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Events

  1. California: Advanced Precision Farming Course Offered Online, Nov. 14 – Dec. 16

    November 14 @ 8:00 am - December 16 @ 5:00 pm
  2. Texas: Private Pesticide Applicator License Training, Dec. 6, 15

    December 6 @ 8:00 am - December 15 @ 5:00 pm
  3. Kansas: K-State Program to Help Farmers Deal with Historic Ag Downturn

    December 7, 2016 @ 8:00 am - February 15, 2017 @ 5:00 pm
  4. Alabama: Corn and Wheat Short Course, Auburn, Dec. 12-13

    December 12 @ 8:00 am - December 13 @ 5:00 pm
  5. Texas: 55th Blackland Income Growth Conference, Waco, Dec. 13

    December 13 @ 8:00 am - 5:00 pm
  6. Indiana: Crop Adviser Conference, Indianapolis, Dec. 13-14

    December 13 @ 8:00 am - December 14 @ 5:00 pm
  7. Indiana: Beginning Farmer Workshop, Indianapolis, Dec. 14

    December 14 @ 8:00 am - 5:00 pm
  8. Indiana: 4 Farm Law, Taxes Workshops Available in Dec., Jan.

    December 14, 2016 @ 8:00 am - January 13, 2017 @ 5:00 pm
  9. Missouri: Crop Management Conference, Columbia, Dec. 15-16

    December 15 @ 8:00 am - December 16 @ 5:00 pm
  10. Texas: Corn Growers Conference, Austin, Jan. 3-5

    January 3, 2017 @ 8:00 am - January 5, 2017 @ 5:00 pm
  11. South Carolina: Ag Marketing Seminar, Myrtle Beach, Jan. 4-6

    January 4, 2017 @ 8:00 am - January 6, 2017 @ 5:00 pm
  12. South Carolina: 4 Upcoming Forest Management Workshops for Woodland Owners

    January 12, 2017 @ 8:00 am - February 10, 2017 @ 5:00 pm
  13. Delaware Ag Week to Feature Record-Setting Soy Farmer, Harrington, Jan. 12

    January 12, 2017 @ 8:00 am - 5:00 pm
  14. Louisiana: LSU Offers 3 Irrigation Workshops in Jan., Feb.

    January 17, 2017 @ 8:00 am - February 14, 2017 @ 5:00 pm
  15. Illinois: 4 Regional Crop Management Conferences in Jan., Feb.

    January 18, 2017 @ 8:00 am - February 15, 2017 @ 5:00 pm
  16. Texas: Red River Crops Conference, Childress Jan. 24-25

    January 24, 2017 @ 8:00 am - January 25, 2017 @ 5:00 pm
  17. Indiana: Ag Business Management Workshop, West Lafayette, Jan. 31 – Feb. 2

    January 31, 2017 @ 8:00 am - February 2, 2017 @ 5:00 pm
  18. Arkansas: Agribusiness Conference, Jonesboro, Feb. 8

    February 8, 2017 @ 8:00 am - 5:00 pm
  19. Texas: National Cotton Council Meeting, Dallas, Feb. 10-12

    February 10, 2017 @ 8:00 am - February 12, 2017 @ 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