Control of Root Rot of Rhododendron
Root rot is a serious threat to rhododendron. Although its incidence is not high, the mortality rate after infection is very high. Therefore, attention must be paid 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:
Half-known Fusarium fungi live on plant residues in the soil and still have infectivity in case of suitable hosts within several years. Alkaline soil, high humidity and high temperature are all conducive to the development and spread of the disease, so after diagnosis, dead plants and basin soil should be treated in time.
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.
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Prevention and control of rhododendron brown spot
1. The primary reddish-brown dot on the diseased leaf gradually expands into a nearly round, or polygonal spot limited by the vein of the leaf, with a diameter of 1mm to 5mm, dark brown; sometimes gray-white in the center, the edge is not obvious. The disease spot leaves are one-sided deep and the back color is light, and the disease spots on the leaf edge can be connected to each other, and most of them produce gray-black mildew spots on the surface of the disease part when it is wet. 2. The pathogen of rhododendron brown spot is CercosporarhododendriFerraris, which belongs to Trichoderma. The gray-black mildew spot on the disease spot is
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Rhododendron rot
Symptoms rhododendron flower rot only harms flowers, resulting in shortened florescence, flower sagging, early withering and shedding. After the petals are infected, the diseased part loses its luster, is waterlogged, softens and fades, and finally turns brown, rotten and black, and a gray mildew layer grows on the surface when it is wet, affecting the ornamental. The pathogen and incidence regularity of the disease belongs to semi-known bacteria subfilaria fungi. The bacteria form sclerotia on the rotten flowers, and the sclerotia fall into the soil with the abortive flowers to overwinter. During the flowering period of the following year, conidia are produced, which are dispersed by wind and rain or spread by air, and sprout in flowers.
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