It's August, and if you grow sorghum on the Texas Plains, Sorghum Checkoff Agronomist Brent Bean, says it's time to scout fields for sugarcane aphids.
"Sugarcane aphids (SCA) have spread rapidly over the last 10 days and can now be found as far north as Wichita, Kansas. In most instances, SCA are well below threshold and it takes some looking to find them," Bean said in a recent e-mail.
In the southern areas, SCA may be reaching threshold levels, he warned. "So be scouting fields at least twice a week."
Thresholds differ slightly region-by-region and depending on the various sorghum stages, Bean said. An insecticide application should be made once 50 aphids are present, or a colony the size of a nickel, on a leaf of 25% to 30% of the plants.
"Scout numerous areas in a field," he added. "Although SCA was not much of a problem in South Texas this year, I do know in a few fields an insecticide application was needed prior to harvest."
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Threshold and treatment
Forage sorghum and sugarcane aphids
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