First, erythema: the leaves produce purple-brown near-circular small spots, and then gradually expanded into irregular large spots, and more with ring-shaped ring pattern, after the moldy material grows.
Second, gray mold: The disease occurs in leaves, stems, flowers. The leaves produce brown round spots with irregular ring patterns, and when the weather is wet, gray mold grows on the spots. A brown pattern is formed on the flower, and the flower buds cannot be opened or rotted and become brown after being damaged.
Third, the brown spot: the initial appearance of small purple-brown leaf spots, after the expansion of the formation of light brown and even dark brown ring pattern.
4. Rust: The leaves of peony produce small yellow-brown spots on the leaves during flowering, and soon the spots show orange-yellow pustules. After the rupture, orange-yellow powders are scattered, and the peony grows with fine wool hairs on the back of the leaves.
5. Anthracnose: There are round or irregular yellow-brown depressions on the leaves, dark brown on the edges, and black dots in the middle.
Sixth, white peony disease: This disease occurs in the peony root neck. In the initial stage, white mycelium was formed on the surface of the root and neck, and watery brown spots appeared. Brown sclerotia grow on later stages of the disease, at which time the plant's aboveground parts gradually weaken and die.
The prevention and control method of the above diseases is: dipping the roots with 500 times 70% thiophanate solution for 10 minutes before planting. After onset, the roots were watered with 400 times 50% solution of dexsenam, or sprayed with 50% carbendazim 800 times. Rust disease must be sprayed with 300 times the enemy rust sodium. The pests of peony are not much, mainly scale insects, cockroaches, leaf roller moths and so on. The bite of peony roots and necks is more common and serious. When larvae and other underground pests are harmed, 5% phoxim granules (2 kg per acre) can be uniformly applied to the soil surface, and then turned into the soil (about 20 cm), and the control effect is good.
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Cas 183321-74-6,Erlotinib Intermediates,Ip Erlotinib
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