The yield losses attributed to Asian citrus greening disease once established can be devastating. If the disease continues to spread unabated in the citrus growing regions of East Africa, the annual value of lost production could potentially reach up to US$127 million over the next ten to 15 years, according to a recent paper published by CABI. The paper, The Asian Citrus Greening Disease (Huanglongbing): Evidence Note on Invasiveness and Potential Economic Impacts for East Africa (Jun 2021; PDF | 2.9 MB), provides a review of the global literature on Asian citrus disease or huanglongbing (HLB) and estimates its potential economic impact on East Africa. The paper also makes recommendations for biosecurity preparedness, surveillance and management options to help decision-makers and citrus growers.
Restoring islands through the removal of non-native invasive mammals is a powerful biodiversity conservation tool. This new study now shows that human communities on islands could benefit from restoration actions, which can potentially reduce or eliminate the burden of diseases transmitted to people by invasive species. Simply put, removal of invasive species can benefit human health in addition to ecological health.
Science of the Total Environment 819 (2022) 153404
The global increase in biological invasions is placing growing pressure on the management of ecological and economic systems. However, the effectiveness of current management expenditure is difficult to assess due to a lack of standardised measurement across spatial, taxonomic and temporal scales.
Since 1960, management for biological invasions totalled at least $95.3 billion.
Damage costs from invasions were substantially higher ($1130.6 billion).
Pre-invasion management spending is 25-times lower than post-invasion.
Management and damage costs are increasing rapidly over time.
Proactive management substantially reduces future costs at the trillion-$ scale.
Chinese privet (Ligustrum sinense) is one of the worst invasive plants in the South. It dominates the shrub layer and often becomes the only shrub underneath trees, especially in streamside areas. But insects and spiders living in fallen leaves and leaf litter were not affected by a privet invasion in Georgia, as a recent study shows.
Chinese tallow tree (Triadica sebifera) is a nonnative, invasive tree whose decaying leaf litter alters water quality and the microbial community in the wetland habitats. This negatively impacts the lifecycle of semi-aquatic species like frogs.
To date no studies have been undertaken on the costs and benefits of IAS management in the Caribbean. This may partly explain why there has been negligible funding to combat the onslaught of these exotic species in the region. As a result it was decided to provide individuals involved in the UNEP-GEF Project, "Mitigating the Threats of Invasive Alien Species in the Insular Caribbean" with training and an opportunity to undertake Cost-Benefit Analyses (CBAs) on some selected IAS. The CBAs undertaken and reported in this publication clearly demonstrates that the benefits of managing IAS outweigh the costs.
Holmes, Thomas P.; Aukema, Juliann E.; Von Holle, Betsy; Liebhold, Andrew; Sills, Erin. 2009. Economic impacts of invasive species in forest past, present, and future. In: The Year In Ecology and Conservation Biology, 2009. Ann. N.Y. Acad. Sci. 1162:18-38.
Managers often struggle to calculate the ecological and economic costs associated with invasive species. Yet, knowing these impacts can boost support and understanding for invasive species management. In a new book chapter, NWRC economist Dr. Stephanie Shwiff and colleagues describe how economists determine costs of both primary and secondary impacts from invasive species and how these translate into jobs and revenue in regional economies.