Pyrrhalta is a genus within the
Chrysomelidae family, encompassing several species of leaf beetles, each with distinct habitat preferences. Notably,
Pyrrhalta viburni, commonly known as the viburnum leaf beetle, is native to Europe and Asia but has expanded its range to North America. This species predominantly inhabits regions where Viburnum species are present, as both larvae and adults feed exclusively on these plants. In North America,
P. viburni has been documented in various northeastern states, where it has spread extensively, posing a threat to native and cultivated Viburnum populations. This beetle primarily inhabits regions where elm trees (
Ulmus spp.) are found, as they serve as its primary host plants. The elm leaf beetle is often encountered in urban landscapes, particularly in areas where elm trees are prevalent. The habitats of
Pyrrhalta species are closely linked to the distribution of their host plants. Consequently, these beetles are typically found in environments such as forests, woodlands, urban parks, and gardens where suitable host plants are abundant. The expansion of their range, especially in non-native regions, is often facilitated by the widespread planting of their preferred host species. == Morphology ==