Metarhizium for wireworms
Documented because the fungus is often named as a wireworm biocontrol, not because it is a proven one. Neither US LALGUARD M52 label lists wireworms, and Utah State Extension says no effective biological insecticides are known for them. Metarhizium brunneum does infect them, and some European field trials cut damage to potatoes and maize, but a 2023 study describes field success as inconsistent. A Canadian study found latent infections in field-caught wireworms and suggested that bacteria they carry may suppress the disease. Laboratory work with a wild isolate found no significant infection at 54 °F (12 °C) or colder, and Utah State notes wireworm damage is often worst in cool, wet springs.
Before you order
Spores of an insect-killing soil fungus, sold as granules to mix into potting media and soil, or as a liquid to drench or spray. Labelled for thrips pupae and vine weevil larvae in soil, and for whiteflies, mites and aphids on leaves. It is not labelled for wireworms in the US. How it works, how to tell it has established and the supplier list are on the full Metarhizium brunneum strain F52 profile.
Other controls for wireworms & click beetles
No other reviewed control is listed for this pest yet.