First, the disease. Asparagus pests and diseases mainly include: stem blight, root rot, brown spot, blight, and shoot blight. (1) Stem blight: The main parts of the stem blight are stems and shoots. The initial stage is on the main stem, more than 50 cm away from the ground, infiltrating fading spots, and then forming a light blue and even gray-brown, while expanding to form a spindle or strip . The lesions are reddish-brown at the edges and grayish-brown in the middle. Afterwards, the lesions can still be expanded. There are large lesions with reddish-brown edges and grayish-white lesions on the edges of the lesions. The dense black needlepoints are conidiospore. The lesions can penetrate deep into the pith and wait for one week to circumnavigate the stem. Control methods: Take comprehensive measures to compress the bacteria source base and prevent it in advance, that is, drug-based, comprehensive prevention and control, prevent disease from disease, increase production and increase income. 1. Covering the field with plastic film or straw can prevent the spread of rain. 2, appropriate control of plant growth, not excessive luxuriant. 3, cleaning. Thoroughly removing and burning diseased plant residues is an important step in controlling the disease. 4, increase potassium fertilizer. Potassium fertilizer 20-40 kg per acre, disease prevention effect of 19.88-44.55%.5, more organic fertilizer. According to the requirement of asparagus fertilizer, the ratio of nitrogen fertilizer, phosphate fertilizer and potash fertilizer should be 10:7:9; 5,200 kg of organic fertilizer should be applied every year, and attention should be paid to cultivating and weeding, and drought relief. Second, root rot: root rot is invaded in the fleshy roots, resulting in root soft tissue and rot in the column, leaving only the epidermis. The surface is red-purple, and is heavily coated with mycelium, resembling purple velvet. After the onset of stem growth dwarf stems become yellow so that the whole plant withered. Control methods: In the past, it was the land of orchards and woodlands. It was not appropriate to plant asparagus for 3 years because the decay of roots often became the breeding ground for pathogens. The management of fertilizers and water was strengthened, organic fertilizers were added, and the growth was strong, which could significantly enhance disease resistance. Found that the diseased plants should be excavated in time, and use 20% lime water for soil disinfection. Third, brown spot: mainly occurs in the seedling stage and soon after planting the young plant stems, branches and mimicry leaves, causing the death of the mother stem, leaves yellow, fall off. At the time of onset, most of the purple-brown spots appeared, the lesions gradually expanded, the central area became gray, and the edges were purple-brown and round. The diseased gray-white parts were densely conidial black conidiospores, and white powdery spores were scattered when wet. Most of the lesions on the stem are enlarged and connected to become oval big spots. Control methods: According to the method of controlling stem blight, while controlling stem blight, brown spot has also been well controlled. D. Blight: The major damage is the seedlings and young plants. The pathogens mostly infect the stem bases and roots of the seedlings from the topsoil, and the affected part is overflowing black. Control methods: Former crops are cotton, potato and other diseases that are easy to infect the disease and should not be used as breeding grounds. Fill the bottom water before sowing, and do not apply water or water for less than 20 days after the seedlings emerge. In the early stage of disease, pouring 45% of Schnerin 2000 times to irrigate the root can play the role of sterilizing and protecting seedlings. 5. Blight disease: Small spots are formed on the leaves, branches and stems. In wet conditions, the surface of the lesion grows black moldy material. The lesions formed on the tender stems are lighter in color, the leaves of the disease are expected to fall early and the young shoots die. When the damp shoots are dry, the young shoots show dark brown rot symptoms. Control methods: The main chemical agents to prevent and control. The use of dual-Jisheng or mancozeb, will have a good control effect. Prevention and control of agriculture is mainly to do a good job of winter and spring cleaning. Do not grow onions and garlic in or near asparagus fields. In short, the occurrence of asparagus pests and diseases is affected by many factors. Only by formulating reasonable cultivation measures and timely defense can we effectively reduce the occurrence and harm of pests and diseases, and achieve high yield, quality and efficiency of asparagus. Steroids Powder,Raw Steroid Powder,Steroid Raw Powder,Steroid Protein Powder Shaanxi Hongbaiyi Biotech Co., Ltd. , https://www.sxhongbaiyi.com