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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