Fusarium solani f. robiniae n. f., one of the causal fusaria of the twig blight of Robinia pseudoacacia

Abstract

This paper deals with Fusarium solani f. robiniae n. f. [Hypomyces solani f. robiniae n. f.], one of the causal fusaria of the twig blight of Robinia pseudoacacia. This fungus was hermaphroditic and compatibility-heterothallic, and was independent from forms of F. solani in the mating relationship. However, the fertilization occurred between this fungus and F. solani derived from the decaying bark of Populus spp. suggesting that these two fungi are identical. According to the results of cross-inoculations between this fungus and various forms of Fusarium solani, this fungus was pathogenic to its own host, the twig of Robinia pseudoacacia, but not pathogenic to the squash seedling, the bean seedling, the pea seedling, the potato stem, the Morus twig and the Xanthoxylum twig, though mildly pathogenic to the potato tuber and the sweet potato sprout. On the other hand all the other forms of F. solani tested were not pathogenic to Robinia pseudoacacia. From these results the authors proposed a new form for this fungus as follows.Fusarium solani Mart. emend. Snyd. et Hans. f. robiniae Matuo et Sakurai n. f. [Hypomyces solani Rke. et Berth. emend. Snyd. et Hans. f. robiniae Matuo et Sakural n. f.] Hab. in vivis Robiniae pseudoacaciae, cetera ut in typo9).The type culture is deposited in Lab. Phytopath. & Mycol., Fac. Text. Sci., Shinshu Univ., Ueda, Japan, which was isolated from the twig of Robinia pseudoacacia suffered from blight disease.