The larvae are typically covered by blackish mucilaginous substances mixed with their own faeces, that seem to have a protective function. The specific epithet
merdigera derives from its habit, from Latin
merda (dung) and
gero (to carry). The adult beetles can produce chirping sounds through their stridulation apparatus on the anal segment. Adults overwinter in the soil. They emerge in April and May and can be seen until September. After mating, the females lay their yellow to brownish eggs on the underside of leaves of the host plants in rows with about six eggs. Eggs hatch into larvae in one-two weeks. After a month the larvae pupate in the soil. In about 20 days the adults emerge. Both the adults and the larvae feed on the leaves, buds, stems and flowers of several plants, mainly
Liliaceae,
Alliaceae and
Asparagaceae species, for instance Turk's cap lily (
Lilium martagon), onion (
Allium cepa), garlic (
Allium sativum),
Asparagus,
Polygonum and
Convallaria species. They can cause damages in case of heavy occurrence. ==Bibliography==