Abstract
The causal fungus of trunk-blight of Xanthoxylum piperitum (L.) DC., which was named Nectria elegans by Yamamoto and Maeda, was identified by the writers as Hypomyces solani (Rke. et Berth.) Snyd. et Hans. [Fusarium solani (Mart.) Snyd. et Hans.].
Cross inoculations were carried out between this fungus and 7 forms and 2 races of Fusarium solani. This fungus was pathogenic only to Xanthoxylum piperitum and not to any host of the other forms of F. solani. On the other hand all the forms and races of F. solani tested were non pathogenic to Xanthoxylum piperitum. From these results, the writers propose the following nane for this fungus.
Hypomyces solani (Rke. et Berth.) Snyd. et Hans. f. xanthoxyli Sakurai et Matuo nom. nov.
[Fusarium solani (Mart.) Snyd. et Hans. F. xanthoxyli Sakurai et Matuo nom. nov.]
Syn. Nectria elegans Yamamoto et Maeda
Hab. in vivis xanthoxyli, cetra ut in typo10)
The type culture is deposited in Lab. Phytopath. & Mycol., Fac. Text. Seric., Shinshu Univ., Ueda, Japan, which was isolated from Xanthoxylum piperitum suffered from blight disease.
The sexuality of this fungus was studied. The results of reciprocal spermatization among the monoascosporic strains proved that this fungus is hermaphroditic and shows the compatibility heterothallism. Interformic fertility between this fungus and f. cucurbitae, f. mori and f. radicicola race 2 of Hypomyces solani was tested. But the interformic cross did not occur in every occasion.
