Grub & Beetle Control

Natural Solutions for Killing Grubs & Beetles

Beetle Grubs In Soil – Immature Larvae of BeetlesThe adults of white grubs are commonly the Japanese Beetle, May/June beetle or a type of chafer. The larva, which is "C"-shaped with a white body and tan or brown head, damages lawns and gardens by feeding on grass roots. The adult beetles feed on over 275 plant species including roses, ornamentals, deciduous fruit trees, vegetables, grasses, and weeds.

A fully-grown larva is roughly the size of your little finger. White grubs overwinter as larvae and are ready to start feeding on roots as the soil warms up in the spring. Depending on the species, a life cycle may require one, two, or more years. Damage results both from larvae feeding on roots as well as the attraction of moles to the larvae.

Controlling Grubs - Larvae Control

  1. Apply NemaSeek early in the season. These beneficial nematodes seek out and kill grubs in the soil.
  2. If you live in a region with Japanese Beetles (click for map), treat soil with Milky Spore Powder or Milky Spore Granules in either the spring or the fall. The nematodes help distribute the spores. Combining Milky Spore applications with nematodes is the most effective control for Japanese Beetles.
  3. Treat again with NemaSeek beneficial nematodes six months after your first application to supplement the existing nematode population.

Adult Beetle Control

ARBICO Organics provides pest control solutions for small-scale gardeners as well as larger commercial growing operations. Pyrethrin sprays are the best organic insecticide treatment for Japanese Beetles.

Milky Spore Powder Japanese Beetle ControlSmall Areas and Garden Beetle Control:

  • Beauveria bassiana spores infect and kill grubs and adult beetles. BotaniGard and Mycotrol are both effective treatments. Use on foliage and as a soil drench.
  • Use Azadirachtin sprays to limit beetle feeding and kill on contact. Neem Oil can be used, but is less effective controlling adult beetles.
  • Keep in mind that neem can damage plants that are herbaceous or sensitive. Consider using a Pyrethrin spray (Take Down Garden Spray) in those cases.

Large Area Beetle Control:

  • Use PyGanic Gardening, a pyrethrin concentrate effective against hundreds of insects, including beetles.
  • Apply repellents like Garlic Barrier AG+ to keep adult beetles away. This limits feeding damage and egg laying, but should not be relied upon for control.
  • Orchards and farms benefit from spraying Surround WP (kaolin clay) onto fruit once it sets.

Related Information: Japanese Beetles - Beetle Mania.

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