Plane tree bug

Systematic position. The plane tree bug (Arocatus roeselii) is an insect belonging to the order Hemiptera and the family Lygaeidae. It is recognized as a specific pest associated primarily with plane tree species in various geographical regions.

Host plants and economic importance. The primary host is the plane tree (Platanus spp.). While it does not usually cause rapid tree death, high infestations of Arocatus roeselii lead to significant physiological stress in trees. By feeding on the phloem sap, these bugs cause chlorosis, premature leaf drop, and overall weakening of the tree's vitality in urban environments.

Biology and life cycle. The life cycle of Arocatus roeselii is closely synchronized with the phenology of its host. Adult bugs overwinter in sheltered locations, particularly deep within the bark crevices of mature plane trees or in nearby structural gaps. As spring temperatures rise, the insects become active, move to the foliage and tender bark, and begin their reproductive cycle.

Damage characterization. Damage is typically observed as localized patches of necrotic tissue where the insects aggregate. Frequent feeding causes the exhaustion of the plant's resources. In urban parks, these insects can become a nuisance not only due to their impact on tree health but also due to their tendency to aggregate on building facades and surrounding furniture during the warmer seasons.

Protection measures. Integrated management is the most effective way to control this pest:

• Mechanical removal of loose or dead bark where adults seek shelter for winter.
• Proper maintenance of tree crowns to ensure better air circulation and light penetration.
• Application of targeted insecticides against nymphs in spring or early summer.
• Monitoring of populations during peak periods to prevent mass outbreaks.