Effects of nitrogen fertilization and cultivar on the damage relation of powdery mildew (Erysiphe graminis) in winter wheat |
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Authors: | R A Daamen |
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Institution: | (1) Research Institute for Plant Protection (IPO), P.O. Box 9060, 6700 GW Wageningen, the Netherlands |
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Abstract: | The damage relation of powdery mildew in winter wheat was studied in field experiments in 1981 and 1983, in the Netherlands. No firm conclusion was obtained on the effect of nitrogen supply (175 and 235 kg ha–1 N totally) on the damage relation. The relation was not affected by cultivars (four) and did not differ significantly between both years. The measured relation averaged 0.0125 kg are–1 damage per pustule-day mildew per leaf, at yields of 70–90 kg are–1. The effect of the fungicide triadimefon on yield could be ascribed to its effect on diseases. The vertical distribution of mildew in the crop was described.Samenvatting In 1981 en 1983 werd in veldproeven met wintertarwe de relatie tussen schade (in kg are–1) en meeldauw onderzocht. Of de relatie onafhankelijk is van de stikstofbemesting (175 en 235 kg ha–1 N totaal), kon niet met zekerheid worden vastgesteld. De schaderelatie werd niet significant beïnvloed door de vier getoetste rassen. In de twee jaren werd een vergelijkbare schade van gemiddeld 0.0125 kg are–1 per puistdag meeldauw per blad gemeten, bij een opbrengstniveau van 70–90 kg are–1. Tevens werd de locatie van meeldauw in het gewas beschreven. |
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Keywords: | Triticum aestivum epidemiology vertical distribution AUDPC-value tolerance integrated control Mycosphaerella graminicola triadimefon |
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