How does asparagus cultivation prevent stem blight?

What harm does stem blight do to asparagus? How to control stem blight in asparagus planting? We also asked experienced netizens to help introduce that asparagus stem blight is a widely distributed and serious destructive disease, known as asparagus cancer, which often causes large-scale destruction in the rainy summer season. the planting network has sorted out the harm and control methods of asparagus stem blight, which are listed below for netizens' reference. The harm of stem blight to asparagus planting: the main parts of the disease are stems and branches, but not leaves. In the early stage of the disease, there were small water-stained bronze spots, which gradually expanded to form a fusiform edge reddish brown or brown plaque; in the middle and later stage, the center of the lesion became grayish brown, slightly sunken, dense black spots, that is, conidium. The disease spot can go deep into the medulla and wait around the stem or branch for a week, and the upper part of the disease spot will dry up, lose water and die. The peak period of the disease was from July to September, and the overwintering stage entered in late October. The disease occurred for nearly 6 months in the whole year. Control methods of asparagus stem blight: method 1. Reducing pathogens is an important link in the control of asparagus stem blight. Generally speaking, the incidence of asparagus stem blight in new bamboo shoots is light, the number of bacteria in old bamboo shoots is large, and the disease is early and serious. The germs in the new bamboo shoot field mainly come from two sources, one is the seed carrying bacteria, and the other is the germs in the old bamboo shoot area spread with the wind or Rain Water. Therefore, keeping asparagus field clean and reducing the source of infection is one of the effective methods to control stem blight. Method 2. When planting asparagus, organic fertilizer and phosphorus and potassium fertilizer should be added, and the ratio of nitrogen, phosphorus and potassium should be properly controlled to 1 ∶ 0.6 ∶ 0.8. Applying a certain amount of organic fertilizer every year can increase the content of soil organic matter, loosen the soil, promote the healthy growth of asparagus root and stem and leaf, and improve the ability of disease resistance. Method 3. The principle of "prevention first" should be carried out in chemical control, and the tender stem should be sprayed in time in order to get good results. Spring combined with cleaning the countryside with more than 50% carbendazim 1V 300 times solution to irrigate roots; in the initial stage of stem blight from May to June, 80% Dasheng 1V 400 times and 75% methyl thiophanate 1 500 times can be sprayed once every 7 to 10 days, and once in 5 to 7 days during the peak period from July to September, mainly with stems and branches 60 cm above the ground, supplemented by upper branches and leaves, spray evenly and spray once after rain. The above agents should be used alternately to avoid drug resistance. Click to get more asparagus planting techniques click to get more vegetable planting techniques