How to Identify Common Buckthorn

Buckthorn species are wild hosts of spotted wing drosophila

http://www.omafra.gov.on.ca/english/crops/hort/news/allontario/ao0213a5.htm

The OMAFRA spotted wing drosophila (SWD) team learned a lot about SWD in 2012. Not only did the SWD spread rapidly throughout Ontario, but it was also found on a new wild host, common buckthorn (also known as European buckthorn) which is considered an invasive plant.

follow this link for more information 

www.omafra.gov.on.ca/english/crops/hort/news/allontario/ao0213a5.htm