Emerald Ash Borer (Agrilus planipennis Fairmaire) Damaging Bottomland Forest in North-Central Texas, USA

Abstract

Emerald ash borer (Agrilus planipennis Fairmaire) (EAB), a phloem-feeding beetle native to Asia, continues to destroy ash trees across the United States. The objective of this study was to assess EAB damage to green ash (Fraxinus pennsylvanica) and seedling recovery in dwindling (remnant) bottomland near a water supply reservoir in Denton County, Texas. EAB damage was extensive; however, numerous seedlings were thriving and suggest the area will recover. Large trees suffered the most damage. Of 101 large-diameter (16–60 cm) trees, only nine were alive, and none were in good health. In a small-diameter (2.5–15 cm) class, only 49 of 174 trees were living, and 15 were in good health. Interior excavation galleries on a recently fallen tree indicate EAB may have been present in Denton County earlier than previously documented. This study highlights the continued spread of EAB in the southern part of its range, recovery patterns, and a need for public outreach as part of an integrated management plan to address the problem.