Emerald ash borer (Agrilus planipennis) as a potentially dangerous quarantine pest of Ukraine’s dendroflora

Abstract

The aim of this review is to consolidate current knowledge on the biology and distribution of the emerald ash borer (Agrilus planipennis), assess its impact on ash species, and analyze the expansion of this quarantine phytophagous pest’s range in Ukraine. The spread of invasive insects is one of the most pressing challenges in modern forestry, as it leads to biodiversity loss, reduced stability, and decreased productivity of forest stands. The emerald ash borer (Agrilus planipennis Fairmaire) is considered particularly dangerous due to its rapid colonization of new territories and severe damage to ash plantations. To minimize risks and prevent large-scale outbreaks, a set of preventive measures has been developed, focusing on early detection and containment of the pest. A key element of this strategy is the identification of infested areas and the implementation of systematic population monitoring. For this purpose, colored (purple, green) and pheromone traps are used, installed at well-lit forest edges at a density of one trap per 5 hectares before the expected flight of adults. Infestation diagnosis is carried out by removing bark to detect larval galleries, which allows timely confirmation of colonization. Affected trees should be promptly removed through selective or clear sanitary fellings during the autumn–winter period, followed by wood disposal. Preventive measures also include temporary restriction of large-scale ash plantations and the establishment of optimally dense stands, which enhances ecosystem resilience. An important component of biological control is the preservation and attraction of entomophagous species, particularly insectivorous birds such as woodpeckers, which effectively prey on larvae and pupae during overwintering. In regions where A. planipennis has not yet been detected, monitoring surveys are conducted to identify new invasions and assess potential risks of expansion. The findings have practical significance for improving monitoring systems and preventive strategies against hazardous pests, preserving biodiversity, and ensuring the ecological stability of forest ecosystems.