Identification and control of lotus root brown scab
Brown rot of lotus root is widely distributed and occurs everywhere, but it is only harmful to lotus root. 1. Pathogen: the disease is caused by the infection of Alternaria subphylum. The pathogen overwintered in the lotus root field with mycelium and thick spores, produced conidia at high temperature and humidity and spread by wind and rain. 2. Symptom identification: the pathogen of brown blight of lotus root only harms the leaves of lotus root, the disease spot is a small yellowish spot at first, and gradually expands into round or irregular brown spot, sometimes connected to each other into mass disease spot. 3. Disease conditions: the lotus root field is barren, the lotus root growth is weak, or the disease is most susceptible after the storm. 4. Prevention and control techniques: ⑴, cleaning lotus root field after harvest and destroying lotus root leaves and diseased bodies. ⑵, before the storm, lotus root field irrigation deep water to prevent wind damage, to avoid lotus root lodging. ⑶, strengthen the management of lotus root field, cultivate strong seedlings, and enhance the disease resistance of lotus root. ⑷, choose 25% triadimefon (triadimefon) wettable powder 2000-4000 times liquid at the beginning of the disease, or spray prevention and treatment with the same amount of Bordeaux solution, once every 10 days, 3 times continuously.
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Why does the lotus root rot?
Topdressing can be applied for 2-3 times. The first time when the standing leaves grow 1-2, the second time before the row is sealed, and the third time when the rear leaves appear. The first application of manure 2000-4000 kg or urea 15 kg, the second application of compound fertilizer 20-25 kg, the third application of 10-15 kg urea, early cultivation.
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Occurrence and control of brown class disease of lotus root
Brown class disease is the main disease of lotus root, which is widely distributed. It can occur in spring, summer and autumn. Generally, the diseased plant accounts for 30%-50%. In severe cases, the incidence rate can reach more than 80%, which significantly affects the yield and quality of lotus root. 1. Symptoms this disease mainly harms the leaves and petioles of lotus roots. The leaves produce small brownish green at the initial stage of the disease.
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