Effects of nitrogen fertilization and cultivar on the damage relation of powdery mildew (Erysiphe graminis) in winter wheat

Daamen, R. A.

doi:10.1007/bf01998397

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…Measurements of disease or healthy leaf area duration can be used to estimate crop damage, and empirical damage functions in several crops often indicate a negative linear relationship between powdery mildew intensity and yield (e.g. Daamen, ; Lipps & Madden, ). Crop damage is more difficult to predict for commodities used directly by buyers and evaluated by cosmetic appearance such as fruits and fresh market vegetables (Jarvis et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Crop damage caused by powdery mildew on hop and its relationship to late season management

et al. 2013

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Powdery mildew of hop (Podosphaera macularis) may cause economic loss due to reductions in cone yield and quality. Quantitative estimates of crop damage from powdery mildew remain poorly characterized, especially the effect of late season disease management on crop yield and quality. Field studies in Washington State evaluated cone yield, bittering acid content and quality factors when fungicide applications were ceased at different stages of cone development. The incidence of cones with powdery mildew was linearly correlated with yield of cones, bittering acids and accelerated cone maturation. In cultivar Galena, the cumulative effect of every 1% increase in cones powdery mildew incidence was to reduce alpha-acid yield by 0Á33%, which was due to direct effects on cone yield but also indirect effects mediated by dry matter. In the more susceptible cultivar Zeus, alpha-acid yield was increased 20% by controlling powdery mildew through the transition of bloom to early cone development compared to ceasing fungicide applications at bloom: additional applications provided only modest improvements in alpha-acid yield. In both cultivars, the impact of powdery mildew on aroma characteristics and bittering acid content were less substantial than cone yield. The damage caused by powdery mildew to cone colour and alpha-acid yield, as well as the effectiveness of fungicide applications made to manage the disease, appears inseparably linked to dry matter content of cones at harvest. Realising achievable yield potential in these cultivars requires control of the disease through early stages of cone development and harvest before maturity exceeds c. 25% dry matter.

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Section: Introductionmentioning

confidence: 99%

Crop damage caused by powdery mildew on hop and its relationship to late season management

et al. 2013

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“…Such differences in tolerance towards a disease modify disease/yield relations and can hardly be integrated in a simple mathematical model. Disease/yield loss relationships presented in literature are based on a strong correlation of grain yield and assimilating leaf area (Madden, 1983;Daamen, 1988). However, it is impossible to take the rather complex process of yield formation into consideration when modelling the data to obtain reasonably accurate disease-severity/yield-loss predictions.…”

Section: Discussionmentioning

confidence: 99%

Effects of Induced Resistance on Disease Severity/Yield Relations in Mildewed Barley

Kehlenbeck

Schönbeck

1995

Journal of Phytopathology

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Field experiments showed that the treatment of winter barley with microbia! metabolites produced by a Bacillus subtilis strain led to increased yields in spite of a remaining mildew infection. Disease severity yield relations obtained on a single tiller basis for either mildew infection at EC 75 or area under disease progress curve (AUDPC) were negatively correlated for untreated plants (R-= 89%, 94%) while this relation did not exist for inducer-treated ones {R'= 10%, 13%). Despite an increasing infection density, yields of main tillers of inducertreated plants were not decreased. On the other hand area under green leaf area curve (AUGLAC) showed a higher correlation with grain yield {R' = 89%) of inducer-treated plants. Possible explanations for the mitigated damaging efiect of powdery mildew were expected in carbohydrate metabolism, especially carbohydrate formation and translocation. Assimilation rates of flag leaves of inducer-treated barley with similar infection densities to those of untreated plants were increased over a prolonged period and even exceeded those of noninfected ones. In inducer-treated plants the export of "CO; from fiag leaves into ears remained unimpaired by mildew infection and the allocation of assimilates to grains was highest at late stages of grain filling. Obviously plants were stimulated by inducer treatments to compensate for the damaging effect of powdery mildew and to tolerate mildew infection without yield loss. Zusannnenfassuag EinfluBinduzierter Resistenz auf die Befalls-Verlust-Relationen Mehltaubefallener WintergersteIn Freilandversuchen fUhrte die Behandlung von Wintergerste mit mikrobiellen StofTwechselprodukten eines Bacillus ju&»Yw-Stammes trotz eines verbleibenden Restbefalls mit Echtem Mehltau zu Ertragssteigerungen gegeniiber befallsfreien Pflanren. Auf der Basis von Einzelhalm-Untersuchungen zeigte unbehandelte Wintergerste eine negative Korrelaticn zwischen Befall und Ertrag sowohl far den durchschnittlichen Mehltaubefall der oberen beiden Blatter zum EC 75 (R^ = 89%) als auch fflr die Flache unter der Befallskurve (AUDPC, R' = 94%), wahrend eine solche Beziehung fur induriert resistente Pfianzen nicht erkennbar war (R' = 10% bzw. 13%). Trotz steigender Mehltauinfektion war die Ertragsleistung von Haupthalmen induziert resistenter Pflanzen nicht beeintrachtigt. F(lr die Flache unter der Kurve der grttnen Blattflache (AUGLAC) konnte hingegen eine gute Korrelation mit dem Ertrag indtiziert resistenter Pflanzen festegestellt werden. Brklarungsmoglichkeiten fUr die verminderte Ertragswirksamkeit des Echten Mehltaus wurden in einer veranderten Kohlenhydratbildung und-translokation vermutet. Bei etwa gleichem Befall wiesen die Fah-nenbiatter induziert resistenter Gerste gegenuber unbehandelten FHanzen Uber einen langeren Zeitraum hohere COj-Assimilationsraten auf, die auch die der befallsfreien Pflanzen Oberstiegen. Die Verlagerung von '''CO, aus den Fahnenblattem in die Ahren war in induktorbehandelten Pflanzen durch den Mehltaubefall nicht beeintracbtigt und die Einlag...

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“…The averaged measured damage function of powdery mildew in winter wheat (Daamen, 1988 and1989) was implemented in a management system to assess the profitability of fungicide application in farmers' fields in the Netherlands. Though damage was measured under conditions approaching those of farmers' fields, it is uncertain to what extent this damage function may be extrapolated to other weather conditions (Jenkyn, 1984), in different years or locations, and to crop husbandry practices other than those of the experiments.…”

Section: Intl'oductionmentioning

confidence: 99%

Effects of powdery mildew and weather on winter wheat yield. 1. Variation of weather between years

Daamen¹,

Jorritsma

1990

Netherlands Journal of Plant Pathology

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A vital question to upgrade disease management systems is whether damage functions, established in years with specific weather conditions, can be applied also in other years. A simulation approach was used to explore effects of weather on yield and damage. Two existing models of wheat and a third, a combination of both, were used to compute yield, first in absence of mildew. In a second paper, effects of mildew will be reported. Yields simulated for different years were not significantly correlated with yields harvested, adjusted for their increase over years, in the Netherlands. Differences in performance between the models could be attributed to the method of simulating development and growth early in the cropping season.

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Effects of nitrogen fertilization and cultivar on the damage relation of powdery mildew (Erysiphe graminis) in winter wheat

Cited by 10 publications

References 12 publications

Crop damage caused by powdery mildew on hop and its relationship to late season management

Crop damage caused by powdery mildew on hop and its relationship to late season management

Effects of Induced Resistance on Disease Severity/Yield Relations in Mildewed Barley

Effects of powdery mildew and weather on winter wheat yield. 1. Variation of weather between years

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