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Effects of summer fallow management on take-all of winter wheat caused by Gaeumannomyces graminis var. tritici

Abstract : Crop rotation is the oldest, and perhaps the best cultural practice for reducing the risk of take-all. The effects of crops sown before wheat in a rotation are known in detail, but we know little about the opportunities for reducing take-all risk by planting certain crops in the summer period between wheat harvest and the planting of a subsequent winter wheat crop. We investigated the effects on take-all of five summer fallow crops, two soil tillage treatments and a fungicide seed treatment, in a five site-year experiment. We tested the effects of oats, oilseed rape, mustard, ryegrass and volunteer wheat crops. Bare-soil plots were also included. Take-all epidemics varied with year and site. Summer fallow crops had a greater effect on tilled plots. The incidence and severity of take-all were significantly higher in the wheat volunteer plots, whereas maintaining bare soil provided the lowest level of disease. Oilseed rape had no significant effect on take-all incidence in our! experiment. The best candidates for reducing take-all risk appeared to be oats, mustard and ryegrass. These summer fallow crops decreased disease levels only when associated with conventional tillage. Summer fallow crops did not alter take-all decline in the same way as a break crop after a wheat monoculture
Keywords : PIETIN-ECHAUDAGE
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Submitted on : Monday, June 1, 2020 - 1:01:10 AM
Last modification on : Friday, February 5, 2021 - 3:40:55 AM

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Sabah Ennaïfar, Philippe Lucas, Jean Marc Meynard, David Makowski. Effects of summer fallow management on take-all of winter wheat caused by Gaeumannomyces graminis var. tritici. European Journal of Plant Pathology, Springer Verlag, 2005, 112 (2), pp.167-181. ⟨10.1007/s10658-005-3121-8⟩. ⟨hal-02682420⟩

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