Jade Plant Sedum
Sharing the planting content of the succulent plant Jade Plant Sedum (Sedum morganianum), the prevention and control of the crown rot disease, the following editor will provide you with detailed answers.
Symptoms Also known as Five Jade Plant, Squirrel Tail White绢 Disease. Initially, a dark brown lesion appears at the base of the stem near the ground. By removing the surface soil, it can be seen that the neck and roots begin to turn brown and rot. There is white绢-like mycelium on the surface soil and the base of the stem, which eventually turns white and forms small sclerotia like rapeseed due to the entanglement of the mycelium, causing the cortex of the diseased part to collapse and the aerial part to turn yellow and droop, eventually leading to the death of the whole plant.
Causal Agent Sclerotium rolfsii.Sacc., known as the neat sclerotium fungus, belongs to the Deuteromycetes. The sexual state is Athelia rolfsii (Curzi) Tu. & Kimbrough, known as the Rolfsii Athelia, belonging to the Basidiomycota. On the PDA medium, the mycelium is white, luxuriant, and extends radially; the mycelium is 2-8 μm thick, branches not at right angles, and has septa; the sclerotium is initially milky white, then turns light yellow to brown or dark brown, spherical to ovoid, 1-2 mm in size, smooth and glossy on the surface. The surface layer of the sclerotium is composed of 3 layers of cells, the outer layer is brown, the layer below the epidermis is pseudo-parenchyma, and the middle is loose hyphae tissue.
Route of Transmission and Incidence Conditions The fungus overwinters in the soil with the sclerotium or rhizomorphs left in the residual body of the disease. In the following year, when conditions are suitable, the sclerotium or rhizomorphs produce mycelium to cause initial infection. The绢-like mycelium produced by the diseased plant extends and contacts the adjacent plant to cause secondary infection, causing it to spread.
Control Methods
(1) Careful maintenance, using well-drained sandy loam soil. In the hot and humid summer conditions, pay attention to ventilation to avoid leaf drop and rot, do not water too much, keep the potting soil slightly dry, and the room temperature in winter should be higher than 10℃;
(2) After the onset of the disease, promptly replace the sterilized potting soil or soil;
(3) Spray, use a 50% Benomyl wettable powder 1000-fold solution or mix 0.4-0.45 kg of well-trained Trichoderma harzianum with 50 kg of fine soil, and evenly sprinkle it on the base of the diseased plant, which can effectively control the spread of the disease.
The detailed explanation of the prevention and control of the crown rot disease of Jade Plant Sedum (Sedum morganianum) shared above. I hope this article can bring you help in green plant management!