Tiny White Worms at Rose of Sharon Base: Identification

Mysterious Insects at Shrub Base: Likely Japanese Beetle Grubs

A Rose of Sharon, transplanted last year to a sunnier spot, showed slow spring growth. Tiny white worms crawling at the base of the trunk were observed—distinct from termites previously encountered.

Probable Identification: Japanese Beetle Grubs

Small white "worms" (C-shaped larvae) at the base of a Rose of Sharon in summer are most likely Japanese beetle grubs. Adults lay eggs in turf/soil near favored plants (roses, grapes, lindens, hibiscus/Rose of Sharon). Grubs feed on roots, potentially causing stress, though they're more damaging to lawns.

Recommended Steps

• Collect specimens in alcohol for positive ID at local Cooperative Extension office.
• Check turf nearby for grub populations (peel back sod).
• If grubs confirmed: Apply beneficial nematodes (Heterorhabditis bacteriophora) to soil in late summer/early fall for biological control.
• Monitor shrub health—fertilize lightly, water deeply to support root recovery.

Other Possibilities

Could be root weevil larvae, cutworms, or other soil-dwelling larvae. Proper ID ensures targeted treatment. Rose of Sharon is generally tough; address any root feeding promptly.