Management Recommendations SLF nymphs in 2022

By Katarzyna Madalinska and Anne Nielsen

New Jersey is currently in its 5^th year of invasion from spotted lanternfly. Populations are now widespread throughout the state and have established in almost every county in NJ. SLF pressure is variable throughout NJ’s counties, and we do not currently have a threshold for management of nymphs.

1st instar SLF in NJ vineyard – photo by K. Madalinska

SLF nymphs are hatching throughout the state and will continue to do so in the coming weeks. Despite seeing nymphs within the vineyard, we do not recommend immediate treatment at this time. Hatch will occur over a multiple week period depending on the site of egg masses and exposure. The early instars feed on new growth, particularly the underside of leaves and shoots. At this point there is no evidence that early instar feeding results in plant injury or yield loss. Peak abundance of SLF nymphs in vineyards is during their 1st to 2^nd instars approximately and 2-3 weeks after the first hatch. Management during their 2^nd instar will target the highest number of individuals and prevent additional treatments against nymphs. This timing typically coincides with other key pests within the vineyard, such as grape berry moth and Japanese beetle. Many broad-spectrum insecticide options for grape berry moth or Japanese beetle will also effectively kill SLF nymphs (see table) and insecticides against SLF will not be needed until the adult stage.

Always consult the label for further instructions.

*2(ee) approved for SLF in NJ grapes

E = excellent control
G = good control
F = fair control