MySheen

Control of spot disease of Pleurotus ostreatus

Published: 2024-12-23 Author: mysheen
Last Updated: 2024/12/23, 1. The main symptoms of this disease are damage to leaves and petioles. Leaf disease spot yellowish brown to brown, showing polygonal, oval or irregular shape, slightly wheel-shaped, disease spot surrounded by yellowish green or green-brown halo, disease spot sometimes linked to each other into a large disease spot, serious can make the leaves yellow and dry. Petiole disease often produces short brown spots, and gray mold grows on the surface of the spot when the humidity is high. two。 The route of transmission and the regularity of the disease is caused by the infection of Cercospora, a subphylum fungus, which is mainly caused by mycelium and conidia.

1. The main symptoms of this disease are damage to leaves and petioles. Leaf disease spot yellowish brown to brown, showing polygonal, oval or irregular shape, slightly wheel-shaped, disease spot surrounded by yellowish green or green-brown halo, disease spot sometimes linked to each other into a large disease spot, serious can make the leaves yellow and dry. Petiole disease often produces short brown spots, and gray mold grows on the surface of the spot when the humidity is high.

two。 The route of transmission and the law of disease

The disease is caused by the infection of Cercospora, a subphylum fungus, which overwinters mainly in mycelium and conidia. The conidia were produced in the following year, which were transmitted by air flow and wind and rain, causing the disease, and the conidia were continuously produced on the disease spot for repeated infection. High temperature and heavy rain is suitable for the breeding and reproduction of pathogens, and it is generally easy to occur in the period of high temperature and rain in summer and autumn, especially in poor ventilation, lack of fertilizer and poor growth in the field.

3. Prevention and cure method

(1) Agricultural prevention and control: timely removal of disease and residue in the field, concentrated burning or deep burial; reasonable fertilization, pay attention to the combined use of nitrogen, phosphorus and potassium to avoid partial application of nitrogen fertilizer; scientific use of water, drainage and irrigation, improve ventilation conditions to facilitate the growth of Pleurotus ostreatus.

(2) Chemical control: spray control at the initial stage of the disease, you can use 75% chlorothalonil wettable powder 600 times liquid or 50% carbendazim wettable powder 600 times liquid spray.

 
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