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1 March 2018 Factors Affecting Population Dynamics of Thrips Vectors of Soybean vein necrosis virus
Stacy Keough, Jonathan Danielson, Jordan M. Marshall, Doris Lagos-Kutz, David J. Voegtlin, Rajagopalbabu Srinivasan, Punya Nachappa
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Abstract

Thrips-infesting soybeans were considered of minor economic importance, but recent evidence of their ability to transmit a newly identified soybean virus, Soybean vein necrosis virus (SVNV), has raised their profile as pests. Season-long surveys were conducted using suction traps to determine the effects of temperature and precipitation on the spatiotemporal patterns of three vector species of SVNV, Neohydatothrips variabilis (Beach) (Thysanoptera: Thripidae) (soybean thrips), Frankliniella tritici (Fitch) (Thysanoptera: Thripidae) (eastern flower thrips), and Frankliniella fusca (Hinds) (Thysanoptera: Thripidae) (tobacco thrips) in soybean fields in Indiana in 2013 and 2014. In addition, soybean fields were surveyed for presence of SVNV in both years. We found that the magnitude and timing of thrips activity varied greatly for the three species. N. variabilis activity peaked in mid-August each year. The peak activity for F. tritici occurred between late-June, and a second peak in activity was observed in early-August, while F. fusca activity remained more or less the same with no peak. There was no gradient in thrips populations from southern to northern locations. This suggests that these insects are not migratory and may overwinter in soil or perennial noncrop host plants and other weed hosts in Indiana. The capture rates of N. variabilis and F. tritici were only related to temperature, and capture rates of F. fusca were not related to either variable. SVNV was first detected in mid-late August, which coincided with the peak of the primary vector, N. variabilis. The virus was not detected earlier in the season despite peaks in F. tritici activity. Our results may be used in weather-based models to predict both thrips dynamics as well as SVNV outbreaks.

© The Author(s) 2018. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.
Stacy Keough, Jonathan Danielson, Jordan M. Marshall, Doris Lagos-Kutz, David J. Voegtlin, Rajagopalbabu Srinivasan, and Punya Nachappa "Factors Affecting Population Dynamics of Thrips Vectors of Soybean vein necrosis virus," Environmental Entomology 47(3), 734-740, (1 March 2018). https://doi.org/10.1093/ee/nvy021
Received: 23 October 2017; Accepted: 29 January 2018; Published: 1 March 2018
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KEYWORDS
degree-day
population dynamics
Precipitation
Soybean vein necrosis virus
thrips
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