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.
Management-biological control
Some growers have observed partial control from parasitic nematodes, but results are poorly replicated.
Management-chemical control
To date, chemical control on established large grub populations has not been effective.
- bifenthrin (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)