Main Diseases and Prevention and Treatment of Chinese Medicinal Materials

Root rot disease occurs in summer with high temperature, high humidity, and low waterlogging. Root rot mainly damages the roots, causing some or all of the roots to discolor and rot. The stems and leaves can't droop or dry up because the roots cannot supply moisture. Select well-drained plots for rotation, turn the soil over, and use the initial stage of watering with 50% lime water or disinfect with 1% ferrous Sulfate to control root rot. Leaf spot disease occurs when there is high temperature, high humidity, poor ventilation in the field, and weak plant growth. It forms yellow-brown or purple spots with various shapes on the leaves. The later lesions expand and connect with each other. The leaves are seriously damaged and the leaves dry off. Rotation, disinfection of seeds or seedlings with carbendazim or mancozeb 600 to 1000 times, can prevent and treat the disease. The dampness of medicinal materials in damp and damp plots encountered low temperatures in early spring, and fertilizers that were not adequately cooked were susceptible to blight. The incidence of seedlings is more, and after infection, yellowish-brown lesions appear at the base of young stems near the soil surface, or the bases are all discolored and dry. The upper leaves and leaves are yellow and fall flat and die. Rotation, planting density is reasonable, in the early stages of onset of damping-off, with a special WP wettable powder 1000 times or mancozeb Mn 70% dry glue powder 300 to 350 times spray, or mixed with fine soil in the stem base, can prevent and control Blight. Rust is more prone to the disease in wet and foggy seasons where soil is moist and plants grow soft. At the time of onset, yellow or dark brown round or oblong lesions appeared on the stems and leaves, the latter lesions bulged, the epidermis was broken, and yellow or brown powder was scattered out. The lesions were broken and perforated, and the leaves died. Ditch drainage, to prevent the accumulation of water in the field, spraying 97% of the enemy's rust sodium 400 times or Bomi 0.3 degree lime sulfur in the early stage of disease. Early removal of diseased leaves can prevent rust. Black powder stems, leaves, spikes can be susceptible. The diseased stems and leaves were curved and deformed to form a small nodule. There were white tunica albuginea on the outside and later ruptured and black powder was scattered. If the disease is affected by the disease, it does not produce seeds. Rotation, seed disinfection, early removal of diseased plants, and clearing of fields after harvest can prevent smut. Sclerotinia mostly occurs in wet soils and low temperature plots. Roots and leaves can be susceptible. After onset, the stems and leaves were soft, the roots rotted, and the plants were lodging. When the humidity is high, a lot of cotton-like white hairs appear in the diseased part, and black rat-like sclerotia are formed later. Rotation, the exclusion of water accumulation in the fields after the rain, the removal of diseased plants, the dispersal of vegetation ash and lime powder into the diseased points, and the use of 600 times liquid of tetrobacter to control Sclerotinia sclerotiorum.

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