Hawthorn shield bug

Systematic position: The hawthorn shield bug (Acanthosoma haemorrhoidale) is a species of insect belonging to the order Hemiptera and the family Acanthosomatidae. It is commonly found throughout Europe and parts of Asia, frequently inhabiting gardens, orchards, and hedgerows where host plants are readily available for feeding and reproduction.

Biology and Life Cycle: Adults are easily recognizable by their green body with a reddish pronotum and tip of the abdomen, reaching up to 17 mm in length. The bugs overwinter as adults in leaf litter or under loose bark. Once temperatures rise in spring, they emerge, mate, and deposit eggs on the undersides of host leaves. The nymphs undergo several developmental stages before reaching adulthood by late summer.

Host plants and damage profile: The species is a sap-sucking insect that feeds on a wide range of plants. Key affected crops include:

• Hawthorn and rowan berries
• Raspberries and blackberries
• Various Rosaceae family trees

Damage and Impact: By piercing plant tissues with their proboscis, these bugs extract sap, causing significant stress to the host plant. Fruits damaged by the hawthorn shield bug often become misshapen and develop bitter, inedible spots due to the salivary enzymes injected during feeding. Furthermore, these injuries provide entry points for pathogens and secondary fungal infections.

Protection and Control: Integrated Pest Management (IPM) is the most effective approach. Cultural controls include removing debris and leaf litter where the insects hibernate. If infestation levels exceed the threshold of economic damage, the application of targeted insecticides is recommended. Always ensure applications are timed correctly to minimize impact on beneficial insects and to comply with pre-harvest intervals for safety.