Harm and control of powdery mildew of Angelica sinensis
The pathogen of powdery mildew of Angelica sinensis (ErysipheSP.) belongs to ascomycetes subphylum powdery mildew. The closed capsule accumulates and is buried in the mycelium, spherical or oblate, black or dark brown. The obturator shell contains 6 sub-cysts of 3 Mel. The ascus is subglobose, ovate, colorless, short stalked, thick membrane, and contains 6 ascospores. Ascospores are oval, colorless and transparent, unicellular.
The main results are as follows: 1. the harmful symptom is harmful leaves. At the initial stage of the disease, gray-white powdery disease spots appeared on the leaf surface, then expanded and converged into large spots, and small black particles appeared, and finally the leaves turned yellow and withered.
2. The regularity of the disease occurs when it is hot and dry in summer. The pathogen overwintered on the diseased remains or seed roots in closed cysts or mycelia. The overwintering closed cysts emit mature ascospores in the coming year for primary infection. The overwintering mycelium directly produced conidia in the second year. During the growth of Angelica sinensis, mycelia, conidiophores and conidia were continuously produced on the outer diseased leaves, and the conidia were re-infected by airflow transmission. The optimum temperature for spore germination of Angelica powdery mildew was 18 ℃ ~ 30 ℃, the humidity was more than 75%, and the incubation period was 2-5 days. When the air relative humidity is low and there is no water film on the plant surface, the conidia can still germinate and invade, causing harm. Lack of water in soil, poor ventilation, extensive management, weak plant growth or overdense branches and leaves are all conducive to the occurrence of the disease.
3. Control measures ① seed treatment: soak the seeds in 500x formalin solution for 5 minutes or soak the seeds for 2 hours. ② pulled out the diseased plant in time and burned it centrally. ③ implements crop rotation to avoid continuous cropping. At the initial stage of the onset of ④, 1000 times of methyl topiramate or 65% of methylene thiophanate was sprayed every 10 days or so for prevention and treatment, for 3 consecutive times. ⑤ strengthens the field management and enhances the disease resistance of plants.
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Angelica sinensis harvest and processing
When the leaves turn yellow in early October, cut off the aboveground and let the sun shine to the ground, promoting the root to mature. Dig Angelica sinensis in late October, start digging from one end of the ground, and dig as much as possible. After digging, combined with ploughing, pick up the missed medicine again. When it is collected and dug, shake the wet soil in time, pick out the diseased and rotten roots, break off the residual petiole, wait for the water to evaporate slightly, tie it into a flat handle weighing 0.5-1 kg, and put it in a dry and ventilated room or in a special smoke shed. The fumigation shed is 1.3-1.7 meters high, covered with bamboo strips, and Angelica sinensis will be leveled.
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Angelica sinensis and Liuhuang decoction in the treatment of hidrosis in livestock
Night sweats are mostly caused by yin deficiency and heat disturbance, and the heart fluid cannot be collected and stored. Yin deficiency and internal heat of livestock, during the day Wei Qi solid in the surface, although the internal heat steaming Jin can not sweat, at night Wei Qi line in Yin Fen, and no Yang Qi support, body fluid can not be hidden, diarrhea into night sweats. Treatment principle: nourish yin and clear heat, collect yin and stop perspiration. Prescription: Radix angelicae Sinensis, Radix angelicae Sinensis, Radix Scutellariae, Cortex Phellodendri, Radix Coptidis, Radix Astragali, Radix Ephedrae, oyster, Ephedra root and floating wheat were each 50 g, 40 g, 100 g, 70 g, 70 g, 80 g, 50 g, 40 g, 30 g, 100 g, 70 g, 70 g, 80 g, 80 g, 50 g, 40 g, 30 g, 100 g, 70 g, 70 g, 80 g and 80 g, respectively.
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