Japanese Maple Anthracnose
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Well now the new sapling has leafed out and despite my attempts at hygiene cleaning leaf litter and applying a microbial fungicide during bud break i now see tan spots on the leaves.
Japanese maple anthracnose. Black tar like spots appearing on the leaves is a sure sign the japanese maple is infected with anthracnose. There are two types of blight. When left untreated anthracnose is fatal to japanese maple trees. Last fall i bought a ratty bloodgood japanese maple and planted it.
Anthracnose in maple trees is quite common. This fungal disease results in distorted foliage stem dieback cankers. Three types of fungi routinely present problems for japanese maple trees. This was to replace a japanese maple sapling that succumbed to tan spots the previous year.
As the disease and the season progresses the spots grow and may eventually cover the entire leaf. Anthracnose fungi overwinter within senescent leaf tissue and in infected twigs and buds. Certain varieties of japanese maple planted in wet warm climates are prone to this fungus. Japanese maple trees are susceptible to diseases such as anthracnose verticillium wilt tar spot leaf spot leaf scorch and root rot.
These fungi are botrytis fusarium and verticillium. Japanese maple tree diseases come in two main forms. On japanese maples cankers look tan or grey compared to the usual red color of healthy branches. Anthracnose and pseudomonas tip blight.
On japanese maple lesions occur along primary veins and leaf margins and appear as tan colored papery spots. Blight and fungal infections. On sugar maple lesions occur along primary veins and appear as large brown blotches.
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