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  1. Texas: Small Acreage Farm Equipment Field Day, Cameron, April 30

    April 30 @ 8:00 am - 5:00 pm
  2. Texas: 2 Grain Grading Workshops, Amarillo, May 3-4

    May 3 @ 8:00 am - May 4 @ 5:00 pm
  3. Texas: Spring Field Day, Chillicothe, May 4

    May 4 @ 8:00 am - 5:00 pm
  4. Texas: Annual Concho, McCulloch County Wheat Tour, Millersview, May 5

    May 5 @ 8:00 am - 5:00 pm
  5. Texas: Private Pesticide Applicators Training, Menard, May 5

    May 5 @ 8:00 am - 5:00 pm
  6. Texas: Private Pesticide Applicator Training, San Angelo, May 6

    May 6 @ 8:00 am - 5:00 pm
  7. California: Almond Workshops Scheduled May 10-12

    May 10 @ 8:00 am - May 12 @ 5:00 pm
  8. Kentucky: Wheat Field Day, Princeton, May 10

    May 10 @ 8:00 am - 5:00 pm
  9. Texas: Multi-County Ag Chemical Collection Event, Kenedy, May 11

    May 11 @ 8:00 am - 5:00 pm
  10. Texas: Private Pesticide Applicator Training, Floresville, May 16

    May 16 @ 8:00 am - 5:00 pm
  11. Texas: Ag Forum, Austin, May 16

    May 16 @ 8:00 am - 5:00 pm
  12. Kansas: Wheat In-Depth Diagnostic School, Colby, May 17-18

    May 17 @ 8:00 am - May 18 @ 5:00 pm
  13. North Carolina: Pesticide Disposal Day, Washington, May 18

    May 18 @ 8:00 am - 5:00 pm
  14. Texas: Land, Water, and Wealth Symposium, Lufkin, May 20

    May 20 @ 8:00 am - 5:00 pm
  15. Georgia: Pest Manager Training, Valdosta, May 27

    May 27 @ 8:00 am - 5:00 pm
  16. Tennessee: Weed Tour, Jackson, June 22

    June 22 @ 8:00 am - 5:00 pm
  17. Southern Peanut Growers Conference, Miramar Beach, FL, July 21-23

    July 21 @ 8:00 am - July 23 @ 5:00 pm
  18. Illinois: Agronomy Day, Savoy, August 18

    August 18 @ 8:00 am - 5:00 pm

Georgia Pecans: Nickel and Phosphite Help Fight Pecan Scab

Ernst Undesser
By Sharon Durham, USDA Public Affairs Specialist August 20, 2013

Georgia Pecans: Nickel and Phosphite Help Fight Pecan Scab

Adding nickel and phosphite to an existing fungicide spray regimen may help growers thwart pecan scab, a scourge to pecan growers in Georgia, according to U.S. Department of Agriculture (USDA) scientists.

Pecan scab, caused by the fungus Fusicladium effusum, is the most destructive disease of pecan in the southeastern United States. When scab is severe—most often due to above-average rainfall—it reduces nut size and can even wipe out a season’s crop.

        
         

Scientists at the Agricultural Research Service (ARS) Southeastern Fruit and Tree Nut Research Laboratory in Byron, Ga., are helping pecan growers mitigate the effect of pecan scab. Research leader Bruce Wood, plant pathologists Clive Bock and Michael Hotchkiss, and entomologist Ted Cottrell are using nickel and phosphite treatments and other approaches to reduce scab’s impact.

ARS is USDA’s chief intramural scientific research agency, and this research supports the USDA priority of promoting international food security.

Wood and his colleagues determined that spraying canopies with nickel not only improves tree health and increases tree resistance to scab, but also imparts a beneficial side effect of reducing growth and proliferation of the fungus. They found that combining nickel as a nutritional supplement with fungicides and applying them as air-blast sprays helped reduce losses in commercial orchards.

Bock and his colleagues found that phosphite controlled pecan scab on both foliage and fruit early in the growing season. It also reduced disease on mature pecans, but not as well as an industry standard fungicide, triphenyltin hydroxide. However, scab on fruit late in the season is cosmetic and was previously shown by ARS scientists to have no effect on nut quality or yield.

In field tests, phosphite was directly toxic to the pecan scab fungus at concentrations similar to those in the lab. Phosphite provides an alternative chemistry for growers to consider, according to Bock. This is particularly useful because the scab fungus has developed resistance to some fungicides currently used for control.

Ernst Undesser
By Sharon Durham, USDA Public Affairs Specialist August 20, 2013