Green Acres


May 4, 2022

Insecticide-Resistant Alfalfa Weevils Found in Bighorn County

Kevin Wanner (MSU Extension Entomologist) informed Extension that the alfalfa weevil (Hypera postica) has developed resistance to pyrethroid insecticides in Bighorn County. He also put together an article on the subject. Below are a few segments taken from the article. After years of exposure, insect populations develop resistance to insecticide toxins, making them ineffective. Changing the genetic makeup of insect populations can produce alarming and costly consequences when materials are no longer effective.

Pyrethrum, the “...

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