The Latest

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

Half-Rate Fungicides Decrease Effectiveness, Increase Resistance Development

Ernst Undesser
By Nathan Kleczewski, University of Delaware Extension Plant Pathologist July 14, 2014

Research has shown that when applied at labeled rates, fungicides can and do significantly increase crop productivity in disease favorable environments.  Rates provided on labels are determined by chemical companies following years of research and huge financial investments.  Not only are the rates chosen to give the grower adequate control of listed pathogens, but they also reduce fungicide resistance risk.

By applying fungicides at levels lower than the rates listed on the label you not only significantly reduce any benefit in terms of disease suppression, but also increase the chance that pathogens with resistant characters will continue to grow and reproduce. 

 

Once resistant individuals dominate a population disease control with that product and also products with active ingredients belonging to the same group lose efficacy. In some cases, such as with the strobilurins, efficacy may be completely lost.  This is why products such as Quadris and Headline can no longer be used to control Frogeye Leaf spot in soybeans in many states in the South and Midwest.

I encourage you to follow the labels and ensure that these valuable disease management tools remain effective for years to come.  There are many products available that have excellent efficacy on fungal diseases in Corn and Soybean and these products vary in price.  I suggest selecting a product that fits your budget and can be applied at the labeled rate as opposed to purchasing a more expensive product and cutting the rate to make it fit your budget. 

Ernst Undesser
By Nathan Kleczewski, University of Delaware Extension Plant Pathologist July 14, 2014