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First, the symptoms
The lesions mainly occur on stems, occurring first in the near-surface part of the tender stems, initially as small, milky-white spots, after which they gradually expand into spindle-shaped or spindle-shaped small stain-like spots that gradually turn brown and the center is gray-brown. , depression, scattered small black spots (ie, conidia). When the lesions are severe, the entire plant grows. When the lesions circle the stems for one week, the whole plant will die.
Second, control methods
1, choose disease-resistant varieties, do a good job in seed treatment
At present, the foreign introduction of Mary Washington No. 500 is more resistant to stem blight. For preferred seeds, warm soaking or chemical treatment is performed prior to sowing. It can be soaked with warm water of 50°C for 10 minutes, and pay attention to pouring the seeds first and then stirring constantly to make the seeds evenly heated. Can also be used Fumei double agents such as seed treatment, has a good bactericidal effect, can reduce the occurrence of diseases.
2, a reasonable choice of plots
Asparagus is arranged in the soil with heavy weight, low-lying mats, near orchards, paddy fields, and other places; high-lying, loamy or sandy soil blocks have good drainage and ventilation, clean environment, and fewer diseases.
3, reasonable close planting
In Tianjin, it is appropriate to plant dense rows (row spacing is 180cm and plant spacing is 50cm). Excessive density or improper intercropping within 1-2 years after planting will result in mutual obscuration, forming a hot and humid microclimate, which is conducive to disease occurrence. It is particularly emphasized that it is strictly forbidden to make any crops in the field.
4, timely and rational fertilization and drainage
Asparagus has a large amount of growth and requires a large amount of fertilizer. Therefore, it is necessary to apply fertilizer in time, and in particular, to use enough base fertilizer. Apply 5,000 kg of organic fertilizer per 667m2 to see if the seedlings are topdressing fertilizer. Asparagus is a hi-phosphorus potassium crop, and care must be taken not to apply nitrogenous fertilizer to ensure the nutritional needs of asparagus, to grow robustly, and to increase its resistance to disease. In the rainy season, timely drainage is required to reduce the humidity of the shoots and reduce the spread of germs.
5, timely cultivation and weeding
The occurrence of grass damage not only affects plant growth, but also exacerbates disease spread. Weeding and weeding to remove dead stems and leaves in a timely manner will facilitate ventilation and light transmission, and reduce the occurrence of diseases.
6, do a good job of wintering prevention
In winter or spring, clearing work should be done. All remaining stems and leaves on the ground should be cleared out of the field and burned to reduce the source of bacteria. Before and after spraying the soil or stem and dish with 50% carbendazim 1000-1500 times solution or 70% thiophanate-methyl 1000--1500 times before and after April, the primary infestation source can be greatly reduced, and the disease can be controlled as soon as possible to prevent and control as soon as possible.
7, in the peak period of disease, adhere to chemical control
The high temperature and high humidity during the rainy season in the July-August period in Tianjin is the peak period for the incidence of asparagus stem blight, and must be sprayed once every other week. The commonly used agents are: 75% chlorothalonil 600 times; 80% dexamethasone 600--800 times; 70% thiophanate-methyl 1000 times. Due to stem maturity affecting its susceptibility, the onset was first on the tender stem. Therefore, when spraying, it must be targeted, and the newly emerged tender stem should be the main target in order to strive for better control effects. Http://
Asparagus stem blight symptoms and prevention methods
Asparagus is a valuable vegetable with excellent taste. With the continuous improvement of people’s living standards, the demand for asparagus in domestic and foreign markets is increasing. Because asparagus has strong drought tolerance, it is particularly suitable for planting in Tianjin. However, with the increase in the number of years of planting, the increase in the area, the occurrence of stem blight worsened, and the incidence of some plots reached 80%, or even the destruction of the whole field, seriously affecting the healthy development of asparagus planting. Therefore, early detection of disease symptoms and the timely adoption of comprehensive prevention and control measures are the main measures to prevent both the symptoms and the symptoms.