Lily beetles can decimate your lily plants. Learn to identify the signs of lily beetle attack and how to spot the culprit! This lily beetle had been munching its way through the leaves on my lilies today. I spotted the tatty leaves and went hunting for the little red devil! When disturbed, these beetles often fall off the plants and lie upside down on the soil where they cannot be so easily seen. I also found the eggs it had laid on the underside of the leaves.