update on health update...•170 phytophthoras currently known world-wide • could be as many as...
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SFTT Meeting: 1 November 2017
Update on
Phytophthora ramorum on larch in Scotland
Hugh ClaydenForestry Commission Scotland
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Ramorum on larch (cont)Approx. area of larch (2012):
FES 26,000 haPvt 39,000 ha
Total: 65,000 ha
Standing volume (2011):
FES 4.8 M m3
Pvt 12.6 M m3
Total: 17.4 M m3 (~ 250 m3 /ha)
Year No. larch SPHNs Ha larch under SPHN
2010 1 22011 3 162012 18 542013 53 2262014 16 542015 35 932016 61 2162017 47 (Provisional) 63 (Provisional)
Total 234 724
+
6-7k ha of larch with assumed infection
Av. Size
3 ha
Each dot = 500 ha
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Number of suspicious sites reported in 2017
Via helicopter: 388 (8% +ve for Ramorum)
Ground sightings: 108 (29% +ve for Ramorum)
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Ramorum on larch (cont)Why continue with SPHNs?
• Legal requirement
• ~ 99% larch outside the Management Zone is not known to be infected
• Have not seen a repeat of 2012/2013 surge
• Reduce threat to adjacent tree species e.g. SS, WH, DF, GF
• Phased market entry: harvesting resource remains available; market
development/maintenance; avoid significantwhitewood displacement (UKWAS issue)
• Tree health grant support available (but not in Management Zone)
• Reduce scale of visual and environmental (water, wildlife) impacts
• Reduce pest and fire risks
• Buy time for potential alternative treatments to emerge
• External confidence – investors, public, political
• The Phytophthora factor
• STHAG advice
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• 170 Phytophthoras currently known world-wide
• Could be as many as 500
• 42 known to be present in UK, a third beingpathogenic on woody species
• Recent work by FR & JHI at 15 ‘disturbed sites’ in Scotland detected 20 species, including 3 not previously recorded in the UK and 1 unknown species
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Phytophthora alni
(P. cambivora x P. fragariae)
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Ramorum on R. ponticum
Year No. R. ponticum SPHNs Ha R. ponticum under SPHN
2010 0 0
2011 3 3
2012 1 0.2
2013 1 0.1
2014 2 0 (both on Larch sites)
2015 2 0.2
2016 24 4
2017 55 13
Total 88 21
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Replanting after Ramorum
Phytophthora - advice to owners, agents and industry:
www.forestry.gov.uk/forestry/infd-868egu
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Replanting after Ramorum
FES Larch Strategy
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Dendroctonus micans
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Chalara
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