# Electrophysiological and behavioral responses of fourth instar spotted lanternfly nymphs to hexanal

## TL;DR

Fourth instar spotted lanternfly nymphs have an olfactory organ that detects hexanal, which could help in managing these invasive insects.

## Contribution

Identification of an olfactory organ in spotted lanternfly nymphs and its response to hexanal.

## Key findings

- Fourth instar nymphs possess an olfactory organ with two placoid sensilla.
- Hexanal strongly attracts spotted lanternfly nymphs.
- Olfactory receptor neurons in the organ are tuned to hexanal and methyl salicylate.

## Abstract

The spotted lanternfly (
Lycorma delicatula
) is an invasive, polyphagous planthopper. We previously identified an olfactory organ on the labium in adults; here, we show that fourth instar nymphs possess a similar organ. This organ consists of two placoid sensilla, each housing two olfactory receptor neurons: one tuned to hexanal and the other to methyl salicylate. We also found that 10 µl of pure hexanal elicits strong attraction in nymphs. These results highlight the olfactory capabilities of SLF nymphs and identify hexanal as a potential attractant that could aid in monitoring and management of this insect.