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Does chemical control of blind seed disease (Gloeotinia temulenta) affect endophyte transmission in ryegrass seed crops?

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Abstract

Seven fungicides were evaluated in two separate field trials for their control of blind seed disease and effect on endophyte transmission in perennial ryegrass. Six fungicides were assessed with cultivar One50 for their effects on transmission of the endophyte strain AR37. Five fungicides were labelled for the control of blind seed disease (Gloeotinia temulenta), stem rust (Puccinia graminis) and/or crown rust (P. coronata). In the first trial no attempt was made to induce blind seed disease. The second trial induced disease in the perennial ryegrass cultivars Horizon and Grasslands Samson. The effect of six fungicides on the control of blind seed and transmission frequency of AR37 was determined. In trial one, germination was high (88–93%) and the incidence of blind seed disease low (2–8%) across all treatments. There was no effect of fungicide treatment on germination nor did fungicide treatment affect endophyte transmission. However in trial two, disease incidence reached 63 and 76%, in Samson and Horizon, respectively. The majority of fungicide treatments were effective in reducing blind seed disease but this varied with fungicide type and timing of application. No reduction in endophyte transmission frequency was observed in Samson as a result of fungicide application. A low endophyte transmission frequency was observed with Horizon and therefore no conclusions around fungicide application on the vertical endophyte transmission of AR37 within this particular cultivar could be made. Possible reasons for differences in the effectiveness in control of blind seed disease achieved with the fungicides used and timing of application are discussed. These two trials demonstrate that fungicides can be used to control blind seed in ryegrass without a detrimental effect on AR37 endophyte content in seed produced.

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Acknowledgements

The authors gratefully acknowledge the financial support received by Eduardo Sandoval Cruz from the TR Ellett Agricultural Research Trust, the Foundation for Arable Research (FAR), Seed Tech Services (Massey University) and the John Hodgson Pastoral Science Scholarship to undertake this research. The authors also thank Kay Sinclair (Massey University) for advice on seed germination assessments and Nik Grbavac (AsureQuality Limited) for advice on blind seed assessments.

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Correspondence to C. R. McGill.

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Sandoval Cruz, E.A., McGill, C.R., Southward, R.C. et al. Does chemical control of blind seed disease (Gloeotinia temulenta) affect endophyte transmission in ryegrass seed crops?. Australasian Plant Pathol. 47, 561–569 (2018). https://doi.org/10.1007/s13313-018-0598-0

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  • DOI: https://doi.org/10.1007/s13313-018-0598-0

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