Thrips Flight and TSWV Risk Assessment Report – May 22, 2025
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Collapse ▲To help growers determine the potential of management practices for TSWV, we have created step-by-step guides on how to use the Tobacco Thrips Flight and TSWV Intensity Predictor to create Current Year TSWV Risk Assessments and Historical TSWV Predictions. Growers are strongly encouraged to create their own models using the information from their fields and season dates to plan for Tomato Spotted Wilt Virus (TSWV) management.
UPDATE: Predictive models for the locations below indicate a slightly higher estimated TSWV Risk than last week’s report (Assessment Report – May 12, 2025) for Kenly (4%), Kinston (7.6%), New Bern (7.4% ), and the Whiteville area (12.3%). Fields in multiple tobacco-producing areas (Kinston, Kenly, New Bern, Middlesex) have started showing symptoms of TSWV in the last 10 days and large numbers of thrips in the plants. While the numbers of tobacco thrips may be concerning (10-15 or more thrips per leaf based on 5/22/25 counts at Kinston), the number of thrips in the plants usually is not directly related to TSWV incidence, meaning we may find large number of thrips per plant and have a low incidence of the virus. Last Friday’s (5/16/25) TSWV incidence counts in our monitored fields in Kenly, Wilson, and New Bern showed 0.5%, 1.5%, and 4% TSWV incidence, respectively. This week’s counts will be published tomorrow (5/23/25) in for your reference.
Treatment in addition to standard insecticides is probably not required for areas with a history of <10% TSWV incidence. See the NC Agricultural Chemicals Manual and the NC Flue Cured and Burley Tobacco Guide for details on TSWV management practices and action thresholds.
The 3rd generation of tobacco thrips continues to disperse in all the reported areas. The 4th generation of thrips is expected to begin dispersing the first week of June for Kenly and Kinston, while they will begin dispersing by the end of May as estimated last week in the New Bern (May 30) and Whiteville areas (May 24).
This update was compiled based on Thrips Flight and TSWV Risk Assessments conducted for the four key tobacco-growing locations in NC included below. These models were created assuming no insecticide treatment and including the average historical TSWV incidence for each location as listed below (Fig. 8.1 modified from Mina, 2011).
- Kenly is a relatively low TSWV risk site (typically less than 8%), situated within large acreage production areas in Johnston and Wilson Counties.
- Kinston is a moderate TSWV risk site (typically less than 10%) in Lenoir County and also houses the NCDA & CS Cunningham Research Station, where extensive tobacco research is conducted.
- New Bern is a higher TSWV risk site (typically above 10%) in Craven County.
- Whiteville is a moderate to high TSWV risk site (around 8% or above 10%) in Columbus County and also houses the NCDA & CS Border Belt Tobacco Research Station, where tobacco research is conducted.
The models used for this summary are attached below for your reference. In order to get the most accurate risk assessment, we recommend you enter your own farm data into the TSWV and Tobacco Thrips Risk Forecasting Tool and check for any updates frequently.
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