VIEW ARTICLE

Replanting of Vineyards and its Relationship to Vesicular-Arbuscular Mycorrhiza. D. R. Deal, Department of Plant Pathology, Cornell University, Ithaca, New York 14850, Present address of senior author: Department of Science, Glenville State College, Glenville, West Virginia 26351; C. W. Boothroyd(2), and W. F. Mai(3). (2)(3)Department of Plant Pathology, Cornell University, Ithaca, New York 14850. Phytopathology 62:172-175. Accepted for publication 29 August 1971. DOI: 10.1094/Phyto-62-172.

Grape vesicular-arbuscular mycorrhiza is ubiquitous in New York State vineyards. Endogone sp. invades grape roots within 15 days after appearance of the roots in infested soil. The fungus eventually forms numerous arbuscules within the inner cortical cells, and the over-all appearance of the mycorrhiza is that of the Arum type. Presence of old grape roots in the soil, proximity of replant vine to location of a previous vine, and shorter time lapse between old vine removal and replanting increased frequency of occurrence and intensity of mycorrhizal development in replant vines. The addition of fertilizer to replanted soil decreased occurrence and intensity of the mycorrhiza.