Oilseed Rape Update on new RL varieties and disease management Paul Gosling Research & KT Manager...
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Transcript of Oilseed Rape Update on new RL varieties and disease management Paul Gosling Research & KT Manager...
Oilseed RapeUpdate on new RL varieties and disease management
Paul GoslingResearch & KT Manager (Agronomy)
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Recommended list new additions for 2012
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Variety Type Region Breeder
Marko* S RH - DSV
DK Camelot W Open pollinated E/W DEKALB
DK Expower W RH E/W DEKALB
Thorin W RH semi dwarf E/W LSPB
Palace W RH UK LSPB
Artoga W RH North Limagrain
Cracker W RH Sp UK LSPB
Oilseed rape
* The spring OSR list is descriptive
Spring varieties
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Marko Delight Tamarin
RH RH Conv
Gross output [109] 101 102
Oil content [44.5] 43.9 43.4
Lodging [8] 8 8
Shortness of stem [4] 6 6
Earliness of maturity [3] 7 6
New
Yield
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Winter varieties
Seasonal variation in oilseed rape E/W yields (controls & new)
6Average yield gain worth £140/ha based OSR @ £350/tonne
Restored hybrid varieties
DK Expower PR46W21
E/W gross output 105 109
Lodging [7] 8
Stem stiffness 7 9
Shortness of stem 6 6
Earliness of maturity 6 5
Phoma stem canker [9] 5
Light leaf spot 6 4
DK Expower contains the RLM7 resistance gene giving good resistance to Phoma
Resistance
New
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Conventional varieties
DK Camelot DK Cabernet
E/W gross output 106 108
Lodging [7] 8
Stem stiffness 7 9
Shortness of stem 8 7
Earliness of maturity 6 4
Phoma stem canker 6 6
Light leaf spot [5] 5
DK Camelot is an earlier maturing variety
Agronomy
New
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Semi-dwarf RH - East/West
Thorin DK Sequoia
E/W gross output 104 101
Lodging [8] 8
Stem stiffness 9 9
Shortness of stem 9 8
Earliness of maturity 5 6
Stem canker [5] 6
Light leaf spot 6 5
Thorin is a high yielding semi dwarf variety with short stiff stems
Yield
Agronomy
New
Clubroot resistant RH
Cracker Mendel
E/W gross output 97 94
Lodging 8 [8]
Stem stiffness 8 9
Shortness of stem 6 6
Earliness of maturity 6 6
Stem canker 4 5
Light leaf spot 9 5
Cracker provides growers with a combination of light leaf spot resistance and clubroot resistance
Yield
Resistance
New
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New information on disease management
Clubroot
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RD-2007-3373Management of clubroot (Plasmodiophora brassicae) in winter oilseed rape
RD-2008-3525 Brassicas: Further Development of “in field” tests for resting spores of clubroot and the development of clubroot control based on detectionDiseased
Healthy
Clubroot distributionRD-2007-3373
50% of Scottish samples 54% of English samples
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Effect on yield
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Clubroot persistence
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Modelled from Swedish data
Field trial results - RD-2007-3373
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Factor / Site Aberdeen Aberdeen Warwickshire Herefordshire 2008/ 2009
Aberdeen Shropshire2007/2008 2008/ 2009 2009/2010 2009/2010 2007/2008
Clubroot epidemic
Very low all season
Low all season Low in autumn and medium in
spring
Low in autumn and medium in
spring
Moderate in autumn and severe in summer
Very severe from early on
Autumn conditions
Cool and drier than average
Cool and very wet, early frosts
Dry at sowing Early winter
Wet Wet, cool Wet, warmer
Soil treatment effect
No Yes Yes Yes No No
Variety effect No No Yes Yes - YespH pre trial 6.8 6.6 6.5 6.1 6.6 6.5Calcium pre trial (mg/l)
1857 2407 1720 999 2127 1720
Clubroot severity pre trial (bioassay)
22.6 7.1 11.3 83 24.6 35
Project conclusions
• Clubroot can cause significant yield loses in OSR even crop failure.
• Neither varietal resistance or soil amendments offer complete and reliable control.
• The risks of clubroot increase when brassicas are grown in short rotations (less than 1 in 5?)
• Preventative action with lime will be beneficial in managing this disease where pressure is low.
• Varietal resistance is likely to be very successful initially but will be eroded in short rotations.
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Topic sheet
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Oilseed Rape 2012 and beyond
• New RL varieties showing increased yield and improved agronomic characteristics
• Watch for signs of clubroot - consider management options
Thank you
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