Halyomorpha halys

Brown marmorated stink bug

Description

Halyomorpha halys, known as the brown marmorated stink bug, is an invasive polyphagous pest originating from East Asia. It was introduced to Europe in 2004 and has since spread across the continent. This species feeds on over 100 types of plants, including fruit trees (Malus domestica, Prunus persica), ornamental trees, field crops (corn, soybeans), and vegetables. Adults use their piercing-sucking mouthparts to extract plant juices, causing localized tissue damage.

Severe infestations reduce crop yields and degrade fruit quality, rendering it unsellable. On trees, feeding results in fruit deformities and discoloration, negatively affecting both vitality and aesthetic appearance. Adults overwinter in sheltered areas, including human dwellings, and reemerge in spring to lay eggs. This species is univoltine in cooler climates but can have multiple generations per year in warmer regions.

Symptom

Feeding sites on fruits show dimpling, necrotic spots, and tissue collapse. On leaves, stippling and discoloration are common, while damaged seeds in pods remain hidden until harvest. Large bugs are present - the bands on the last two segments of the antennae (white stripes) serve as a reliable distinguishing feature.

Tree Species: Peach, Cherry, Pear, Apple Tree, Maple, Mulberry, Walnut, Plum

Part of a plant- attacked: Leaf / Needle, Fruit / Seed

Pest significance: Less harmful

Pest Category: Insects

Invasive Species: Yes

Present in EU: Yes