White-marked tussock moth

Taxonomic position: The white-marked tussock moth (Leucoma submarginata) belongs to the order Lepidoptera and the family Erebidae (subfamily Lymantriinae). This moth is recognized as a significant defoliator, primarily distributed across East Asian ecosystems, where it maintains stable populations in deciduous forests.

Host plants: The pest primarily targets trees within the Salicaceae family, specifically poplars (Populus spp.) and willows (Salix spp.). Additionally, the species has been observed on birch trees (Betula) and occasionally on various orchard fruit trees located in close proximity to forest areas or shelterbelts.

Biology and life cycle: The life cycle involves complete metamorphosis, including egg, larva, pupa, and adult stages. The insect typically overwinters as young larvae protected within silken webs or bark crevices. As temperatures rise in spring, the larvae emerge to feed on developing foliage, undergoing several instars of rapid growth before pupating within loose cocoons woven between leaves.

Damage characteristics: The primary economic damage is caused by the larval stage. Young larvae initially skeletonize the leaf surface, while older larvae consume the entire leaf lamina, often leaving only the main veins intact. Severe infestations lead to total crown defoliation, which causes physiological stress, reduced radial growth, and susceptibility to secondary infections or pathogens.

Control measures: Management strategies for Leucoma submarginata require a multi-faceted approach. Preventive measures include regular forest monitoring for early larval nests and maintaining the health of tree stands to ensure natural resistance. When populations reach economic thresholds, integrated pest management (IPM) practices are deployed, including the application of biological insecticides or chemical treatments targeted at active larval stages.