First record of Lilioceris lilii (Scopoli) (Coleoptera: Chrysomelidae) on Lilium michiganense Farwell and confirmation of its association with Streptopus lanceolatus (Aiton) reveal (Liliaceae).
In July 2015, a report of a lily leaf beetle (Liliocerus lilii [Lilioceris lilii]) infection on Lilium michiganense in Burlington, Ontario, Canada, was received. A survey of 235 Lilium michiganense plants was conducted on 3 August 2015 to document this infestation. Plants were surveyed to estimate damage (percentage of leaf area damage per plant) and presence of lily leaf beetle (eggs, larvae and adults). The percentage of plants infested was 40.0% (n=94); 36.2% (n=85) of plants had one or more adults (among these were 12 copulating pairs), 8.9% had one or more larvae, and 0.9% had one or more eggs. The mean feeding damage among plants was 36%. On 17 June 2015, the entire Gatineau Park (Quebec, Canada) population (n=282) of S. lanceolatus were surveyed. The percentage of plants infested with at least one life stage (adult, unhatched/hatched eggs, or larvae) was 4.6%. Only one adult was found. Eggs were observed on 11 plants (3.9% of all plants), and 2 plants (0.7% of all plants) had early instars. Minimal feeding damage was noted on a few leaves where eggs had hatched (larvae present or deceased); however, no late instars were found. This is thought to be the first report of Liliocerus lilii on Lilium michiganense and confirmation of its association with S. lanceolatus.