
The proximity of Tree of Heaven to other preferred hosts had no significant effect on how many spotted lanternflies were found per tree. Reduced sap flow later in the season on Tree of Heaven may contribute to this preference. However late season adults tend to move away from Tree of Heaven to grape vines, silver maple, willow, etc. While the adults can fly, they generally prefer to hop/jump and glide exposing their hindwings.

Tree of Heaven is the preferred host of fourth instar and adult spotted lanternfly. Preferred Host - Tree of Heaven (TOH), Ailanthus altissima Turgor pressure or sap flow of the plant appears to play a key role in whether spotted lanternfly finds it a good host because spotted lanternflies do not have strong muscles associated with their pumping mechanism. Eshenaur, with the New York State Integrated. But they do pose a serious risk to agriculture. Late-stage adults move from Tree of Heaven to other food sources in the fall, although the reasons for this are not clearly understood. These insects are not dangerous to humans or pets they don't bite or sting, and they aren't venomous. Native to Asia, spotted lanternfly bugs were first sighted in Pennsylvania in 2014 they've since spread in great numbers to 14 different states, according to the USDA.Fourth instar nymphs and adults have stronger beaks and are able to penetrate the trunks of trees, cordons, and the older growth of other perennial plants.The beaks of first, second and third instars are not strong enough to penetrate woody tissue so they primarily feed on annual plants or the current year growth in perennial plants.

It is hypothesized they are only feeding to get the energy needed to move on to a more preferred host. As an example, populations have been found feeding in corn and soybean fields for short periods of time, and spotted lanternfly nymphs have been found feeding on basil, cucumber, rose, statice flowers and even grass though none are a preferred food source. It has been reported that spotted lanternfly feed on almost anything as they move from one area to another in search of a preferred food source.
