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  1. Oklahoma: Canola Schools – August 2 and 4

    July 20 @ 5:00 am - August 5 @ 1:00 am
  2. InfoAg Conference, St. Louis, Aug. 2-4

    August 2 @ 8:00 am - August 4 @ 5:00 pm
  3. Tennessee: Mid-South Ag Finance Conference, Martin, Aug. 3

    August 3 @ 8:00 am - 5:00 pm
  4. Arkansas: RiceTec Field Day, Harrisburg, Aug. 3

    August 3 @ 8:00 am - 5:00 pm
  5. New Mexico: Ag Science Center Field Day, Clovis, Aug. 3

    August 3 @ 8:00 am - 5:00 pm
  6. Texas: Cotton Fiber Quality Conference, Lubbock, Aug. 4

    August 4 @ 8:00 am - 5:00 pm
  7. Arkansas Rice Expo, Stuttgart, Aug. 10

    August 10 @ 8:00 am - 5:00 pm
  8. North Mississippi Row Crops Field Day, Verona, Aug. 11

    August 11 @ 8:00 am - 5:00 pm
  9. Texas: Small Grain Workshop, Brownwood, Aug. 11

    August 11 @ 8:00 am - 5:00 pm
  10. Texas: Pre-Plant Wheat Meeting, Amarillo, Aug. 12

    August 12 @ 8:00 am - 5:00 pm
  11. Kansas: Farm Succession Planning Seminar, Jewell, Aug. 16

    August 16 @ 8:00 am - 5:00 pm
  12. Illinois: Agronomy Day, Savoy, August 18

    August 18 @ 8:00 am - 5:00 pm
  13. Kansas: Farm Risk and Profit Conference, Manhattan, Aug. 18-19

    August 18 @ 8:00 am - August 19 @ 5:00 pm
  14. Kansas: Water Management Field Day, Colby, Aug. 23

    August 23 @ 8:00 am - 5:00 pm
  15. Georgia: Pest Manager Training Workshop, Savannah, Aug. 26

    August 26 @ 8:00 am - 5:00 pm
  16. Louisiana: Sweet Potato Field Day, Chase, Aug. 31

    August 31 @ 8:00 am - 5:00 pm
  17. Georgia Peanut Tour, Tifton, Sept. 13-15

    September 13 @ 8:00 am - September 15 @ 5:00 pm
  18. California Almond Conference, Sacramento, Dec. 6-8

    December 6 @ 8:00 am - December 8 @ 5:00 pm

Florida: Western Flower Thrips Develop Insecticide Resistance

Ernst Undesser
By Joe Funderburk, University of Florida May 9, 2014

The western flower thrips and thrips-vectored Tomato spotted wilt virus are key pest threats to Florida’s multi-billion dollar fruit and vegetable industry. Attempts to control the western flower thrips with broad-spectrum insecticides, applied on a routine calendar schedule actually elevates its pest status.

Western flower thrips have now developed resistance to most traditional insecticides, including the IPM-compatible spinosyns. Spinosyn insecticides include SpinTor, Radiant, and Entrust (organic label). As a result, producers are experiencing unacceptable losses from pest damage and ineffective pesticide applications.

Western flower thrips populations are regularly monitored for resistance in different crops and regions of Florida. The first record of resistance occurred in Palm Beach County in 2008. An educational program to enhance adoption of integrated pest management (IPM) was begun, and the use of spinosyn insecticides was temporarily suspended in Palm Beach and Broward Counties.

 

More recently, resistant western flower thrips populations that are resistant to spinosyns were detected in Hillsborough County. Populations in North Florida have remained susceptible, although a single resistant population was detected last year.

Preserving the use of the spinosyns against the western flower thrips is a high priority because:

  1. No insecticide has provided the high level of control;
  2. It conserves populations of the key thrips predator, the minute pirate bugs;
  3. It has a reduced-risk status;
  4. It has a broad-spectrum of activity against other important pests.

A resistance management protocol that is a good foundation for a sound IPM program includes the following components: positive identification of target pests, applying insecticides only when required, making accurate and precise insecticide applications, diversifying the types of management methods used in the crop, and conserving natural enemies.

In efforts to sustain the effectiveness of spinosyns in Florida, no more than two applications should be made on the same and sequential crops per year.  Be sure to understand spinosyn susceptibility in your growing area, and if new recommendations exist to optimize thrips management and spinosyn susceptibility.

Ernst Undesser
By Joe Funderburk, University of Florida May 9, 2014