1) F. Kodama, Y. Sugawara and T. Yokoyama, Ann. Phytopath. Soc. Jpn., 42, 320 (1976).
2) M. Nishio and S. Kusano, Soil Sci. Plant Nutr., 19, 205 (1973); 21, 161, 391 (1975); 22, 277, 467 (1976).
3) S. Washio, Ann. Phytopath. Soc. Jpn., 44, 371 (1978).
4) W. M. Hess and D. J. Weber, “Phytotoxins in Plant Disease,” ed, by R. K. S. Wood, A. Ballio and A. Graniti, Academic Press, London, 1972, p. 475-478.
5) R. M. Silverstein, G. C. Bassler and T. C. Morrill, “Spectrometric Identification of Organic Compounds,” 3rd ed., John Wiley and Sons, New York, 1974, p. 219.