In the last two weeks, there have been two reported cases of Sugarcane Aphids in fields in Ford County.
One field was near the Bucklin area and the other field was east of Dodge City.
Neither field was to the treatment threshold and some predator insects were found in one field. However, as of Aug. 17, things have changed dramatically.
New detections of sugarcane aphid have been reported this week for Kansas counties: Kearney, Pawnee, Scott, Finney, Comanche, Reno, Barton and Saline.
Several fields in Finney, Ford, Meade, and Pratt have reached threshold levels and have been treated.
However populations reported from the other counties remain low and were found on only a few hot spots within a field. Remember that hot weather can increase SCA numbers rapidly.
These light colored aphids can easily be confused with other aphids and light colored greenbugs and the nymphs can be difficult to differentiate without using magnification.
Timing effective treatment to control sugarcane aphids in sorghum depends upon the size of the SCA populations and the growth stage of the plants.
K-State is recommending that the economic threshold is 20 percent of pre-boot plants infested with established colonies (>100 aphids), or 30 percent of plants infested post-boot.
Treatment options are either Transform (one ounce per acre) or Sivanto (four ounce per acre).
For earlier stage plants, Sivanto will provide a longer period of protection, but is about 40 percent more expensive.
For plants that have headed out, Transform will be a more economic option, as a long period of residual activity will be less important, and it is also safer for the beneficial species.
For a list of products and labels, visit the myFields.infoInsecticide Selector.
Do not mix these products with any organophosphates or pyrethroids or any combinations thereof – it will actually reduce their efficacy.
If there is a need to control headworms, these products can be mixed with either Prevathon or Blackhawk, but nothing else.
For more information on sugarcane aphids, contact the Ford County Extension Office or go online at myfields.info/pests/sugarcane-aphid.