I have never seen a Lily Beetle at the farm to date and believe me I search my stock constantly.  They are however, abundant in all directions within fifty km and I probably answer more beetle related questions per day than anything else.  Lily Beetles are very easy to spot.  They are bright red like a ladybug, but the body is more elongated and has no spots.  If your lilies are infested, you will notice leaf damage first.  With close inspection, especially on the bottom side of the foliage you will see the red adult beetle or the larvae stage which looks like a bit of dirt.  The larvae actually cover themselves with their own excreta for protection.  Heavy infestations may result in stripped Lilies and Fritillaries.

Adults emerge from the soil in April and May.  They feed on your lilies and lay their eggs on the underside of the leaves.  These eggs will hatch in 7 days.  The larvae return to the soil and pupate into adults in two to three weeks.  Only one generation is produced in each season so it is important that they are controlled early to control the infestation.