Verticillium Wilt in the UK Project Update
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Transcript of Verticillium Wilt in the UK Project Update
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Verticillium Wilt in the UKProject Update
Dr Peter GladdersADAS UK Ltd
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Review1. History in the UK
2. Disease surveys
3. Effects on yield
4. Varieties
5. Management options
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Introduction - Verticillium wilt First confirmed in UK in 2007
Pathogen is Verticillium longisporum – specific for crucifers (mainly brassicas)
Important in other parts of Europe with up to 50% yield loss
Grey microsclerotia – key diagnostic feature
Look for long streaks right up the stem – phoma similar
Only evident late in season
HGCA Research Review No 72 completed May 2009
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Disease Cycle of
OSR Verticillium
Wilt Plant debris or soil from nearby infested fields
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Disease Survey Samples – Variation by Field & YearProportion of samples (fields) from Crop Monitor positive
for V. longisporumYear Samples examined Positive % positive
2009 95 10 10.52010 97 24 24.72011 100 12 12.0
Number of samples with various proportions (%) of stems positive
Year 0-5 6-10 11-15 16-20 21-30 31-40 41-50 51-60 >60
2009 3 2 0 0 0 3 0 1 1
2010 12 2 4 1 2 0 1 2 0
2011 2 3 0 0 1 3 0 0 3
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Distribution of Verticillium Wilt 2009-2011
Factors affecting
distribution?
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Rotations and Verticillium Wilt2010
Previous crop No. samples % crops % plants
Oilseed 0 0.0 0.0
Wheat – OSR – Wheat 5 40.0 3.1
Wheat - Wheat - OSR 13 30.8 2.3
Other cereal – Wheat - OSR 9 11.1 1.0
Other Cereal - Other Cereal - OSR 0 0.0 0.0
3 Previous Non OSR Crops 22 18.2 *
4 or More Previous Non OSR Crops 42 26.2 *
Other / Unknown info 6 33.3
National 97 24.7 3.6
7
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Yield Impacts Numerous reports of yield effects when crops ripen prematurely
2012 – significant yield impacts
Single plants harvested from heavily infected crops
Decreased TSW by 12-24% when verticillium affected >50% stem
Further losses if seeds are shed
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Varieties Differ in their Resistance to Verticillium Wilt
Verticillium wilt at Bourne, Lincs 2010
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5
10
15
20
25
30
Cat
ana
Ora
cle
Alie
nor
Com
pass
Pal
ace
Cui
llin
Kry
pton
Dim
ensi
on
DK
Cab
erne
t
Ham
mer
Ses
ame
PR
45D
03
PR
46W
21
Exc
el
Flas
h
PR
45D
05
NK
Bra
vour
PR
45D
06
Kal
if
Es
Ast
rid
DK
ExM
en
DK
Sec
ure
Cas
tille
Exc
alib
ur
% p
lant
s af
fect
ed LSD 10.2
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Mean %verticillium by variety - Lincs 2010 & 2011(Limited variety experiments but main rankings have been consistent)
0
5
10
15
20
25
30
% v
ertic
illiu
m
AlienorCastilleCatanaCompassDimensionDK CabernetExcaliburFlashPalaceSesame
LSD = 9.9
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Managing Verticillium Wilt - Options
1. Determine its prevalence on individual farms
2. Good agronomy – a strong plant holds off verticillium
3. Variety choice
4. Extended rotations
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HGCA Project reference RD-2009-3618 Importance and management of Verticillium
wilt in winter oilseed rape
ADAS UK Ltd, Warwick-HRI, FERA, Farmacy/Hutchinsons