The Inability of Spotted Lanternfly (Lycorma delicatula) to Vector a Plant Pathogen between its Preferred Host, Ailanthus altissima, in a Laboratory Setting

Abstract

With the recent introduction of the non-native spotted lanternfly (Lycorma delicatula) to the USA, research and concern regarding this insect is increasing. Though L. delicatula is able to feed on many different plant species, its preference for the invasive tree-of-heaven (Ailanthus altissima) is apparent, especially during its later life stage. Therefore, management focused on A. altissima control to help limit L. delicatula establishment and population growth has become popular. Unfortunately, the control of A. altissima is difficult. Verticillium nonalfalfae, a naturally occurring vascular-wilt pathogen, has recently received attention as a potential biological control agent. Therefore, we studied if L. delicatula fourth instars or adults could vector V. nonalfalfae from infected A. altissima material to healthy A. altissima seedlings in a laboratory setting. We were unable to re-isolate V. nonalfalfae from the 45 A. altissima seedlings or from the 225 L. delicatula utilized in this experiment. We therefore, found no support that L. delicatula could effectively vector this pathogen between A. altissima in laboratory conditions. Since L.delicatula’s ability to vector V. nonalfalfae has implications for the dissemination of both this beneficial biological control and other similar unwanted plant pathogens, future research is needed to confirm these findings in a field setting.

Host Preferences of Spotted Lanternfly and Risk Assessment of Potential Tree Hosts in Managed and Semi-Natural Landscapes

“…Economic losses are currently of greatest concern for grapes (Lee et al 2019; Urban 2019; Leach & Leach 2020a), although tree fruits, hops, nursery stock, and forestry also have been identified as potentially at risk for direct and indirect economic losses (Harper et al 2019; USDA-APHIS 2019). Plant diseases are not known to be vectored by L. delicatula (Urban 2019; Brooks et al 2020), and individuals do not bite humans or other animals, but L. delicatula is a notable nuisance pest in residential landscapes. Adult insects can be found in high densities on trees and shrubs in these landscapes; adults often fly in large aggregations in the autumn, and individuals produce copious amounts of honeydew (Urban 2019).…”