Hopper,
"Sources of off-types in
pedigreed seed of common spring wheat. Can. J. Plant Sci. 84: 519–523. This survey reports on the number and type of offtypes
observed in purity of variety small-scale field plots of common spring wheat. Generally, contamination levels were <0.02%,
out-crossing rates using awnedness as an indicator were <0.002%, gliadin fingerprint variants were <0.01%, and mechanical
admixtures were <0.01%. Contamination levels were rarely above acceptable impurity tolerances, indicating that the Canadian
pedigreed seed certification system, as prescribed by the Canadian Seed Growers’ Association, currently recommends operating
procedures that achieve high seed purity."
When we did our roguing on SWSW Sadash we were allowed 6 maximum off types of all wht plants (including Red Wheat) in 10,000 plant count for Certified. Foundation is 1 in 10,000 plants max impurity.
"Sources of off-types in
pedigreed seed of common spring wheat. Can. J. Plant Sci. 84: 519–523. This survey reports on the number and type of offtypes
observed in purity of variety small-scale field plots of common spring wheat. Generally, contamination levels were <0.02%,
out-crossing rates using awnedness as an indicator were <0.002%, gliadin fingerprint variants were <0.01%, and mechanical
admixtures were <0.01%. Contamination levels were rarely above acceptable impurity tolerances, indicating that the Canadian
pedigreed seed certification system, as prescribed by the Canadian Seed Growers’ Association, currently recommends operating
procedures that achieve high seed purity."
When we did our roguing on SWSW Sadash we were allowed 6 maximum off types of all wht plants (including Red Wheat) in 10,000 plant count for Certified. Foundation is 1 in 10,000 plants max impurity.
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