A recent study conducted by researchers at NYU has found that spotted lanternflies in New York City are now living longer than when they first arrived, with their life cycle extended by several months. The study utilized data from the citizen science database, iNaturalist, to track lanternfly sightings and found that the insects are hatching earlier and staying active longer in the urban environment. This extended lifespan allows the invasive insects more time to reproduce and spread, leading to increased damage to trees and plants.
The study attributed the lanternflies’ longer life cycles to the warming microclimate of urban areas like New York City, which provide a refuge for the bugs in colder climates. Additionally, a lack of predators and competition for food in the city has allowed the lanternfly population to thrive despite efforts by environmental officials to control their numbers. The insects have even been observed hitching rides on various modes of transportation, potentially spreading to new areas.
Spotted lanternflies pose a significant threat to agriculture, particularly to grape vines, as well as to urban trees like the tree of heaven. The insects weaken trees by feeding on their sap, making them more susceptible to disease and death. In addition, lanternflies excrete a sticky substance called honeydew, which promotes the growth of sooty mold that can suffocate plants. Efforts to control the lanternfly population in New York City are ongoing, but the study’s findings highlight the challenges posed by these invasive pests in urban environments.
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