Effects of Fungicides on Mycorrhizal Development of Creeping Bentgrass. L. H. Rhodes, Assistant Professor, Department of Plant Pathology, The Ohio State University and Ohio Agricultural Research and Development Center, Columbus 43210. P. O. Larsen, Associate Professor, Department of Plant Pathology, The Ohio State University and Ohio Agricultural Research and Development Center, Columbus 43210. Plant Dis. 65:145-147. Copyright 1981 American Phytopathological Society. DOI: 10.1094/PD-65-145.

Chlorothalonil, benomyl, and iprodione reduced mycorrhizal development of creeping bentgrass when applied in the spring to golf course greens or 4–8 wk after bentgrass was seeded and inoculated with Glomus fasciculatus in the greenhouse. Other fungicides significantly reducing mycorrhizal development in the greenhouse were pentachloronitrobenzene, triadimefon, anilazine, and chloroneb. Fungicides applied 16–20 wk after bentgrass was seeded did not affect mycorrhizal development in the greenhouse. Results indicate that spring application of several turf fungicides may cause reduced mycorrhizal development in bentgrass turfs.

Keyword(s): nontarget organisms, vesicular-arbuscular.