Observatree volunteer activity from the start of the project (July 2014) to the end of September 2016

Number of hours recorded: 9516

Number of tree health site surveys completed: 2106

Number of Tree Alert reports verified: 42

Priority pest and disease findings:

  • Oriental chestnut gall wasp
  • Chalara dieback of ash
  • Acute oak decline
  • Dothistroma needle blight
  • Horse chestnut leaf miner
  • Oak processionary moth
  • Great spruce bark beetle
  • Sirococcus tsugae

Other key findings:

  • Dutch elm disease
  • Perenniporia
  • Armillaria
  • Cristulariella depraedans
  • Coral spot
  • Daldinia concentrica
  • Guignardia leaf blotch
  • Oak powdery mildew
  • Phytophthora alni
  • Phytophthora cinnamomi

Tree Alert activity between April 2015 and September 2016

Tree alert enquiries by country (1246 total) 

Top 5 host tree species (in order):

  • Ash
  • Oak
  • Cedars
  • Larch
  • Beech
Top pathogen reported: Chalara OLYMPUS DIGITAL CAMERA Top pest reported: Oak processionary moth Oak Processionary Moth - Credit Forestry Commission


Top 5 highlights:

  • Second GB case of oriental chestnut gall wasp found by Observatree volunteer
  • 9 oak processionary moth reports
  • Phytophthora austrocedri found in a new location
  • Phytopthora lateralis found in a new location
  • New cases of Sirococcus tsugae