Factors affecting Occurrence of the Ophiobolus Patch Disease of Turf and its Control by Phialophora radicicola

摘要: SUMMARY Phialophora radicicola is present in large amounts most grasslands Britain and probably restricts the occurrence of Gaeumannomyces graminis var. avenae, cause ophiobolus patch disease. Its absence from turf low pH (< c. 4-5) could explain why such often develops disease after liming. High water content also associated with disease, but does not seem to affect P. radicicola; therefore, it possibly prevents grassses forming new roots replace diseased ones. Grasses show a wide range tissue resistance G. which explains their reaction field: all species tested were apparently more resistant than wheat oats, so this might contribute success controlling take-all fungus on grasses. By implicating its control, many aspects are explained, for example, geographical distribution development relation management. Provisional recommendations avoiding made. These include manipulation pH, inoculation restricted use broad-spectrum fungicides soil fumigants as destroy resident population radicicola.