2. 2012 Survey Summary
• 170 flying hours covering around 24,000 miles
• 79,058 Ha of larch surveyed across England,
Wales, Scotland, N Ireland & IOM (increase in
around 10,000 Ha compared to 2011)
• Equates 70% of all larch that has been
analysed across the UK both on respective PFEs
and in PW
• In England this resulted in increased
investigations of 597 sites (compared to 455 in
2011) which in turn lead to the issuing of 163
Statutory Notices (compared to 120 in 2011)
3. 2012 Survey Summary
• Observation of disease dynamics continue to be different in
different parts of the country – the more larch, the bigger the problem
• Significant new findings in SW Scotland, significant increase in S
Wales, limited new findings in the Forest of Dean and SE England
• Weather conditions have been extremely conducive for Pr
throughout 2012 – likely to see further infection
• Further findings generally being made in association with known
infected sites (both rhodo & larch), but rapid advance of symptoms in
some locations were observed over the summer
14. 2010 SW England
DISTRIBUTION OF LARCH FROM 2010 INFECTIONS
0
1000
2000
3000
4000
5000
6000
7000
8000
2010 Infected 0-2km 2-5km 5-10km >10km
Hectares
Uninfected Larch Infected Larch
Total Area of Larch = 10,650 ha
Infected area in 2010 = 1,261 ha (12%)
15. 2012 Survey Summary
SW ENGLAND - PROXIMITY OF NEW INFECTIONS TO EXISTING INFECTIONS
0
1000
2000
3000
4000
5000
6000
7000
8000
2010 Infected 0-2km 2-5km 5-10km >10km
Hectares
Uninfected Larch Infected Larch
Total Area of Larch = 10,650 ha
Infected area in 2012 = 2,073 ha (19%)
16. 2012 Survey Summary
SW ENGLAND - PHYTOPHTHORA STATUS ON LARCH AT END OF 2012
0.0
500.0
1000.0
1500.0
2000.0
2500.0
3000.0
3500.0
4000.0
4500.0
D
evonG
loucestershire
Cornw
all
Som
erset
W
iltshire
D
orset
N
orth
Som
erset
Plym
outh
South
G
loucs
Bath
&
N
E
Som
erset
Torbay
Hectares
Uninfected Larch Infected Larch
54%
18%
23%
6%
6%
5%
17. Phytophthora ramorum symptom
progression on infected larch stands
in the UK
• Cold spring delayed start of
aerial surveillance by nearly 4
weeks
• Flights started in England and
Wales in the 10th May, 4 flights
undertaken so far, 2 in Wales and 2
in England.
• FC Scotland undertaking their
own surveillance this year, flight
started 22nd May
• Flights undertaken to the Lake
District and Wales last week, and
along the South Coast and to E
Anglia this week
2013 Surveillance
25. 2013 So Far……….
• Observations in general haven’t been good…highlighting further
the pattern of the more larch, the bigger the problem once infection
becomes established
• Significant but manageable findings in the SW, but the scale of
infection in S Wales will lead to unprecedented logistical challenges
with the potential for collateral damage to other species both in and
out of the forest / woodland environment
• Observations continue to highlight that early detection and prompt
action is still the most effective way of managing the disease across
hosts species including rhododendron
