Oilseed Rape
Update on new RL varieties and disease
management
Paul Gosling
Research & KT Manager (Agronomy)
1
Recommended list new additions for
2012
2
Oilseed rape
Variety
Type
Region
Breeder
Marko*
S RH
-
DSV
DK Camelot
W Open pollinated
E/W
DEKALB
DK Expower
Thorin
Palace
Artoga
Cracker
W
W
W
W
W
E/W
E/W
UK
North
Sp UK
DEKALB
LSPB
LSPB
Limagrain
LSPB
RH
RH semi dwarf
RH
RH
RH
* The spring OSR list is descriptive
3
Spring varieties
New
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
Yield
4
Winter varieties
5
Seasonal variation in oilseed rape
E/W yields (controls & new)
Average yield gain worth £140/ha based OSR @ £350/tonne
6
Restored hybrid varieties
New
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
6
4
Light leaf spot
Resistance
DK Expower contains the RLM7 resistance gene giving good resistance to Phoma
7
Conventional varieties
New
DK Camelot
106
DK Cabernet
108
[7]
8
Stem stiffness
7
9
Shortness of stem
8
7
Earliness of maturity
6
4
Phoma stem canker
6
6
[5]
5
E/W gross output
Lodging
Light leaf spot
Agronomy
DK Camelot is an earlier maturing variety
8
Semi-dwarf RH - East/West
New
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
[5]
6
6
5
Stem canker
Light leaf spot
Yield
Agronomy
Thorin is a high yielding semi dwarf variety with short stiff stems
Clubroot resistant RH
New
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
Yield
Resistance
Cracker provides growers with a combination of light leaf
spot resistance and clubroot resistance
10
New information on disease
management
11
Clubroot
RD-2007-3373
Management of clubroot
(Plasmodiophora brassicae)
in winter oilseed rape
Diseased
Healthy
RD-2008-3525
Brassicas: Further
Development of “in field”
tests for resting spores of
clubroot and the development
of clubroot control based on
detection
12
Clubroot distribution
RD-2007-3373
50% of Scottish samples
54% of English samples
13
Effect on yield
Yield t/ha@ 91% moisture content
7
y = -0.0294x + 3.8457
R² = 0.2225
6
5
4
3
2
1
0
0
20
40
60
% Clubroot index
80
100
14
Clubroot persistence
Modelled from Swedish data
15
Field trial results - RD-2007-3373
Factor / Site
Clubroot
epidemic
Autumn
conditions
Aberdeen
2007/2008
Aberdeen
2008/ 2009
Warwickshire
2009/2010
Herefordshire
2008/ 2009
Aberdeen
2009/2010
Shropshire
2007/2008
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
Cool and drier Cool and very
than average 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
-
Yes
6.8
1857
6.6
2407
6.5
1720
6.1
999
6.6
2127
6.5
1720
22.6
7.1
11.3
83
24.6
35
pH pre trial
Calcium pre trial
(mg/l)
Clubroot severity
pre trial
(bioassay)
16
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.
17
Topic sheet
18
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
20