The treatment threshold level to begin spraying sugarcane aphids in sorghum has been lowered in the Texas High Plains to improve control.
The aphids have been identified recently in Castro, Carson, Deaf Smith, Donley, Gray, Hansford, Moore, Ochiltree, Oldham, Randall and Wheeler counties.
Texas AgriLife Extension entomologist Pat Porter says the recent population discovery indicates producers may need to take a more aggressive approach to control.
“We are finding that our current insecticide regime is not working quite as well as it has in more southern locations with higher humidity and less intense sunlight.”
While there is some speculation as to what is causing the reduced control, at this point, Porter said they aren’t sure. “However, we want to make it absolutely clear that there is no reason to think this is an insecticide resistance issue,” he said.
“Our recommendation now is to apply insecticide when 30 percent of the plants are infested and there are localized areas of heavy honeydew and established aphid colonies.”