This study was conducted to investigate the effect of mineral and starch contents of the trees on the rough bark disorder in the dwarf apple trees. The symptom of the disorder may- be similar to that of apple measles induced by manganese toxicity or boron deficiency. But this symptom develops on the stem bark, whereas Mn toxicity and B deficiency occur from one and two year-old twigs. The obtained results were summarized as follows:
1. Mineral contents such as Mg, Ca, bLn, Fe, B, Zn and Cu in the leaf, shoot and trunk bark showed little difference between the rough-bark and a normal tree.
2. Ca content in root of disordered `Fuji´ tree was significantly lower than that of normal trees.
3. Contents of Mg, Mn, Fe, B and Zn with the exception of Ca in the outer bark of trunk were higher than those in the inner bark in a normal tree. Those minerals with the exception of Mn were significantly lower in the inner bark of the disordered tree, particularly Zn content was highly significantly lower as compared with that in the inner bark of a normal tree.
4. Starch and glucose contents in the stem bark and roots of the disordered tree were lower than in the normal tree throughout the year, However, `Fuji´ showed higher starch concentration than `Tsugaru´.
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