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KMID : 0903519640050010043
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1964 Volume.5 No. 1 p.43 ~ p.47
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Studies on The Nutrition of Apple Trees with Reference to The Bark Necrosis Disease
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Abstract
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Leaf analysis was used as a means of diagnosis of unknown apple bark disease. The results obtained from analysis may be summarized as follow;
Manganese is one of the most important element in the development of the bark disease. Evidence supporting this view was presented in 1962 by writers, Diseased symtom appears about 904 ppm of manganese and on average, manganese content of diseased leaves was 4 times as high as that of healty leaves. There is a significance between the reducible manganese in soil and the absorption of manganese in diseased leaves.
Consequently, the disease should be considered manganese toxicity and may be the same one described by Berg as $quot;Internal Bark Necrosis.$quot; In order to prevent the bark disease, plant absorption of manganese must be decreased with increasing soil pH, or by other means.
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