Identifying Plant Disease Japanese Holly

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How to Identify Plant Diseases on a Japanese Holly. Examine the leaves of the shrub and look for small, yellow spots that have brown centers and purple borders. Examine the leaves for signs of brown or tan spots, which is an indication that the plant has contracted Anthracnose..Black root rot disease is a fungal infection that affects Japanese holly plants. Caused by the fungal pathogen Thielaviopsis basicola, black root rot is a soilborne .Watch Japanese holly for yellowing of the leaves followed by slow plant growth, early leaf drop and twigback. If you notice these symptoms together, your Japanese holly may have black root rot. Examine the Japanese holly 's feeder roots, which are normally small, soft and white, for signs of black bands or rings.. - Diseases. Damaged Japanese holly Ilex crenata roots infected with black root rot. Division of Plant Industry Archive, Florida Department of .

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