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Web URL(s):https://archive.lib.msu.edu/tic/its/articles/1977sup18.pdf
    Last checked: 03/17/2016
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Publication Type:
Content Type:Abstract or summary only
Author(s):Vargas, J. M.
Author Affiliation:Associate Editor, Editorial Board for the Proceedings, International Turfgrass Society Program: III International Turfgrass Research Conference Dept. of Botany and Plant Pathology, Michigan State University, Michigan
Title:The principles of breeding and blending Kentucky bluegrass cultivars for disease resistance
Section:Session 1
Other records with the "Session 1" Section
Meeting Info.:Munich, Germany: July 11-13, 1977
Source:International Turfgrass Society Program: III International Turfgrass Research Conference. 1977, p. 18.
# of Pages:1
Publishing Information:Munich, Germany: [International Turfgrass Society]
Keywords:TIC Keywords: Blends; Breeding aims; Breeding program; Cultivar improvement; Disease resistance; Drechslera poae; Poa pratensis; Polystand
Abstract/Contents:"The first criteria for selecting a Kentucky bluegrass cultivar must be its' environmental adaptability to the area or location. The second criteria, and no less important, is its' disease susceptibility. Agronomic characteristics such as color, density, establishment rate or economic consideration such as seed cost and availability should not be a primary consideration in selecting a cultivar for a blend. They should be only secondary considerations in selecting a cultivar for a blend from a list of environmentally adaptable and disease resistant cultivars. There are two types of resistance to diseases in plants; vertical resistance (specific resistance) and horizontal resistance (generalized resistance). Resistance in Kentucky bluegrass (Poa pratensis L.) to Helminthosporium vagans Drechsl. has been the classic example of successful breeding and selecting programs using horizontal resistance. However, because of a lack of understanding of the principles involved in horizontal resistance to H. vagans in Kentucky bluegrass cultivars improper blends are often recommended or used. More specifically Helminthosporium resistant cultivars are blended with Helminthosporium susceptible cultivars and they should not be. Our data show blending a Helminthosporium resistant cultivar with a Helminthosporium susceptible cultivar reduces the strength of the blend. Others data have shown similar results but the results often have been misinterpreted. For example, it is explained that blending a cultivar like "Prato" which is often thinned to a 30 % stand with a resistant cultivar like Merion results in a 60 to 70 % stand, thus showing the strength of the blending and Helminthosporium resistant cultivar with a susceptible cultivar. What was overlooked was the fact that Merion by itself had a 90 % or better stand. The principle of Merion Kentucky bluegrass resistance to H. vagans is inoculum reduction and by continuing to subject it to high levels of inoculum by blending it with a susceptible cultivar the benefit of horizontal resistance is negated."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Vargas, J. M. 1977. The principles of breeding and blending Kentucky bluegrass cultivars for disease resistance. Int. Turfgrass Soc. Annexe - Tech. Pap. p. 18.
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    Last checked: 03/17/2016
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