Spotted lanternfly (Lycorma delicatula) overwinter in egg masses for approximately eight months a year, representing the longest individual life stage. Therefore, the inactive egg mass life stage constitutes a good candidate for management practices. Laboratory bioassays were conducted in 2021-2023 and found that various pesticides and mycoinsecticides were efficacious against overwintering spotted lanternfly egg masses. In 2023, a field trial of malathion against an untreated check was investigated. Additionally, in 2023, two field trials were conducted to demonstrate the real-world applicability of mycoinsecticide treatments to overwintering spotted lanternfly egg masses. We found strong evidence that malathion provides ovicidal efficacy against hatching SLF nymphs. Furthermore, mycoinsecticide field trials demonstrated infection of hatching nymphs at levels greater than those observed in laboratory bioassays. The intention of this research is to provide stakeholders with additional novel tools to manage spotted lanternfly.
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