![]() ![]() The rain and wind then carry the black knot fungus spores to susceptible plants. Infected branches may wilt, not grow leaves, and can eventually kill the entire tree.Ĭauses: Through spring and summer, mature knots produce spores. Diseased twigs often bend due to knot overgrowth. ![]() Velvety, olive-green fungal growth may cover the knots. These knots appear in various areas around the tree and enlarge when the disease is left untreated. Symptoms: Black knot ( Dibotryon morbosum) appears as hard, black swellings or knots, which may stretch 1-6 inches on the tree. Black knot-resistant cherry tree varieties include East Asian cherry, North Japanese hill cherry, and Prunus maackii (Manchurian cherry or Amur chokecherry). ![]() Photo Credit: Scot Nelson / Flickr / CC0 1.0Ĭherry Trees Affected: Common among most Prunus varieties, including ornamental, edible, and native types. ![]()
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