Alfalfa weevil populations are high this spring and treatments don't seem as effective as in past years, according to a Kansas State University entomologist.
Jeff Whitworth of K-State Research and Extension, said infestations are causing concern in south central, southwest and north central Kansas. "This is the largest population of weevils that I've seen in at least 10 to 12 years in Kansas."
He said inconsistent insecticide results have sparked talk among some producers of insecticide resistance. But a massive infestation combined with variable weather may be the culprit, he said.