Oilseed rape update on new rl varieties and disease management
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Oilseed Rape Update on new RL varieties and disease management. Paul Gosling Research & KT Manager (Agronomy). Recommended list new additions for 2012. Oilseed rape. * The spring OSR list is descriptive. Spring varieties. New. Yield. Winter varieties.

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Oilseed Rape Update on new RL varieties and disease management

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Oilseed RapeUpdate on new RL varieties and disease management

Paul Gosling

Research & KT Manager (Agronomy)


Recommended list new additions for 2012


Oilseed rape

* The spring OSR list is descriptive


Spring varieties

New

Yield


Winter varieties


Seasonal variation in oilseed rape E/W yields (controls & new)

Average yield gain worth £140/ha based OSR @ £350/tonne


Restored hybrid varieties

New

Resistance

DK Expower contains the RLM7 resistance gene giving good resistance to Phoma


Conventional varieties

New

Agronomy

DK Camelot is an earlier maturing variety


Semi-dwarf RH - East/West

New

Yield

Agronomy

Thorin is a high yielding semi dwarf variety with short stiff stems


Clubroot resistant RH

New

Yield

Resistance

Cracker provides growers with a combination of light leaf spot resistance and clubroot resistance


New information on disease management


Clubroot

RD-2007-3373

Management 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 detection

Healthy

Diseased


Clubroot distribution

RD-2007-3373

50% of Scottish samples

54% of English samples


Effect on yield


Clubroot persistence

Modelled from Swedish data


Field trial results - RD-2007-3373


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.


Topic sheet


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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