How to prevent and cure root rot of rhododendron?

How to prevent and cure root rot of rhododendron? Root rot is a serious threat to rhododendron, although its incidence is not high, but the mortality rate is very high, so we must pay attention to the prevention and control of root rot in the cultivation and management of rhododendron. Root rot is a soil-borne disease caused by Fusarium oxysporum, which mostly occurs in the roots of rhododendron, because these parts are often wet, lack of sunlight, and Fusarium oxysporum fungi are active frequently. Once it invades the cortex, it will soon cause rot, watery brown spots and soft rot will appear on the roots, and then rot and peel off, the xylem is dark brown, and the bark is grayish white gradually, and will spread gradually. "then it extends to the whole cortical necrosis of the trunk, cutting off the transport of nutrients and water, so that the top young leaves gradually dry up, and from top to bottom, the branches and leaves wilt, lose water and dry up, resulting in the death of the whole plant. For the prevention and control of root rot, the following measures should be taken: Fusarium oxysporum fungi survive on the plant residues in the soil and still have infectivity in case of suitable hosts within several years, where alkaline soil, high humidity and high temperature are conducive to the development and spread of the disease, so dead plants and basin soil should be treated in time after diagnosis. The adjacent plants can be soaked or eluted with 0.1% potassium permanganate and washed with clean water before potting, and the basin soil can be sprayed with 1000 times of topiramate in advance. Attention should be paid to improving site ventilation, increasing light in the morning and evening, increasing application of potash fertilizer and improving disease resistance. Smear the trunk with 200 times topiramate around May every year, once every 7 to 10 days, three times in a row to prevent infection. Click to get more azaleas planting techniques click to get more flower planting techniques