Turfmate field notes · Diseases

Pythium root dysfunction

Pythium species associated with the root-dysfunction complex.

Pythium root dysfunction is a specialist problem of creeping-bentgrass greens. Root damage can develop before obvious surface symptoms, then appear as poor growth or drought-like patches when the turf comes under stress. Australian technical guidance describes its resemblance to take-all patch.

Pythium root dysfunction causing brown-red patches that can resemble take-all damage.
Pythium root dysfunction causing brown-red patches that can resemble take-all damage.
Photo: L. Tredway / Syngenta GreenCast · Full photo ↗

What to look for

  • Irregular or rounded patches initially resembling wilt, poor nutrition or uneven growth under stress.
  • Discolouration progressing towards orange or reddish-brown, sometimes followed by a collapse of affected turf.
  • Tan roots with poor root-hair development; sand may fall away more readily from affected roots.

More photos to compare

Compare the overall pattern with the plant detail. Check the grass species and growing conditions as well as the appearance.

Pale brown roots with few root hairs in Pythium root dysfunction.
Pale brown roots with few root hairs in Pythium root dysfunction.
Photo: Syngenta GreenCast · Full photo ↗

Check the grass and site

Primarily creeping bentgrass on intensively maintained putting greens, with younger greens a recognised concern. This is a specialist guide for professional turf managers assessing bentgrass greens.

Confirm it before you treat it

Ask a turf adviser or diagnostic service to examine the roots and distinguish root dysfunction from root rot, take-all and environmental stress. Provide the grass cultivar, green age, symptom history and recent watering or maintenance changes with any submitted photographs or samples.

What to do next

  1. Monitor moisture closely so impaired roots experience neither prolonged saturation nor avoidable drought stress.
  2. Review mowing height and mechanical wear to reduce stress while preserving an appropriate playing surface.
  3. Use soil and tissue information to guide nutrition, and plan aeration or other root-zone work with the turf adviser.
Seasonal watch

Conditions matter more than dates.

Root infection may develop during cooler autumn and spring conditions, with decline becoming more obvious under summer stress. Low fertility, drought and limited soil oxygen can worsen symptoms. A healthy-looking surface earlier in the season does not rule out root injury.

Does a general Pythium diagnosis explain which problem is present?

Ask which form has been identified. Root dysfunction, root rot and leaf blight describe different problems. Clear identification helps the turf manager match care and any further treatment decision to the affected plant tissues.

Compare similar problems

Reviewed 18 October 2026 · Turfmate. Identification guidance is not a laboratory diagnosis or a spray calendar.

Technical sources & image credits

Syngenta photographs are reproduced in full with attribution. Source grass species and settings are identified where supplied; photographs support identification and do not replace diagnosis.

A Turfmate product link does not imply endorsement by a photographer or source.