Abstract
This paper is written the experimental results on the cultural characteristics of the violet and white root fungi, Helicobasidium Mompa TANAKA and Rosellinia necatrix (HARTIG) BERLESE, on apple trees.1. The growth of Helicobasidium Mompa is very slower than that of Rosellinia necatrix, especially in the growth of the aerial and superficial hyphae. However, it is conjectured that the submerged mycelia of Helicobasidium Mompa is able to develop deeper and more luxuriant than that of Rosellinia necatrix in the nutritional media. The dry weight of mycelial felts may explain a part of its reason.2. In both Helicobasidium Mompa and Rosellinia necatrix, the development of its mycelia in the dark is more vigorous than in the daylight and its difference between them seems to be more remarkable in the mycelia of Rosellinia necatrix.3. The dry weight of mycelial felts of Rosellinia necatrix cultured in six weeks becomes lighter than that of culturd in four weeks. This supposed to be the result of autolysis of the fungus.
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