Autumn is the multiple occurrence period of Isatis disease, and when the disease is severe, it will affect its yield and quality. Prevention and control of Radix Isatidis must be treated with the right medicine in order to achieve a multiplier effect. The symptoms and control methods of several common diseases that are commonly found in the fall of Radix Isatidis are described below:
Downy mildew symptoms: damage the leaves. Plants on the lower part of the plant near the ground attack first and gradually spread to the upper leaves. At the beginning of the disease, only the back of the leaves appeared grayish-white moldy, and there were no obvious lesions on the leaves, and the damaged part was uneven. Further development led to greenish round spots, which later changed into brownish brown spots. The edges of the leaves become brown and dry until the entire leaves die. This disease field is prone to humidity when the humidity is high and the temperature is high. Prevention and treatment: timely drainage after heavy rain drainage, to maintain a smooth sulcus; excessive branches and leaves should be removed to maintain ventilation and light; the initial stage of the disease with a 1:1:100 Bordeaux mixture or 50% carbendazim spray 800 times Face, once every 7 days, even spray 3 to 4 times.
Root rot symptoms: endanger the roots. When it occurs, the roots of the fibrous roots and the root tip of the main root are first to be victimized, which is dark brown and brown to the root vascular bundle. In the later period, the whole roots were rotted and the plants on the shoots were wilting and eventually died. The disease is prone to occur in the late and late stages of growth. Prevention: During composting, more cooked organic fertilizer is applied to enhance the resistance of plants; at the beginning of the disease, a disease point is poured with 5% lime milk, and the disease area is sprayed 1 to 2 times with a 50% tetromycin 600 times solution; Pull out in a timely manner, take out of the field, concentrated burned or buried.
Symptoms of Sclerotinia: Harm the stems and leaves. The leaf was initially immersed in a dark-brown lesion, and the entire leaf was rotted, leaving only the veins. When the stem was damaged, the cortex rotted and the stalks were disrupted. The mycelium was covered with hyphae. There were black murine sclerotia in the inside and outside of the stem and leaves. The sclerotia were the most common at the basal surface of the stem, and the whole plant withered and died in the late stage. The disease is highly prone to drought and drought. Prevention: rotation at the time of sowing to reduce the spread of germs; pay attention to timely irrigation when the weather is dry, suitable for the morning or late evening; early onset of spraying with 50% thiophanate-methyl 800 times or 65% dexamethasone 600 times spraying the leaves , Once every 5 days, even spray 3 to 4 times.
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