Challenges with Managing insecticide resistance in UK ...% of English Myzus persicae field samples...
Transcript of Challenges with Managing insecticide resistance in UK ...% of English Myzus persicae field samples...
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Challenges withManaging insecticide resistance in UK
pests
Steve Foster
Rothamsted Research
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Peach-potato aphidMyzus persicae
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MACE (pirimicarb)
kdr and super-kdr (pyrethroids)
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0
20
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% sa
mples con
taining resis
tant aph
ids
MACE
Myzus persicae field samples containingMACE, kdr and super-kdrne aphids
Yearkdr super‐kdrne
Tested from 2011 onwards
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 20152016
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Loss of Pirimicarb
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Response to neonicotinoids
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Neonicotinoid Resistance CategoriesNic‐S SusceptibleNic‐R Low resistanceNic‐R+ Moderate resistanceNic‐R++ Strong resistance
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Nic-R+
100 ppm imidacloprid
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Nic-R++
100 ppm imidacloprid
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% of English Myzus persicae field samples containing aphids with low (Nic-R) neonicotinoid resistance
% s
ampl
es
0
20
40
60
80
100
2015
The good news continues..No Nic-R+ or Nic-R++ found
Year2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2016
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EU restriction on neonicotinoid seed treatmentsInitially from December 2013 to December 2015
Now extended…..
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English suction trap sites
Kirton
Broom’s Barn
Rothamsted
WyeStarcross
Newcastle
Preston
Hereford
Wellesbourne
Writtle
http://www.rothamsted.ac.uk/insect-survey/STTrapSites.php
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English Myzus persicae field population
‘O’ Type ‘P’ Type
>85% of aphidscollected in suction trapsMACE-SR/super-SRne
Super-clones
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Myzus persicae samples collected from
Field vs Protected crops
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Grain aphid,Sitobion avenae
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Diversity/clonal nature of UKSitobion avenae population?
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Sitobion avenae asexual aphid reproduction
PredominantSuper-clone
with kdr
kdr-SRSA3
kdr-SS kdr-SSkdr-SS kdr-SSkdr-SS
kdr-SSkdr-SRSA3
kdr-SSkdr-SS kdr-SS kdr-SS
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Sitobion avenae 2016 sample from Forfar in Scotland
“We are seeing some issues with grain aphids that are resistant to pyrethroids this Autumn. I have a grower who sprayed some early‐sown winter barley and wheat soon after emergence to control aphids. I am assuming that we have a resistant population present.
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kdr‐SRs present
Sprayed with 30 mls Hallmark Zeon (60% rate)
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Cabbage stem flea beetle (Psylliodes chrysocephala)Adult damage
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Management options (autumn 2014 onwards)
NNIseed treatment
PYRfoliar spray
X
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“Play dead….make them thinkthat their pyrethroid sprays are working…”
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0% resistant beetles>0%-50% resistant beetles
Response to field rate
>50% resistant beetles
Resistance to lambda-
cyhalothrin (7.5 g ai/ha)
in CSFB samples(2016)
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
-6.00 -5.00 -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00
No Mobiles
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0% resistant beetles>0%-50% resistant beetles
Response to field rate
>50% resistant beetles
Resistance to lambda-
cyhalothrin (7.5 g ai/ha)
in CSFB samples(2016)
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
-6.00 -5.00 -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00
>0-50% Mobiles No Mobiles
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0% resistant beetles>0%-50% resistant beetles
Response to field rate
>50% resistant beetles
Resistance to lambda-
cyhalothrin (7.5 g ai/ha)
in CSFB samples(2016)
50.00
51.00
52.00
53.00
54.00
55.00
56.00
57.00
-6.00 -5.00 -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00
>0-50% Mobiles No Mobiles <50% Mobile
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Pea and bean weevilSitona lineatus
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Pollen beetle (Meligethes aeneus)
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Diamond back moth (Plutella xylostella)
Curtesy, Mark Mallott
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Px1 (30 adults, Great Saxam, Suffolk). Collected 14/6/16 (Alan Dewar, Dewar Crop Protection).
Px2 (Eggs/larvae on leaves, Kirton, Lincs). Collected 11/7/16 (Simon Jackson, Allium and Brassica Agronomy Ltd.).
Px1 (Eggs/larvae on leaves, St Monans, East Fife). Collected 28/6/16 (Jeff Layton, Kettle Produce).
Pyrethroid resistance.No resistance to diamides or spinosad.
UK Plutella xylostella samples (2016)
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Leaf-dip bioassays exposing L2 larvae to insecticides
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No resistance
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Some resistance
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Strong resistance
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Saw-toothed Grain beetleOryzaephilus surinamensis
Striped Flea Beetle Phyllotreta striolat
Seed WeevilCeutorhynchus assimils
Bruchid BeetleBruchus rufimanus
Grain WeevilSitophilus granarius
Other pests where pyrethroid resistance is looming?
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Di CoxMark Mallott
Linda OliphantRothamsted Insect Survey