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Seasonal phenology and activity of spotted lanternfly (Lycorma delicatula) in eastern US vineyards

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Abstract

Spotted lanternfly (SLF) is an invasive insect pest in the northeastern USA, and current projections suggest global spread of this insect. SLF is particularly damaging in grape; however, little is known about SLF activity and phenology in vineyards. In 2018–2019, adult SLF populations were monitored in 7–9 Pennsylvania vineyards using weekly visual assessments of vines. Additional studies were carried out in 2019 to identify the daily activity (e.g., feeding, mating, flying) of SLF adults in vineyards. Weekly monitoring data revealed that adults infested vineyards in late summer and populations peaked in early to mid-September. Nymphs were observed on vines in the spring, but nymphal populations did not persist at high levels throughout the season (< 5 SLF/vine). Prior to harvest, SLF was predominantly found on the shoots, but after harvest, greatest proportions of SLF were found on the trunk. Both feeding and dispersal activity increased throughout the day with greatest proportions of these activities observed in the afternoon and evening compared to morning observations. Daily increases of SLF on vines were positively correlated with SLF dispersal, suggesting high input from the surrounding landscape and potential need for area-wide management of this pest. Understanding seasonal patterns of SLF may improve management of this pest through timing control measures with population influxes both diurnally and seasonally.

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Acknowledgements

We thank Elizabeth Deecher for her technical assistance and the growers who allowed us access to their vineyards throughout the duration of this study. This work was supported in part by the USDA-APHIS-PPQ under Agreement Number AP19PPQFO000C369 and the Pennsylvania Department of Agriculture under Agreement Number 44144949.

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  1. Ashley Leach have contributed equally to this work.

Authors and Affiliations

  1. Entomology Department, Penn State University, University Park, PA, USA

    Heather Leach

  2. Entomology Department, Purdue University, West Lafayette, IN, USA

    Ashley Leach

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  1. Heather Leach
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  2. Ashley Leach
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Correspondence to Heather Leach.

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Communicated by D.C. Weber.

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Leach, H., Leach, A. Seasonal phenology and activity of spotted lanternfly (Lycorma delicatula) in eastern US vineyards. J Pest Sci 93, 1215–1224 (2020). https://doi.org/10.1007/s10340-020-01233-7

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