How to prevent and treat root rot in azaleas? These methods are very practical
How to prevent and treat root rot in azaleas? Please give an introduction. For azaleas, root rot is a serious threat. Although its incidence rate is not high, the mortality rate after infection is very high, so the prevention and treatment of root rot must be taken seriously in azalea cultivation and management. Root rot is a soil-borne disease caused by Fusarium fungi...
How to prevent and treat root rot in azaleas? Please give an introduction
For azaleas, root rot is a serious threat. Although its incidence rate is not high, the mortality rate after infection is very high, so the prevention and treatment of root rot must be taken seriously in azalea cultivation and management.
Root rot is a soil-borne disease caused by Fusarium fungi. It mostly occurs at the rhizome parts of azaleas, because these parts are often damp and lack sunlight, and fungi of the genus Fusarium (Deuteromycetes) are highly active there. Once they invade the cortex, they soon cause rot. Water-soaked brown spots and soft rot appear on the roots, followed by decay and peeling of the bark. The xylem turns dark brown, and the bark gradually turns grayish white and spreads step by step, "then expands until the entire cortex of the trunk necrotizes, cutting off the transport of nutrients and water, causing the young leaves at the top to gradually dry up, and from top to bottom, the branches and leaves wilt, lose water and dry up, until the whole plant dies."
For the prevention and treatment of root rot, the following measures should be taken:
Fungi of the genus Fusarium (Deuteromycetes) survive on plant residues in the soil, and within several years they can still infect suitable hosts when they encounter them. Alkaline soil, high humidity, and relatively high temperatures all favor the development and spread of the disease. Therefore, after diagnosis, dead plants and potting soil should be dealt with promptly.
For nearby plants, the whole plant can be soaked or rinsed with 0.1% potassium permanganate, then rinsed with clean water before being repotted. The potting soil can be sprayed or watered in advance with a 1000-fold dilution of 70% thiophanate-methyl.
Attention should be paid to improving ventilation at the site, increasing light in the morning and evening, and applying more potassium fertilizer to improve disease resistance.
Around May each year, apply a 200-fold dilution of thiophanate-methyl to the main trunk, once every 7 to 10 days, for three consecutive times, to prevent infection.
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