Diseases and prevention methods of peony

Peony Diseases : Leaf Mold

Leaf mold is a common disease of peony. In the early stage of the disease, purple-brown spots will appear on the leaves, and then gradually expand. The center of the spots is light brown, and the edges are dark purple-brown with wavy patterns. When the disease occurs in autumn, the markings on the leaves turn dark brown. This disease mainly occurs in April and May , and the chance of disease is greater in humid environments. Solution: Apply 800-1000 times diluted Bacteroidetes or Carbendazim in time, and pay attention to improving ventilation.

Peony Diseases: Sclerotium rot

White rot mainly appears on the soil surface. If you observe carefully, you will find white catkins appearing on the soil surface and rhizomes, and the plants will gradually wilt. The focus is on prevention of white rot, spray 500 times diluted carbendazim wettable powder once a month. Once the disease occurs, the diseased plants must be cut off in time, and new soil must be used and replanted.

Peony diseases: blight

The disease can attack leaves, petioles and stems. The disease usually starts from the lower leaf surface, with water-soaked spots appearing, gray-green in the center and dark green at the edges, and then the leaves wilt and die.

Solution: Spray 800~1000 times diluted thiophanate-methyl or carbendazim, or spray 400 times diluted copper amalgam for prevention and control.

Peony Diseases: Rust

Regularly spray 500 times diluted 65% Mancozeb wettable powder or 0.3 to 0.4 degree diluted lime sulfur mixture once every 10 to 15 days for 3 to 4 times in a row to achieve certain results.

Peony Diseases: Stripe Disease

Ring rot occurs on the leaves, initially appearing as brown circular spots that expand in concentric rings and turn yellow-brown or dark brown. The spots are often connected into irregular shapes and dry up in the later stages. The disease invades through wounds and is prone to occur in poor ventilation, high temperature and high humidity.

Solution: Improve ventilation and spray 800~1000 times diluted thiophanate-methyl or carbendazim for treatment.