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Who‘s been eating
MY Strawberries?!
Dr Chris Thomas
Quekett Microscopical Club
www.quekett.org
This is a talk about invaders!
Drosophila suzukii
Spotted Wing Drosophila, SWD
Suzuki
D. suzukii


30% to 80% Soft fruit crop losses
This apparently
insignificant, 3 mm
long fly is causing
dignificant damage
to soft fruit and has
recently entered the
UK in 2012
Timeline of Global Domination
Japan 1930
N.America
2012
California
2008
Spain/Italy
2008
Hawaii
1980
UK
2012
Fruit Fly/Vinegar Fly
UK Drosophila sp.
1 mm
This is the
common
version of
the fruit fly
we find in
our gardens
and homes,
buzzing
around fruit
Male SWD
Male SWD‘s are immediately recogniseable under a hand
lens, having the distinctive single black wing spots
Female SWD
The female lacks the wings spots but …
Female SWD
It sports a large, serrated, egg laying ovipositor
Female SWD Ovipositor
Damage
When you think SWD, think insect with a chainsaw that cuts into ripening
fruit and lays ist eggs inside them – then think – Millions of them!
Commercial Control of SWD
• MONITOR
• IDENTIFY
• CONTROL
– Tidiness
– Insecticide
– Parasitoids
Gardens – Alternative
Reservoirs?
What any Member of the
Quekett Microscopical Club
can do (and schools too!)
Our Skills
• Skilled at capturing small subjects
• Skilled at looking at small subjects
• Skilled at Recording and Sharing
information
• Members throughout UK (and world!)
• Have our own publication – The Journal
Step forward please to
• Set a Fruit fly/Vinegar Fly trap this
October
• Record your catch
• Send your results to bulletin@quekett.org
• I‘ll collate and write up the results
• You will be credited in the paper.
Population growth
From Report:
Understanding and
developing methods for
managing spotted wing
drosophila (SWD) in
the UK: Vital research
to maintain the viability
of the UK fruit
Industry
Michelle Fountain/ Jerry
Cross, East Malling
Research, New Road,
East Malling, Kent ME19
6BJ
Trapping SWD
1. Cider vinegar in plastic bottle
2. Add a drop of Fairy Liquid
3. Pierce bottle with 2-3mm
diameter holes
4. Hang in garden for 1 week
5. Pour contents into a white plastic
tub
6. Observe & record using Low
power microscope
/magnifiers/camera/smartphone
Typical catch
Result Format
• Send me list with the following:
– Your name and address/postcode
– Date your fly trap harvested
– Total number of insects trapped
– Number of Fruit flies/Vinegar flies
– Number of MALE SWD
– Number of FEMALE SWD
Results
• 32 locations
• 51 sets data
• Included 1 school!
• Between 0 – 100s
Fruit flies per record
SWD v
Other Fruit
flies
(%)
A. Average of numbers of fruit
flies and SWD harvested in each
region.
B. Averages of the percentage of
SWD in each harvest.
The diameter of each circle is
proportional to average SWD harvest in
each region.
Male:Female
SWD (%)
A. The total numbers of males and
female SWD harvested in each
region.
B. Averages of the percent of males
and females for each individual
harvest.
The diameter of each circle is
proportional to average SWD harvest in
each region.
Lessons Learnt
• Great participation (10% Quekett
Members)
• Regional UK Bias to Central & Eastern
England
• Reliable records
• Need more data for significant results
Future
• Repeat
• Engage The North! (And the world)
• Aim to involve schools
• Open to advice and suggestions
NEW CITIZEN SCIENCE
Following on after the conference, I was inspired to set up a
citizen science project on www.iNaturalist.org
‘The Quekett Spotted Wing Drosphila
Survey Experiment’
You are heartily invited to join in at
https://www.inaturalist.org/projects/quekett-
spotted-wing-drosophila-survey-experiment
I look forward
to
Hearing from
You!
Contact Chris Thomas
chris@miltoncontact.com, subject SWD

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Whos been-eating-my-strawberries-jul17

  • 1. Who‘s been eating MY Strawberries?! Dr Chris Thomas Quekett Microscopical Club www.quekett.org
  • 2. This is a talk about invaders!
  • 3. Drosophila suzukii Spotted Wing Drosophila, SWD Suzuki D. suzukii  
  • 4. 30% to 80% Soft fruit crop losses This apparently insignificant, 3 mm long fly is causing dignificant damage to soft fruit and has recently entered the UK in 2012
  • 5. Timeline of Global Domination Japan 1930 N.America 2012 California 2008 Spain/Italy 2008 Hawaii 1980 UK 2012
  • 6. Fruit Fly/Vinegar Fly UK Drosophila sp. 1 mm This is the common version of the fruit fly we find in our gardens and homes, buzzing around fruit
  • 7. Male SWD Male SWD‘s are immediately recogniseable under a hand lens, having the distinctive single black wing spots
  • 8. Female SWD The female lacks the wings spots but …
  • 9. Female SWD It sports a large, serrated, egg laying ovipositor
  • 11. Damage When you think SWD, think insect with a chainsaw that cuts into ripening fruit and lays ist eggs inside them – then think – Millions of them!
  • 12. Commercial Control of SWD • MONITOR • IDENTIFY • CONTROL – Tidiness – Insecticide – Parasitoids
  • 14. What any Member of the Quekett Microscopical Club can do (and schools too!)
  • 15. Our Skills • Skilled at capturing small subjects • Skilled at looking at small subjects • Skilled at Recording and Sharing information • Members throughout UK (and world!) • Have our own publication – The Journal
  • 16. Step forward please to • Set a Fruit fly/Vinegar Fly trap this October • Record your catch • Send your results to bulletin@quekett.org • I‘ll collate and write up the results • You will be credited in the paper.
  • 17. Population growth From Report: Understanding and developing methods for managing spotted wing drosophila (SWD) in the UK: Vital research to maintain the viability of the UK fruit Industry Michelle Fountain/ Jerry Cross, East Malling Research, New Road, East Malling, Kent ME19 6BJ
  • 18. Trapping SWD 1. Cider vinegar in plastic bottle 2. Add a drop of Fairy Liquid 3. Pierce bottle with 2-3mm diameter holes 4. Hang in garden for 1 week 5. Pour contents into a white plastic tub 6. Observe & record using Low power microscope /magnifiers/camera/smartphone
  • 20. Result Format • Send me list with the following: – Your name and address/postcode – Date your fly trap harvested – Total number of insects trapped – Number of Fruit flies/Vinegar flies – Number of MALE SWD – Number of FEMALE SWD
  • 21. Results • 32 locations • 51 sets data • Included 1 school! • Between 0 – 100s Fruit flies per record
  • 22.
  • 23.
  • 24. SWD v Other Fruit flies (%) A. Average of numbers of fruit flies and SWD harvested in each region. B. Averages of the percentage of SWD in each harvest. The diameter of each circle is proportional to average SWD harvest in each region.
  • 25. Male:Female SWD (%) A. The total numbers of males and female SWD harvested in each region. B. Averages of the percent of males and females for each individual harvest. The diameter of each circle is proportional to average SWD harvest in each region.
  • 26. Lessons Learnt • Great participation (10% Quekett Members) • Regional UK Bias to Central & Eastern England • Reliable records • Need more data for significant results
  • 27. Future • Repeat • Engage The North! (And the world) • Aim to involve schools • Open to advice and suggestions
  • 28. NEW CITIZEN SCIENCE Following on after the conference, I was inspired to set up a citizen science project on www.iNaturalist.org ‘The Quekett Spotted Wing Drosphila Survey Experiment’ You are heartily invited to join in at https://www.inaturalist.org/projects/quekett- spotted-wing-drosophila-survey-experiment
  • 29. I look forward to Hearing from You! Contact Chris Thomas chris@miltoncontact.com, subject SWD