixed with 10 times the dry fine soil, sprinkled in a good seedbed, The same plan, squatting, and then according to the spacing requirements of the ditch, pouring enough water, the water is not infiltrated immediately when the seedlings, soil and cover film.
Third, when the colonization when planting the application of greenhouse pepper planting period is generally in the end of January, before planting, according to every 1000 points prepared phosphorus manganese zinc 0.5 kg, carbendazim 0.5 kg DT0.5 kg. Mix 15 kg of dry fine soil and mix. When planting, evenly spread the medicine and soil into the planting hole. Generally, a medicine soil can be sprinkled with 4 points. After spreading, it can be planted and watered.
Fourth, the application of heavy-duty sheds in the whole area is relatively heavy, and if possible, it is best to turn it over. If it is not, it is necessary to deepen the sun on the one hand, increase the application of organic fertilizers to increase the resistance of the plants, and on the other hand, apply pesticides throughout the shed to prevent them in advance. The variety of its medication is the same as above, and it is calculated according to the cultivated area, and 10 grams per meter is used. After deep-leveling before planting, add 10 times the amount of fine dry soil to the ground and spread it evenly on the ground plane. The entire greenhouse application also applies to severely affected land.
V. Irrigation and Control at the Early Stage of Irrigation Every year from late March to April of the year, it is the peak period of the disease. At this time, according to the number of peppers, use the above three kinds of medicines, respectively, according to the amount of 500 times with good irrigation. The diseased seedlings and surrounding seedlings were poured into the roots at a dose of 0.5 kg per tree, and the rest was filled with 0.2-0.3 kg of liquid per hole. Once a day for 10 days, irrigation is repeated for 2 times. After irrigation, watering is not provided temporarily, which can basically control the spread of diseases.

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