7/11/2023 0 Comments Fire blight treatment![]() ![]() Scab-resistant crabapples: Adams, Baskatong, Brandywine, Callaway, David, Dolgo, Donald Wyman, Malus floribunda, Henry Kohankie, Henningi, Jewelberry, Ormiston Roy, Professor Sprenger, Malus seiboldi var. Apply a fungicide as flower buds begin to show color (early pink) and again 3 weeks later. ![]() Rake and destroy fallen leaves and fruit. Grow resistant cultivars (see list below). Infected fruit have circular, rough spots on their surface. Leaves yellow and fall prematurely, giving the tree a thin, bare appearance by mid-season. Remove nearby unwanted plants that are susceptible to fire blight.įire blight-resistant crabapples: Adams, Callaway, David, Dolgo, Harvest Gold, Indian Summer, Jewelberry, Liset, Profusion, Red Baron, Selkirk, and Sentinel.ĭull, olive-green, velvety fungal growth develops on the surface of leaves and petioles in the spring. Remove root suckers and water sprouts while they are small. Fertilize carefully to avoid promoting excessive succulent growth. Branches will be killed as slightly sunken cankers enlarge into larger branches and even into the main trunk.ĭuring dormancy when the weather is dry, prune infected branches, cutting at least 4 inches below the base of the canker. Cankers formed the previous season may ooze a cloudy liquid during wet spring weather. Dead leaves may remain attached to the tree. The ends of twigs and branches become brown or black and may curl into a shepherd's crook shape. Infected flowers are killed and often remain attached throughout the season. Therefore, irrigate to prevent drought stress. Trees most susceptible are those under drought stress. Branches die back and become covered with dark-brown to black, pimple-like fungal fruiting structures. Leaves on affected branches wilt and die.
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