The Latest

Events

  1. Kansas: K-State Program to Help Farmers Deal with Historic Ag Downturn

    December 7, 2016 @ 8:00 am - February 15, 2017 @ 5:00 pm
  2. Louisiana: LSU Rice Clinics Scheduled Jan. 5 to Feb. 8 in 6 Locations

    December 20, 2016 @ 8:00 am - February 9, 2017 @ 5:00 pm
  3. South Carolina: 4 Upcoming Forest Management Workshops for Woodland Owners

    January 12 @ 8:00 am - February 10 @ 5:00 pm
  4. Minnesota: Weed Resistance Workshops for Jan., Feb.

    January 13 @ 8:00 am - February 24 @ 5:00 pm
  5. Louisiana: LSU Offers 3 Irrigation Workshops in Jan., Feb.

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

    January 18 @ 8:00 am - February 15 @ 5:00 pm
  7. Georgia Ag Forecast Series Scheduled Jan. 18-27

    January 18 @ 8:00 am - January 27 @ 5:00 pm
  8. Texas: Pecan Short Course, College Station, Jan 23-26

    January 23 @ 8:00 am - January 26 @ 5:00 pm
  9. Missouri: 9 ‘Grow Your Farm’ Sessions from Jan. – March

    January 23 @ 8:00 am - March 11 @ 5:00 pm
  10. Texas: Red River Crops Conference, Childress Jan. 24-25

    January 24 @ 8:00 am - January 25 @ 5:00 pm
  11. South Carolina: Cotton, Peanut Grower Meetings, Sentee, Jan. 24, 26

    January 24 @ 8:00 am - January 26 @ 5:00 pm
  12. Missouri: 4 Farm Retirement, Succession, Estate Planning Workshops in Jan., Feb.

    January 24 @ 8:00 am - February 14 @ 5:00 pm
  13. Arkansas Soil & Water Education Conference, Jonesboro, Jan. 25

    January 25 @ 8:00 am - 5:00 pm
  14. Georgia: Cotton Production Workshop, Tifton, Jan. 25

    January 25 @ 8:00 am - 5:00 pm
  15. Texas: Feed Grains Marketing Workshop, Amarillo, Jan. 25-26

    January 25 @ 8:00 am - January 26 @ 5:00 pm
  16. Virginia Eastern Shore Ag Conference and Trade Show, Melfa, Jan. 25-27

    January 25 @ 8:00 am - January 27 @ 5:00 pm
  17. Louisiana: Conservation Program Workshop, West Monroe, Jan. 25

    January 25 @ 8:00 am - 5:00 pm
  18. Middle Tennessee Grain Conference, Manchester, Jan. 26

    January 26 @ 8:00 am - 5:00 pm
  19. Texas: Pesticide Applicator Course, Harleton, Jan. 26

    January 26 @ 8:00 am - 5:00 pm
  20. Texas: Feral Hog Program, Falfurrias, Jan. 26

    January 26 @ 8:00 am - 5:00 pm
  21. Nebraska Livestock: 8 Nutrient Management Workshops in Jan. and Feb.

    January 26 @ 8:00 am - February 7 @ 5:00 pm
  22. Rice Industry: Upcoming Meetings in MS, AR, LA, in Jan., Feb.

    January 26 @ 8:00 am - February 8 @ 5:00 pm
  23. Texas: Llano Estacado Cotton Conference, Muleshoe, Jan. 30

    January 30 @ 8:00 am - 5:00 pm
  24. Texas: Feral Hog Management Workshop, La Vernia, Jan. 30

    January 30 @ 8:00 am - 5:00 pm
  25. Alabama: Upcoming Crop Production Meetings, Jan. 30, Feb. 7

    January 30 @ 8:00 am - February 7 @ 5:00 pm
  26. Indiana: Ag Business Management Workshop, West Lafayette, Jan. 31 – Feb. 2

    January 31 @ 8:00 am - February 2 @ 5:00 pm
  27. Texas: ‘Last Chance’ CEU Training, San Angelo, Jan. 31

    January 31 @ 8:00 am - 5:00 pm
  28. California: Farm Labor Management Workshops Scheduled in February

    February 1 @ 8:00 am - February 2 @ 5:00 pm
  29. Tennessee: Grain & Soybean Producers Conference, Dyersburg, Feb. 2

    February 2 @ 8:00 am - 5:00 pm
  30. Texas: Grain Elevator Workshop, Amarillo, Feb. 2

    February 2 @ 8:00 am - 5:00 pm

Georgia Sorghum: Be Prepared for More Sugarcane Aphids in 2016

Debra Ferguson
By Sharon Dowdy University of Georgia, College of Agricultural and Environmental Sciences February 21, 2016

Georgia Sorghum: Be Prepared for More Sugarcane Aphids in 2016

Sugarcane aphid nymphs and an adult on a grain sorghum leaf. (Texas A&M AgriLife Extension Service photo by Dr. Pat Porter)

Sugarcane aphids began infesting Georgia sorghum fields two years ago. In 2015, the pest devastated farmers who chose not to apply spray controls.

“Farmers who didn’t spray last year didn’t harvest a yield, and others had to spray three to four times,” said David Buntin, a UGA College of Agricultural and Environmental Sciences researcher based on the university’s campus in Griffin, Georgia.

 

Similar in appearance to the yellow sugarcane aphid, Buntin describes the pest as medium to pale yellow with black feet, black antennae and two black “tail pipes.” The adult aphid has black stripes on the wings, making it very distinctive.

The pest was discovered in the United States near Beaumont, Texas. In 2013, it was found in four states and 38 countries. By 2015, sugarcane aphids were found in 17 states.


In 2013, the insect shifted from its preferred host, sugarcane, to sorghum. “They’ll attack anything that has sorghum in the name, and Johnsongrass is their main alternative host,” Buntin said. The pest does not like wheat, oats, barley, rye, switchgrass or cool-season grasses.

“All the females are born pregnant, and they have a very high reproduction rate. The good news is that they don’t overwinter in Georgia, and they are not known to transmit any viruses,” Buntin said. “They like it hot and dry.”

Sugarcane aphids colonize on the undersides of leaves. Generally, by the time a farmer notices the pest, “the damage has been done,” Buntin said. Left untreated, the pest will reduce or prevent the plant’s head from emerging.

In addition to destroying a farmer’s crop, they also cause annoying damage. “They create a lot of sticky honeydew that can really make a mess of harvesting equipment,” he said.

The sugarcane aphid’s natural enemies include a host of lady beetles, hoverflies, green lacewings and a parasitoid.

Studying the pest in research plots on UGA CAES research farms, Buntin determined farmers should apply pesticides as control when 50 or more aphids are found on 25 percent of the crop. “Doing this during preboot or boot stage is critical to control damage,” he said. (“Boot” is when the seed head is developing, but is still inside the stem and has not emerged. “Preboot” is the vegetative stage before the seed head is present in the boot.)

Several insecticide seed treatments are available, all of which are equally effective for controlling the pest in the first 30 days. By 51 days, Buntin said, the treatment has dissipated.

In partnership with UGA Cooperative Extension entomologist Phillip Roberts, Buntin conducted trials using a variety of chemical treatments. The untreated grain sorghum plots did not produce heads as a result of the aphid damage. The best control method was determined to be Sivanto 200 SL at 4 to 7 fluid ounces per acre. Transform WG at 1 to 1.5 ounces also was effective.

Transform was used in Georgia in 2015 under an emergency use exemption to Section 18, which has expired, Buntin said. A new Section 18 exemption will be needed for 2016.

“Pyrethroid-type insecticides are not effective against the aphid. They will flare aphid populations, but kill the predators and parasitoids,” he said.

Buntin says planting treated seeds are sugarcane farmers’ first line of defense.

“I would suggest, once the seed treatment plays out, that farmers apply Sivanto and follow with Transform. Aerial applications need to be in the 5-gallon range. Coverage is critical, and you need to get the spray down into the canopy,” he said.

Buntin reminds farmers that no insecticides are labeled for use on sweet sorghum, which is used for making sorghum syrup.

“It’s going to be a tough year for sorghum, especially the forage and silage types,” said Buntin, who conducts research on all small grains grown in Georgia. “Farmers should try to suppress the aphids before the crop gets too big and should remember to spray with a ground sprayer.”

Debra Ferguson
By Sharon Dowdy University of Georgia, College of Agricultural and Environmental Sciences February 21, 2016