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Influence of Glomus fasciculatus on Thielaviopsis basicola Root Rot of Citrus. R. M. Davis, Assistant Professor, Texas A&I University Citrus Center, Weslaco 78596. Plant Dis. 64:839-840. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-839.

Sweet orange seedlings were inoculated with Glomus fasciculatus alone, Thielaviopsis basicola alone, both fungi, or neither fungus. Seedlings infected with the vesicular-arbuscular mycorrhizal fungus, G. fasciculatus, were larger than nonmycorrhizal seedlings. Growth of both mycorrhizal and nonmycorrhizal seedlings was reduced by T. basicola, but mycorrhizal seedlings were larger than nonmycorrhizal seedlings. However, the relative reduction of growth by T. basicola was about 37% for both mycorrhizal and nonmycorrhizal seedlings. G. fasciculatus apparently had little influence on the root disease caused by T. basicola.

Keyword(s): endomycorrhizae, soil fungi.