Abstract
Wheat yield losses caused by powdery mildew were computed based on effects of the disease on leaf photosynthesis. Powdery mildew was introduced in a crop model of wheat by quantification of five parameters, taking the vertical and horizontal distribution of mildew in the crop into account. The most important parameters were those of the mildew intensity, the distribution of mildew in the crop, and the effect of mildew on assimilation at light saturation. Measured mildew epidemics in field experiments in three different years, were used to compute yield losses. Computed losses were compared to measured losses. On average, computed yield loss approached measured, but measured yield loss was underestimated, especially in early mildew epidemics due to the computation of partitioning and reallocation of assimilates. Other processes which may cause an underestimation are described. The use of crop models as a method to upgrade disease management systems is discussed.
Samenvatting
Opbrengstderving van wintertarwe werd berekend aan de hand van het effect dat meeldauw heeft op de blad-fotosynthese. Een rekenmodel voor de gewasgroei van tarwe werd uitgebreid met meeldauw. Met inachtneming van de vertikale en horizontale verdeling van meeldauw in het gewas, werd meeldauw in het model gekwantificeerd door vijf parameters. De belangrijkste parameters waren die van de meeldauwintensiteit, de verdeling van meeldauw in het gewas en het effect van meeldauw op de assimilatie bij een overvloed aan licht. Epidemieën van meeldauw, gemeten in veldproeven in drie verschillende jaren, werden gebruikt om opbrengstdervingen te berekenen. Gemiddeld kwam deze redelijk overeen met de in de veldproeven gemeten opbrengstderving. De gemeten opbrengstderving werd echter onderschat, vooral bij vroege epidemieën van meeldauw door de wijze waarop de (her)verdeling van assimilaten wordt berekend. Andere mechanismen, die een onderschatting van opbrengstderving kunnen veroorzaken worden besproken. Of deze modellen als methode gebruikt kunnen worden om systemen voor de geleide bestrijding van ziekten te verbeteren wordt bediscussieerd.
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References
Allen, P.J., 1942. Changes in the metabolism of wheat leaves induced by infection with powdery mildew. American Journal of Botany 29: 425–435.
Daamen, R.A., 1986. Measures of disease intensity in powdery mildew (Erysiphe graminis) of winter wheat. 1. Errors in estimating pustule number. Netherlands Journal of Plant Pathology 92: 197–206.
Daamen, R.A., 1988. Effects of nitrogen fertilization and cultivar on the damage relation of powdery mildew (Erysiphe graminis) in winter wheat. Netherlands Journal of Plant Pathology 94: 69–80.
Daamen, R.A., 1989. Assessment of the profile of powdery mildew and its damage function at low disease intensities in field experiments with winter wheat. Netherlands Journal of Plant Pathology 95: 85–105.
Daamen, R.A. & Jorritsma, I.T.M., 1990. Effects of powdery mildew and wather on winter wheat yield. 1. Variation of weather between years. Netherlands Journal of Plant Pathology 96: 29–34.
Edwards, H.H. & Allen, P.J., 1966. Distribution of the products of photosynthesis between powdery mildew and barley. Plant Physiology 41: 683–688.
Finney, M.E., 1979. The influence of infection byErysiphe graminis on the senescence of the first leaf of barley. Physiological Plant Pathology 14: 31–36.
Heyland, K.U., Solansky, S. & Becker, F.A., 1979. Die Assimilatspeicherung in der Sommerweizenahre unter dem Einfluss von Mehltaubefall (Erysiphe graminis) auf verschiedenen Assimilationsorganen. Zeitschrift fur Pflanzenkrankheiten und Pflanzenschutz 86: 513–532.
Hwang, B.K., Ibenthal, W.D. & Heitefuss, R., 1986.14CO2-Assimilation and metabolism of14C-assimilates in whole plants of spring barley in relation to adult-plant resistance to powdery mildew. Korean Journal of Plant Pathology 2: 22–30.
Johnson, K.B., 1987. Defoliation, disease, and growth: a reply. Phytopathology 77: 1495–1497.
Jorritsma, I.T.M., 1986. Effecten van meeldauw op de fotosynthese van wintertarwe. Doctoraal verslag. Landbouwuniversiteit Wageningen, 43 pp.
Kern, M., 1985. Phytohormongehalte und Assimilattransport in Sommergerstensorten mit unterschiedlicher Resistenz gegenuber dem echten Mehltau (Erysiphe graminis f.sp.hordei). Dissertation, Gottingen, 94 pp.
Lim, L.G. & Gaunt, R.E., 1981. Leaf area as factor in disease assessment. Journal of Agricultural Science, Cambridge 97: 481–483.
Murray, A.J.S. & Ayres, P.G., 1986. Uptake and translocation of nitrogen by mildewed barley seedlings. New Phytopathologist 104: 355–365.
Paulech, C. & Haspelová-Horvatovicová, A., 1986. Influence of the parasitic fungusErysiphe graminis upon the assimilative pigments of barley plants during the individual stages of pathogenesis. Photobiochemistry and Photobiophysics, 12: 177–180.
Rabbinge, R., Jorritsma, I.T.M. & Schans, J., 1985. Damage components of powdery mildew in winter wheat. Netherlands Journal of Plant Pathology 91: 235–247.
Rawson, H.M., Hindmarsh, J.H., Fisher, R.A. & Stockman, Y.M., 1983. Changes in leaf photosynthesis with plant ontogeny and relationships with yield per ear in wheat cultivars and 120 progeny. Australian Journal of Plant Physiology 10: 503–514.
Roermund, H.J.W. van & Spitters, C.J.T., 1990. Simulation of yield reduction by leaf rust in winter wheat, applied to the analysis of genetic variation in partial resistance. Netherlands Journal of Plant Pathology 96: 17–28.
Schans, J., 1983. Schadecomponenten van meeldauw op tarwe. Doctoraal verslag. Landbouwuniversiteit Wageningen, 75 pp.
Spitters, C.J.T., Keulen, H. van & Kraalingen, D.W.G., 1989. A simple and universal crop growth simulator: SUCROS87. In: Rabbinge, R., Ward, S.A. & Laar H.H. van (Eds), Simulation and systems management in crop protection. Simulation Monographs Pudoc, Wageningen, 147–181.
Taylor, L.R., Woiwod, I.P. & Perry, J.N., 1979. The negative binomial as a dynamic ecological model for aggregation, and the density dependence of k. Journal of Animal Ecology 48: 289–304.
Ubels, E. & Vliet, G. van der., 1979. Beoordeling van tarwe op aantasting door schimmelziekten. IPO Mededeling Nr 798, 72 pp.
Vrede, H.C. van, 1983. Schaderelaties tussen meeldauw en tarwe. Doctoraal verslag. Landbouwuniversiteit Wageningen, 34 pp.
Waggoner, P.E. & Berger, R.D., 1987. Defoliation, disease and growth. Phytopathology 77: 393–398.
Waggoner, P.E. & Rich, S., 1981. Lesion distribution, multiple infection, and the logistic increase of plant disease. Proceedings of the National Academy of Science, USA 78: 3292–3295.
Walters, D.R., 1985. Shoot:root interrelationships: the effects of obligatory biotrophic fungal pathogens. Biological Review 60: 47–79.
Walters, D.R. & Ayres, P.G., 1983. Changes in nitrogen utilization and enzyme activities associated with CO2 exchanges in healthy leaves of powdery mildew-infected barley. Physiological Plant Pathology 23: 447–459.
Walters, D.R. & Ayres, P.G., 1984. Ribulose bisphosphate carboxylase protein and enzymes of CO2 assimilation in barley infected by powdery mildew (Erysiphe graminis f.sp.hordei). Journal of Phytopathology 109: 208–218.
Walters, D.R. & Wylie, M.A., 1986. Polyamines in discrete regions of barley leaves infected with the powdery mildew fungus,Erysiphe graminis. Physiology of Plants 67: 630–633.
Zadoks, J.C., Chang, T.T. & Konzak, C.F., 1974. A decimal code for the growth stages of cereals. Bulletin Eucarpia 7: 42–52.
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Daamen, R.A., Jorritsma, I.T.M. Effects of powdery mildew and weather on winter wheat yield. 2. Effects of mildew epidemics. Netherlands Journal of Plant Pathology 96, 35–46 (1990). https://doi.org/10.1007/BF01976605
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DOI: https://doi.org/10.1007/BF01976605