![]() Annual Report of the Society of Plant Protection of North Japan 31: 95-97. ![]() Control of witches' broom on cherry trees caused by Taphrina wiesneri by pruning of the diseased twigs and fungicidal application. Rex Lime Sulfur Solution (28%) at 6 to 12 gal/100 gal water. Foliar spray, basal bark treatment, and cutting stems and painting the fresh cut with herbicide can provide effective control.Trace the main stem of the "broom" to where it grows from the normal branch, then cut the branch at least 12 inches below that point.Ĭhemical control Make an application at delayed dormant growth stage. Affected leaves somewhat resemble peach leaves affected by peach leaf curl-thick, reddish, with a white growth of fungus (asci) on the undersurface. Long, slender branches grow from this stem. At the base of the witches' broom is a common stem, which may be much thicker than the branch to which it is attached. They are easily distinguished at blossom time: they have few flowers and become leafy earlier than normal branches. Symptoms Large, broom-like tufts develop on branches. In Oregon, the disease is only on sweet cherry trees. Treatment of Lime Witches Broom Phytoplasma-Infected Mexican Lime with a Resistance Inducer and Study of its Effect on Systemic Resistance. Once a branch is infected, it will always remain so, and the leaves on the "broom" will be diseased every year. Ascospores from diseased leaves fall on buds and, upon germinating, penetrate the branch, stimulating it to abnormal growth year after year. flavorubra on Western Sand Cherry, fungi.
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