Scarlet Lily Beetle
Adult Scarlet Lily Beetle
Eggs on leaf underside
Description
Adult Scarlet Lily Beetles and their next generation grubs eat holes in the leaves of lily plants often leading to leaf drop that weakens the plant. The bulbs become smaller and flowering in subsequent years is reduced.
Symptoms
The adult Scarlet Lily Beetle is 6mm-8mm long with a black head and legs. The bright red wing coverings are easily spotted but the insect has a cunning defence mechanism that makes physical capture difficult. When disturbed, it drops to ground level, turns upside down where its black underside is difficult to locate. The grubs of the pest are even more sly, covering themselves with their wet, black excrement which protects them from predator attack while they openly eat the lily leaves.
Treatment and control
Spray with a general insecticide
Infested plants can be treated with acetamiprid, a systemic insecticide that gets inside the plant to control grubs and adults. Spray lilies with BugClear Ultra Gun! for Flowering Plants (contains acetamiprid) as soon as the first grub or adult is spotted. A further treatment 3 weeks later will help to control the grubs that may have hatched from previously laid eggs.
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