Cultivar mixtures and fungicide sprays against leaf and glume blotch and brown rust in winter wheat | Associations varietales et interventions fongicides contre les septorioses et la rouille brune du ble d'hiver
2001
Mille, B. (Institut National de la Recherche Agronomique, Thiverval Grignon (France). Centre de Versailles Grignon, Unite de Pathologie Vegetale et Epidemiologie) | de Vallavieille-Pope, C.
Cultivar mixtures slow down the progression of foliar fungal diseases. Field experiments conducted over 3 years showed that chemical sprays against leaf and glume blotch and brown rust could be delayed in cultivar mixtures of winter wheat as compared to the treatment schedule in pure stands. Mixture efficiency was mainly visible in unsprayed plots. It could however also be observed when fungicide treatments were delayed by 7 to 20 days, compared to the classical treatment schedule, for mixed stands including one or two susceptible cultivars along with one cultivar resistant to the major foliar diseases. Over the 3 years, a 15 % reduction in necrotic leaf area and a 7.5 % increase in yield were observed in mixed stands as compared to pure stands without treatment. The classical fungicide program (spray applied when 50 % of the plants have necroses on one of the top three leaves) was preferable for pure stands, but a delayed fungicide program was possible and sometimes even preferable for mixed cultivars (yield supplement of 7 % with a three-cultivar mixture as compared to pure stands with the classical treatment in 1993)
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