Thrips Flight and TSWV Risk Assessment Report – May 10, 2018

— Written By

This is the tenth thrips flight and TSWV risk assessment report. Read about why we are posting these reports and more in our first reportRead more about tobacco thrips biology and TSWV transmission.

Third generation thrips flights are now predicted to occur within 14 days at some of our locations, so growers should pay close attention to conditions in their area. Growers are reminded to use the most recent information available to make management decisionsThe predictions presented below will improve as we get closer to predicted thrips flight dates. The information presented here is intended to supplement, but not replace, farm-specific predictions.

One of our extension agents pointed out that ZIP codes were not generating reports at some locations. If an address or ZIP code does produces an error message at the Tobacco Thrips and TSWV Risk Forecasting Tool, please use the map to select your location instead. Using the map has not produced error messages.

Kenly is a relatively low TSWV risk site, situated within large acreage production areas in Johnston and Wilson Counties. As of today, TSWV infection risk in Kenly is lower than in a typical year. The third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is not expected to occur during the next 14 days. At this time last year, we were 101% of the way to the third generation thrips flight, and this year, we are 74% of the way to the third generation thrips flight.This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 10Growers near Kenly planning to transplant within the next 14 days likely do not need to take additional management precautions for TSWV at this time.

Beulaville is a higher TSWV risk site in Duplin County. As of today, TSWV infection risk in Beulaville is lower than in a typical year. At this time last year, we were 106% of the way to the third generation thrips flight, and this year, we are 83% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 4. This year, the third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is expected to occur on May 21. Growers near Beulaville who have not already transplanted and are transplanting 10 days or less before May 21 should consider using Actigard as a greenhouse float water treatment. Growers who have already transplanted tobacco should consider making a foliar application of Actigard 3 days before May 21.

Kinston is a moderate TSWV risk site in Lenior County and also houses the NCDA & CS Cunningham Research Station where we conduct tobacco research. As of today, TSWV infection risk in Kinston is slightly lower than in a typical year. At this time last year, we were 104% of the way to the third generation thrips flight, and this year, we are 80% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 5. This year, the third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is expected to occur on May 25. Because TSWV infection is predicted to be lower than a typical year and Kinston is a lower risk location, additional treatments against TSWV are not recommended for this location. Growers who are interested in making additional treatments against TSWV should consult their location extension agent for recommendations or contact Hannah.

New Bern is a higher TSWV risk site. As of today, TSWV infection risk in New Bern is lower than in a typical year. At this time last year, we were 115% of the way to the third generation thrips flight, and this year, we are 88% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 5. This year, the third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is expected to occur on May 19. Growers near New Bern who have not already transplanted and are transplanting 10 days or less before May 19 should consider using Actigard as a greenhouse float water treatment. Growers who have already transplanted tobacco should consider making a foliar application of Actigard 3 days before May 22.

Windsor is a higher TSWV risk site. As of today, TSWV infection risk in Windsor is about the same as in a typical year. The third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is not expected to occur during the next 14 days. At this time last year, we were 94% of the way to the third generation thrips flight, and this year, we are 73% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 16Growers near Windsor planning to transplant within the next 14 days likely do not need to take additional management precautions for TSWV at this time.

Whiteville is a moderate TSWV risk site in Columbus County and also houses the NCDA & CS Border Belt Tobacco Research Station where we conduct tobacco research. As of today, TSWV infection risk in Whiteville is slightly lower than in a typical year. At this time last year, we were 111% of the way to the third generation thrips flight, and this year, we are 86% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 5. This year, the third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is expected to occur on May 19. Growers near Whiteville who have not already transplanted and are transplanting 10 days or less before May 19 should consider using Actigard as a greenhouse float water treatment. Growers who have already transplanted tobacco should consider making a foliar application of Actigard 3 days before May 19.

Carthage is a relatively low TSWV risk site in Moore County. As of today, TSWV infection risk in Carthage is about the same as in a typical year. The third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is not expected to occur during the next 14 days. At this time last year, we were 99% of the way to the third generation thrips flight, and this year, we are 64% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 11Growers near Carthage planning to transplant within the next 14 days likely do not need to take additional management precautions for TSWV at this time.

Clinton is a higher TSWV risk site in Sampson County. As of today, TSWV infection risk in Clinton is slightly less than in a typical year. At this time last year, we were 108% of the way to the third generation thrips flight, and this year, we are 88% of the way to the third generation thrips flight. This means that the population is maturing slower in 2018 than in 2017. Last year the third generation thrips flight occurred on May 3. This year, the third generation tobacco thrips flight (the generation that typically transmits the most TSWV) is expected to occur on May 19. Growers near Clinton who have not already transplanted and are transplanting 10 days or less before May 18 should consider using Actigard as a greenhouse float water treatment. Growers who have already transplanted tobacco should consider making a foliar application of Actigard 3 days before May 18.

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. The following information is needed:

1. Field location (address, coordinates, nearest ZIP code, or selected from a map)

2. TSWV infection percentage in a typical year at this location

In addition, you can provide the following optional information which will improve recommendations:

3. Anticipated planting date

4. Greenhouse applications of imidacloprid and/or Actigard

More Information

Tobacco thrips – Tobacco Growers Information

Written By

Photo of Hannah Burrack, N.C. Cooperative ExtensionDr. Hannah BurrackAssoc. Professor and Extension Specialist (Berry, Tobacco and Specialty Crops) (919) 513-4344 hannah_burrack@ncsu.eduEntomology & Plant Pathology - NC State University
Posted on May 10, 2018
Was the information on this page helpful? Yes check No close
Scannable QR Code to Access Electronic Version This page can also be accessed from: go.ncsu.edu/readext?526378