It will definitely be lily beetle!! They liked to hang out on fritillaries and then move on to lilies if you have any?? I have a couple types of fritiliries, and then I have asiatic lilies and regal lilies. I have actually got toad, calla lilies and lily of the valley too! Haha. I personally use provado ultimate bug killer but I know a lot of people would prefer not to! It definitely gers rid of them though!!!!
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Lilly beetles love Fritillaries, often find them on mine.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border
lily beetle, I've got loads off one patch in my front wildflower meadow!