Potential biological control of take-all disease in perennial ryegrass
Perennial ryegrass (Lolium perenne) is the major pasture grass in New Zealand but is highly susceptible to take-all disease, caused by the root-rot pathogen Gaeumannomyces graminis (Gg). Isolates of the fungus Trichoderma atroviride are known to control Gg but it is not known if a mixture of isolates would be more effective than individual ones. Soil from a field naturally infested with Gg was placed in containers in a glasshouse and sown with ryegrass seeds then treated with one of three Trichoderma atroviride isolates or a mixture of all three isolates. All T. atroviride treatments significantly increased shoot dry matter by 46–73% and root dry matter by 42–62% compared with the control but a mixture of isolates was no more effective than individual isolates. Application of T. atroviride also significantly decreased root disease severity, which was negatively correlated with root dry matter. Take-all in pastures could possibly be controlled by overdrilling grass with a single isolate of T. atroviride.... [Show full abstract]
Fields of Research0703 Crop and Pasture Production; 070308 Crop and Pasture Protection (Pests, Diseases and Weeds); 0503 Soil Sciences; 100202 Biological Control
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