Control methods of branch blight of asparagus

[symptoms] first occurred on the weakening branchlets, the disease spot was filamentous or spindle-shaped at first, and gradually extended to the upper branches, resulting in leaf shedding. The susceptible branches gradually become light brown, and finally become light yellow. When the environment is wet, there are dense black dots on the susceptible branches.

[pathogen and incidence regularity] is a fungal disease, the pathogen is stem mildew fungi, mostly overwintering on diseased plants and diseased bodies, and the disease is easy to occur when it spreads with wind and rain, infects and harms the plant in the following year.

[prevention and control methods]

1. Planting in a well-ventilated and well-drained environment; appropriate application of phosphorus and potassium fertilizer; not suitable for sun exposure and excessive shade cultivation.

2. If diseased branches are found, cut off them in time.

3. Drug prevention and treatment: 1% Bordeaux solution can be sprayed at the initial stage of the disease, or it can be sprayed with 1500 times of potassium permanganate.

Control methods of branch blight of asparagus

Branch blight harms asparagus branches and causes twigs (commonly known as asparagus leaves) to fall off, and when serious, the whole plant wilts and dies. The pathogen of branch blight is a fungus of Coelospora. In the case of the decline of plant vitality, the pathogen often invaded from the upper part of the weak branchlets; the disease spot was spindle or filamentous at first, then gradually expanded and spread up and down, or around the stem so that the upper branches of the plant withered and the branchlets fell off. After a certain period of time, the susceptible branchlets gradually fade to light brown, then yellowish white, with dense black spots above; the small black spots in these withered branches are the conidia of the pathogen. Conidia born under the epidermis, oblate or globose, dark brown; conidia colorless, unicellular, subelliptic. The pathogen overwintered by the conidia attached to the damaged site, and the conidia spread in the next year when the environment was suitable. The disease usually occurs from July to November in Guangdong, when the weather is hot and dry. Poor cultivation management, strong direct sunlight or excessive shade, and weak plant growth are the causes of the disease.

Control of branch blight of asparagus

1. Eliminate the source of infection. Once it is found that the branches of asparagus are infected by bacteria, the dead branches should be cut off in time and then burned centrally. In order to prevent the cut from being infected by bacteria, the cut should be coated with Vaseline after alcohol disinfection.

2. Improve the cultivation conditions. To control the light conditions, potted asparagus should be placed in a ventilated and sunny place, but not under strong direct sunlight, and strengthen fertilizer and water management to make the plant grow healthily and improve the ability of disease resistance.

3. Drug prevention and treatment. At the initial stage of the disease, spraying 1% Bordeaux solution, or 75% chlorothalonil 800x solution, potassium permanganate 1500 times liquid, has a better preventive and germicidal efficacy.

Control of branch blight of asparagus

Asparagus branch blight was first caused by weakening twigs. After a period of time, the susceptible branches. The pathogen is a fungus of Chlorella, Pho ma sp. The pathogen overwintered on diseased plants and remnants by conidia. In the following year, when the environment was suitable, conidia infection occurred. When the plant growth is weak, the pathogen is the first to invade the area where the plant is not growing well. The disease often occurs from July to November. If a diseased branch is found, it should be cut off immediately. 2. 1% Bordeaux solution was sprayed at the initial stage of the disease. During the onset period, after cutting off the diseased branches, spray 75% chlorothalonil wettable powder 800x liquid, or potassium permanganate 1500 times solution.