Pest Beetle Control With Natural Solutions

Members of the Coleoptera order, beetles are the largest group of insects with one-fourth of all insects belonging to this group. While there are many beetles beneficial to growers (ladybugs, rove beetles, Cryptolaemus montrouzieri), many can also become pests as they feed on plant matter and mature. Browse the information and products below to find the best beetle control options for your needs.

Life Cycle:

The life cycle of all of beetles starts when a female lays eggs on or around the material that the larvae will consume. Eggs can be laid in the soil, on grain, on leaves, on seeds, or in plants themselves. Larvae feed voraciously once they emerge, often causing damage to foliage and/or roots. Japanese beetle grubs, for example, prefer the roots of grasses making them common pests in turf and lawns. Eventually the larvae pupate and a mature adult beetle emerges ready to eat, mate, and continue the beetle's life cycle. Adult beetle activity is variable depending on availability of food sources; however, feeding damage often results in chewing damage and skeletonization of leaves.

Beetle Control:

Scouting – Beetle control begins with plant inspection. Spotting eggs or larvae early makes control easier to maintain. Trapping adults early in the season can also be helpful in identifying and monitoring pests before they become severe issues.

Preventive Control –

  • Apply Hb NemaSeek nematodes when soil temperatures are above 42°F. They target soil-dwelling grubs (beetle larvae), reducing the numbers of adults in the area.
  • Release Assassin Bugs in the growing area to feed on beetle eggs on foliage. Neem oil sprays can also be applied as a contact killer for any eggs.
Adult Beetle Control –

  • Beauveria bassiana sprays minimize risk to beneficials and provide lasting control once applied. BotaniGard 22WP, Mycotrol WPO and BioCeres WP are three common mycoinsecticides used for adult beetle control.
  • Azera Gardening uses azadirachtin and pyrethrins to kill on contact and through ingestion. This maximizes the effect on all beetle life stages; however, caution must be used during flowering.
  • Bonide Garden Dust can be used to treat foliage and prevent further feeding.
Browse our full list of control options below or find more information on grub control.

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