Utah State University Extension warned in a July 31, 2025, factsheet that the invasive dotted paropsine leaf beetle poses a significant threat to eucalyptus plantings across the western United States and specifically to cut foliage producers within Utah.
Invasive Beetle Origins
The dotted paropsine leaf beetle, or DPLB, is an invasive pest native to Australia. According to research published by Utah State University Extension, the first detection of this beetle in the United States occurred in California in 2022. The pest is known to feed on several different eucalyptus species, with blue gum serving as its primary host.
Patterns of Plant Damage
The feeding patterns of the DPLB result in distinct and visible damage to host plants. Utah State University Extension reports that the damage includes the formation of semicircular notches along the edges of leaves. In addition to these notches, the beetles cause defoliation of young leaves and can lead to the dieback of shoot tips on the plants.
Economic and Regional Risks
Beyond the direct damage to individual plants, the presence of the beetle presents economic and environmental risks. Utah State University Extension noted that the pest is a threat to the eucalyptus plantings found throughout the western United States. For Utah specifically, the beetle poses a particular risk to the industry of cut foliage producers.
Scientific Documentation
The scientific findings regarding the beetle's impact were compiled by authors Marion Murray, Victoria Xiong, and Megan Kast of Utah State University. Their documentation serves as a guide for understanding how the DPLB interacts with eucalyptus species in the region.
Ongoing Monitoring
The information regarding the potential impact of the dotted paropsine leaf beetle remains a critical resource for understanding the ecological risks facing eucalyptus species in the western United States.
