Scientific name: Lilioceris lilii Scopoli
Native range: Europe and Eurasia
There are no federal, state or local regulations related to lily leaf beetle.
The lily leaf beetle was first found in North America in the 1940s (Montreal). It can now be found in most Canadian provinces, in the northeastern U.S. and Washington State. Lily leaf beetle was found near Wausau, Wisconsin, in 2014 and has also been reported in Thunder Bay, Ontario, and Winnipeg, Manitoba (map). Lily leaf beetle is not known to occur in Minnesota.
Adults emerge from the soil in early spring. Eggs are laid on host plants, and larvae feed on the undersides of leaves before entering the soil to pupate into beetles. Beetles emerge and continue to feed until winter. Only one generation occurs per year.
Lily leaf beetles are distinctive-looking beetles that will be recognizable in multiple stages of development. Look for bright red beetles, tan eggs laid in lines on the undersides of leaves, and bumpy, black larvae also on the undersides of leaves. The larvae cover themselves with their own excrement, likely to protect themselves from predators and parasitoids.
Host Plants and Impact - Lilium spp. and Fritillaria spp. are the primary hosts for lily leaf beetle; larvae only consume plants in these genera. Adults are reported to occasionally feed on other plants including hostas, hollyhock, potato, bittersweet, Solomon’s seal and lilly of the valley. Larvae cause most of the damage to plants and can completely defoliate host plants.
Contact the Minnesota Department of Agriculture via Arrest the Pest if you suspect an infestation of lily leaf beetle in Minnesota.