The most challenging trait of CPB is its uncanny ability to develop rapid resistance to conventional insecticides. CPB can develop rapid resistance due to a variety of mechanisms, including enhanced metabolism, target site insensitivity, reduced insecticide penetration and increased excretion, write
Mark Milenski and Manuel Campos, Entomologist at BioSafe Systems in a recent article published by Potato Country magazine.
Milenski and Campos say many conventional insecticides have shown rapid reduction in efficacy, with different populations in different geographic regions developing known resistance to an estimated 56 conventional insecticides.
A few examples of common chemistries with known CPB resistance include carbamates, organophosphates, synthetic pyrethroids/pyrethrins and neonicotinoids. There also has been evidence of CPB developing behavioral resistance, meaning larvae and/or adults migrate away from treated areas where resistance to an insecticide has been established.
Although there isn’t one cure-all insecticide or 100-percent-suppression program to manage Colorado potato beetle, new and innovative tools and strategies are being developed through the collaboration of university researchers, growers and bio-innovation companies,
Milenski and Campos write.
Some of these new tools are showing promising results when incorporated in IPM programs for CPB. Some products that are gaining traction in the fight against CPB are mycoinsecticides containing the fungus Beauveria bassiana or botanical insect growth regulators made with plant extracts such as azadirachtin.