How to grow tree peonies? Understanding tree peony gray mold in one article
What is tree peony gray mold? What harm does gray mold do to tree peonies? We ask friends to help explain the harm of tree peony gray mold: Tree peonies are affected by gray mold throughout their entire growth period, with the most occurrences from June to July each year. When seedling stems and bases are affected, they show dark green, water-soaked, irregular-shaped lesions that gradually turn brown...
What is tree peony gray mold? What harm does gray mold do to tree peonies? We ask friends to help explainHarm of tree peony gray mold:
Tree peonies are affected by gray mold throughout their entire growth period, with the most occurrences from June to July each year. When seedling stems and bases are affected, they show dark green, water-soaked, irregular-shaped lesions, gradually becoming brown, sunken and rotting, causing lodging, and blackish-brown mold grows on the diseased parts.
After flower buds are infected, the petals wither and the floral organs turn brown and rot. When leaves and petioles are infected, the lesions are round with irregular concentric rings, and in humid weather mold grows on the lesions.
Control methods for tree peony gray mold:
In autumn, collect and burn the dead branches and fallen leaves of tree peonies; they must not be used for compost. If dead leaves or dead buds are found on tree peonies, remove them immediately and burn them.
Deeply plow the soil in affected areas, and avoid planting too densely; it is best to practice 2-3 year crop rotation.
Select disease-free tree peony seed buds, improve soil drainage conditions, and do not apply excessive chemical fertilizer.
In spring, when the young buds of plants in affected areas first open, use chemicals for protection: 1:1:100 equal-strength Bordeaux mixture; or 65% zineb wettable powder 500 times dilution; or 70% mancozeb wettable powder 500-600 times dilution spray, once every 7-10 days, for 2-3 consecutive applications.
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