African black beetle & lawn grubs
Heteronychus arator
Confirm root-feeding larvae before choosing grub control.
Photo: kikuyu · source · CC0. Displayed at reduced size; card crops fit the layout.
What to look for
- Thinning or wilting turf may have reduced roots.
- White curl-shaped grubs can be found in the root zone.
- Adult beetles are shiny and dark, but an adult sighting alone does not prove a larval infestation.
Confirm it before you treat it
Cut and lift a small sample at the fresh edge of damage and compare it with healthy turf. Record larvae, root loss and soil moisture. Several scarabs look similar, and drought, disease or billbug damage can also make turf lift easily.
What to do next
- Confirm the pest and feeding stage before buying a treatment.
- Monitor areas with previous damage as spring activity and egg hatch approach.
- Plan root-zone pest management separately from surface-feeding caterpillars; watering directions can differ.
Conditions matter more than dates.
Larval root feeding is the treatment target for an Acelepryn grub program. Local hatch timing and soil conditions determine the useful application window.
Spring monitoring and prevention planning commonly lead into summer grub checks. Northern and warmer sites may need a different timetable.
Do beetles under a light mean I should spray?
No. Inspect the lawn and identify the damaging stage. Adult sightings are a monitoring cue, not proof of enough root-feeding larvae to justify treatment.
Similar problems. Different solutions.
Lawn armyworm
Fast-moving leaf damage: inspect for caterpillars, not just moths.
Identify & find a solution ↗
Black cutworm
Night-feeding caterpillars can damage leaves and young turf.
Identify & find a solution ↗Couch mite
Short, crowded shoots can be a clue in couch turf.
Identify & find a solution ↗Reviewed 10 October 2026 · Turfmate. Seasonal windows are indicative planning guidance, not measured outbreak or prevalence data.
Technical sources & image credits
- Syngenta Australia: lawn grub program
- Liquid Acelepryn Australian product label
- African black beetle & lawn grubs — Photo: kikuyu · source · CC0. Displayed at reduced size; card crops fit the layout.
- Lawn armyworm — Photo: Richard Fuller · source · CC0. Displayed at reduced size; card crops fit the layout.
- Black cutworm — Photo: W. M. Hantsbarger, Bugwood.org · source · CC BY 3.0 US. Displayed at reduced size; card crops fit the layout.
Photos support identification and may have been taken outside Australia. Appearance varies with species, mowing and conditions. A Turfmate product link does not imply endorsement by a photographer or source.