Performance of Wheat Variety Blends in Kansas (2001)

Bowden, Robert L.; Shroyer, J. P.; Roozeboom, Kraig L.; Claassen, Mark M.; Evans, Patrick M.; Gordon, Bryan C.; Heer, B.; Janssen, K. A.; Long, James H.; Martin, J. Holmes; Schlegel, Alan J.; Sears, R. G.; Witt, M. D.

doi:10.4148/2378-5977.7327

Cited by 30 publications

(42 citation statements)

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“…Mixing different genotypes also may be effective for the deployment and sustainability of major resistance genes, especially those vulnerable to "boom-and-bust" cycles (e.g., leaf rust) (28). Mixtures generally have been correlated with increased yield stability (4,33,35,40) and, in fact, growers often are more interested in yield stability than in small yield increases associated with mixtures (32).…”

Section: Discussionmentioning

confidence: 99%

“…Jagger lacks strong winter hardiness. Mixing Jagger with a lower-yielding but more winter-hardy cultivar reduces the risk of crop failure and increases yield stability over time (4). The cultivars used in this study, Jagger and 2145, which have differential resistance levels to tan spot and leaf rust, potentially could be useful in mixture for reducing disease in the Great Plains.…”

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confidence: 99%

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Cultivar Mixtures for the Simultaneous Management of Multiple Diseases: Tan Spot and Leaf Rust of Wheat

Cox¹,

Garrett²,

Bowden³

et al. 2004

Phytopathology®

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Because of differences in life histories between Puccinia triticina, a highly specialized, polycyclic, windborne pathogen with a shallow dispersal gradient, and Pyrenophora tritici-repentis, a residue-borne pathogen with a steep dispersal gradient, wheat mixtures are expected to be more effective at controlling leaf rust than tan spot. The objectives of this research were to determine the effect of two-cultivar mixtures with varying proportions and different pathogen resistance profiles on the severity of tan spot and leaf rust, to evaluate yield of the mixtures in the presence or absence of disease, and to directly compare the relative effectiveness of cultivar mixing for tan spot versus leaf rust. In a field experiment at two sites in Kansas over two growing seasons, winter wheat cvs. Jagger and 2145, which have differential resistance reactions to leaf rust and tan spot, each were planted in proportions of 0.25, 0.50, 0.75, and 1.00. Plots were inoculated with each pathogen alone, both pathogens, treated with a fungicide, or exposed to ambient conditions. For both diseases for all siteyears, severity decreased substantially on the susceptible cultivar as the proportion of that cultivar decreased in mixture. Mixtures were significantly more effective at reducing leaf rust than tan spot in three of four site-years. Mixtures generally yielded the same as the weighted mean of components in monoculture although, in two of three site-years, at least one fungicide-treated and one diseased mixture each yielded higher than expected values. Although this particular mixture produced only modest yield benefits, the potential for simultaneous reductions in tan spot and leaf rust was demonstrated.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Cultivar Mixtures for the Simultaneous Management of Multiple Diseases: Tan Spot and Leaf Rust of Wheat

Cox¹,

Garrett²,

Bowden³

et al. 2004

Phytopathology®

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show abstract

“…The blends are typically made from equal proportions of three cultivars (Bowden et al, 2001). Garrett and Cox (2008) stated, ''Mixtures of at least two crop cultivars increases the genetic diversity and has been shown to be effective at reducing disease and pest severity, increasing yield stability, and strengthening resilience of the crop to physiological stress.''…”

Section: Literature Reviewmentioning

confidence: 99%

“…In recent years, wheat producers have mixed the seeds of several pure varieties together into a ''blend'' of seeds, in the attempt to stabilize yields (Bowden et al, 2001). Blends were not planted at all in Kansas in 1997, but the percentage of acres planted to wheat blends increased steadily to reach a peak of 15.2% in 2004.…”

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Wheat Variety Selection to Maximize Returns and Minimize Risk: An Application of Portfolio Theory

Barkley

Peterson

Shroyer

2010

J. agric. appl. econ.

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This research shows that a portfolio of wheat varieties could enhance profitability and reduce risk over the selection of a single variety for Kansas wheat producers. Many Kansas wheat farmers select varieties solely based on published average yields. This study uses portfolio theory from business investment analysis to find the optimal, yield-maximizing and riskminimizing combination of wheat varieties in Kansas.

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“…Practices such as deployment of crops in mixtures, intercrops, or polycultures may be an important component in perennial grain agriculture (4,7,8,17,18,30,46). But whether perennials are mixed within polycultures or uniform in monocultures, resistance to a set of locally important cereal diseases will be an essential managerial component (3,7).…”

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Reactions of Perennial Grain Accessions to Four Major Cereal Pathogens of the Great Plains

et al. 2005

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Methods of disease management used in annual grain crops, especially cultural practices designed to disrupt the disease cycle of a particular pathogen, will not necessarily be applicable to perennial grain crops. Resistance to multiple pathogens, therefore, will clearly be important in disease management. The objective of this research was to evaluate disease resistance in 10 perennial grain accessions (one to two accessions of each: perennial wheat (Thinopyrum sp. × Triticum aestivum), intermediate wheatgrass (Thinopyrum intermedium), perennial rye (Secale montanum), hexaploid triticale (Triticum turgidum × S. montanum), octoploid triticale (Triticum aestivum × S. montanum), tetraploid perennial rye (Secale cereale × S. montanum), and tall wheat-grass (Thinopyrum ponticum)) to tan spot (caused by Pyrenophora tritici-repentis), take-all (caused by Gaeumannomyces graminis var. tritici), wheat streak mosaic, and barley yellow dwarf, four important diseases of the Great Plains. Several of the grasses were resistant to tan spot, barley yellow dwarf, and wheat streak mosaic. Indeed, the wild grasses and perennial donors T. intermedium (including BFPMC1), T. ponticum, and S. montanum, in addition to Permontra, a tetraploid perennial rye, were highly resistant to all three diseases. Additionally, the remaining grasses tested were also more resistant to tan spot than the susceptible wheat control. However, none of the 10 grass accessions appeared highly resistant to take-all, and substantial losses in biomass were observed, although such effects may be moderated under field conditions due to the potential for take-all decline in perennial plantings.

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Performance of Wheat Variety Blends in Kansas (2001)

Cited by 30 publications

References 0 publications

Cultivar Mixtures for the Simultaneous Management of Multiple Diseases: Tan Spot and Leaf Rust of Wheat

Cultivar Mixtures for the Simultaneous Management of Multiple Diseases: Tan Spot and Leaf Rust of Wheat

Wheat Variety Selection to Maximize Returns and Minimize Risk: An Application of Portfolio Theory

Reactions of Perennial Grain Accessions to Four Major Cereal Pathogens of the Great Plains

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