Dryocosmus kuriphilus found in Aargau canton (CH)
In Switzerland, the presence of Dryocosmus kuriphilus (Hymenoptera: Cynipidae - EPPO A2 List) was detected for the first time in 2009, in Ticino canton (EPPO RS 2009/107). In July 2011, D. kuriphilus was detected in a nursery in Aargau canton. During a regular inspection (for plant passports), insect galls were observed on chestnut trees (Castanea sativa) but no particular damage was noticed. It is suspected that the pest has been introduced into this nursery by the import of infested plant material. By the end of July 2011, all infested chestnut trees (and all plants belonging to the same lots) were destroyed and phytosanitary measures were taken to prevent any further spread: establishment of a demarcated zone (infested zone, focus zone with a radius of 5 km beyond the infested zone, buffer zone with a radius of 10 km beyond the focus zone), prohibition of plant movements within and out of the demarcated zone, strict surveillance in the demarcated zone for a period of 3 years.
The pest status of Dryocosmus kuriphilus in Switzerland is officially declared as: Transient, actionable under eradication.
Sources
NPPO of Switzerland (2011-08).