Includes Polyphylla decemlineata, Plecoma spp., Aphodius spp.
Pest description and crop damage Small to large C-shaped, white scarab beetle larva with six legs and a brown head. Grubs feed on roots, often killing young trees. Many follow the soil moisture and may appear absent in summer.
Some growers have observed partial control from parasitic nematodes, but results are poorly replicated.
To date, chemical control on established large grub populations has not been effective.
- bifenthrin (Brigade, OnyxPro, Sniper and others)-Restricted use pesticide. (Group 3)
- carbaryl (Sevin and others)-(Group 1)
- imidacloprid (Admire Pro, Nuprid 2F)-(Group 4)
- thiamethoxam (Flagship 25 WG)-(Group 4)