Pythium Root Dysfunction

  • Scientific Name: Pythium spp.

Pythium Root Dysfunction

Causal Agent

Pythium spp.

What is Pythium Root Dysfunction?

Pythium root dysfunction is a fungal disease caused by Pythium spp. that infects grass roots and inhibits their ability to absorb water and nutrients from the soil. When turf is affected, it may appear thin, off-colour and slow growing. In cool and wet conditions, Pythium root dysfunction may first appear as small, diffuse, yellow patches of turf 4-7cm in diameter.

What are the symptoms of Pythium Root Dysfuncton?

General symptoms of pythium root dysfunction include:

  • Affected turf may appear thin, off colour and slow growing. This may occur in small patches or as a general decline and loss of large turfgrass area.

  • Under cool, wet conditions symptoms may first appear as small, diffuse yellow patches of turf 4 to 7cm in diameter.

  • As temperatures rise, large areas of turf may wilt, turn brown and die.

  • In severely infected plants, crowns may appear watersoaked and root systems are greatly reduced in volume and vigour.

  • Roots and crown may be extensively discoloured.

  • No foliar mycelium is evident during infection.

What turfgrasses are particuarly susceptible to Pythium Root Dysfunction? 

Cool and warm season grasses.

When does Pythium Root Dysfunction occur?

The general conditions favouring Pythium Root Dysfunction are:

  • Hot days (30-35°C), humid or rainy weather when night temperatures are warm (above 20°C).

  • Relative humidity exceeding 90% for at least 14 hours and a minimum temperature not falling below 20°C.

  • Pythium Root Dysfunction occurs in areas with high soil moisture, poor drainage and low light.

  • Areas with low mowing height and excessive wear.

What can I do to manage or control Pythium Root Dysfunction?

Management practices that can help control or reduce instances of pythium root dysfunction include:

  • Water early in the day, and water infrequently and deeply.

  • Removal of excessive thatch.

  • Do not over fertiliser turf with nitrogen.

  • Avoid mowing during moist, hot weather.

  • Promote good light penetration into the turf canopy.

  • Increase air circulation to speed the drying process of the turf.

For chemical solutions and treatments for Pythium Leaf Dysfunction, please see the recommended products below.

PRODUCT SOLUTIONS FOR Pythium Root Dysfunction

Lexicon Intrinsic Fungicide
Active: 167g/L fluxapyroxad, 333g/L pyraclostrobin

Lexicon delivers peak performance under pressure, optimising disease control and providing plants with longer, stronger roots and increased growth....

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Quali-Pro Compass Fungicide
Active: 500g/L fluazinam

Compass Fungicide is a premium, unique, multi-site contact, protectant fungicide, the only registered fungicide for turf in FRAC group 29.

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Magellan 800WG Fungicide
Active: 800g/kg Fosetyl-aluminium

Magellan Fungicide is a targeted oomycete fungicide for the prevention and control of Phytophthora rots in ornamentals and Pythium in turf as speci...

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Headway Maxx Fungicide
Active: 62g/l Azoxystrobin, 104g/l Propiconazole

Headway Maxx combines the strength, longevity and broad spectrum of Heritage Maxx with the speed and early curative action of Banner Maxx in an unb...

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Heritage Maxx Fungicide
Active: 95g/l Azoxystrobin

Heritage Maxx combines systemic activity through xylem mobility, and translaminar movement to encourage multi-site uptake...

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Subdue Maxx Fungicide
Active: 240g/L Metalaxyl-M

Subdue Maxx is a systemic and residual fungicide providing up to 21 days control, making it ideal for the control of Pythium Root and Crown Rot in ...

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Banol Fungicide
Active: 600g/L Propamocarb

Banol Systemic Fungicide is one of the most reliable and proven fungicides for Pythium control.

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Signature Xtra Stressgard Fungicide
Active: 600g/kg Fosetyl-Aluminium

Signature Xtra Stressgard is a true systemic fungicide that controls tough turf diseases – pythium and anthracnose, as well as enhancing turf hea...

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Segway 400SC Fungicide
Active: 400g/L cyazofamid

Segway 400SC fungicide from ISK Biosciences is a revolutionary new fungicide, providing Australian turf managers with a reliable new tool in the fi...

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Mayfair Fungicide
Active: 240g/L metalaxyl-M

Mayfair Fungicide is a Liquid ME (Micro Emulsion) formulation that contains 240 g/L metalaxyl-M, for the control of Pythium in turf.. Mayfair ...

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Nobility Systemic Fungicide
Active: 800g/kg fosetyl-aluminium

Nobility Systemic Fungicide should be used preventively for the control of Pythium diseases in turf. Nobility Systemic Fungicide is ...

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$203.50
Thiram Liquid Fungicide
Active: 600g/L Thiram

Thiram Liquid Fungicide is a liquid suspension used as a foliar protectant and a seed treatment. Thiram Liquid Fungicide offers a contr...
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Quali-Pro Evolution Advanced Fungicide
Active: 200g/L Tebuconazole, 120g/L Azoxystrobin

Quali-Pro® Evolution® Advance is a premium broad-spectrum fungicide containing 370 g/L Tebuconazole and 222 g/L Azoxystrobin. Building on the str...

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Azoxy 250 T&O Fungicide
Active: 250g/L Azoxystrobin

Azoxy 250 T&O Fungicide (active constituent Azoxystrobin) is an effective xylem systemic fungicide that delivers excellent protection for ...

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