Brown rot commonly affects trees and shrubs in the genus Prunus such as peach, plum, cherry, almond, and nectarine trees.
What is Brown Rot
- The signs of brown rot include brown, rotted bloom, water-soaked, sunken lesions on twigs, and brown or grey mold on fruits.
- Consequently, the infected fruits become uneatable.
- The fungus can overwinter in the infected twigs and fruits, especially if they stay on the tree or on the ground.
- Then, spores are released during rainy periods in the spring and summer.
- When the spores land on a surface of a fruit tree that has been wet for 5 hours or longer, it infects.
Treatment and Management
- Firstly, choose resistant varieties.
- These varieties include Hardired Nectarine, Harglow Apricot, Babygold No. 5 Peach, Elberta Peach, and Glohaven Peach.
- Secondly, be sure to prune to allow for good air circulation.
- Also water the tree from below so that you don’t wet the blossoms.
- You should remove the diseased fruits and areas of infection as soon as they happen to reduce further damage. Additionally, remove fallen leaves.
- Use a sealer to close all the cuts and wounds in order to decrease the chance of infection.
- Lastly, you can use copper fungicides or sulfur powders weekly on the infected trees starting when the blossoms are just beginning to open and continuing throughout the growing season.
- It is best when there is 12 hours of dry weather after spraying.