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Pythium spp

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:34 pm No Comments

Damping off

Patches 5 – 7.5 cm dia

Red – yellow colour

Festuca, Agrostis & Poa affected

Too higher rate of sowing/m²

Poor surface drainage

Trace element deficiency

Sown in too early/late when night temperatures are low

Fusarium spp, Pythium spp, Helminthosporium spp.

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Gaeumanomyces graminis

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:32 pm No Comments

Take-all

Fungal attack of roots

Rings 0.1 – 1m dia

Mainly Bent grasses affected

Summer/Autumn

Water logged soils

Sudden rise in pH

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Cristella confinis

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:31 pm No Comments

Thatch fungus

Feeds upon thatch layer

Develops from small patches to areas of 25-30cm

Area infected becomes slightly depressed

All grasses affected

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Lycoperdon spp

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:29 pm No Comments

Type 2 Fairy Ring

Basidiomycete fungi

Stimulated growth due to release of surplus N

Often camouflaged with extra fertilizer

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Marasmius oreades

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:28 pm No Comments

Type 1 Fairy Ring

Basidiomycete fungi

Feeds on soil organic matter, as little as 3% soil OM

Does NOT DIRECTLY kill the grass plant

Kills grass by inducing hydrophobic conditions

Stimulated grass growth, result of release of surplus N

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Myxomycetes spp

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:27 pm No Comments

Slime mould

All grasses affected

Jelly like in appearance

Green – Black in colour

Becomes crusty when dry

Easily crushed, which releases plasmodia, thus spreading the fungus

Poor surface drainage

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Puccinia spp, Uromyces spp

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:25 pm No Comments

Rust

Poa pratensis, Lolium perenne

Cold weather periods in summer & autumn

Yellow/orange appearance with large orange ‘Pustules’ these release uredospores

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Laetisaria fuciformas

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:24 pm No Comments

Red Thread

Festuca rubra, Lolium perenne

Insufficient available nutrient during periods of active growth

Bleached grass

Pink mycelium visible

Red mycelium needles on leaf

Application of a balanced quick release fertilizer will normally resolve this problem. Balance (4:1:3 ratio)

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Drechslera poae

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:23 pm No Comments

Leaf Spot/Melting Out

Poa pratensis

Late summer

Browning & gradual death of plant

Leaf spots have a pale centre with brown or purple margins

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Brown Patch

Posted in Disease Identification Guide on Monday, January 31st, 2011 at 5:22 pm No Comments

Rhizoctonia solani

Circular brown patches up to 3 feet in diameter, with a greyish-black halo when dew is present.

Bents and Annual Meadow Grass

Excess nitrogen during warm spells. Too much water leading to lack of air.

Avoid excess nitrogen and over watering.

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  • Brown Patch
  • Brown Patch
  • Brown Patch
  • Brown Patch