Anthracnose

  • Scientific Name: Colletotrichum spp.

Anthracnose

Causal Agent

Colletotrichum spp.

What is Anthracnose?

Anthracnose is a group of diseases that cause dark, sunken lesions on leaves, stems, flowers, and fruits. Anthracnose infects many deciduous and evergreen trees and shrubs and in some regions also infects fruits, vegetables, and turf grass

What are the Symptoms of Anthracnose?

Turf that succumbs to Anthracnose will see the pathogen infect the stem, crown, upper root tissue and lower foliar tissue, causing dark brown to black discolouration. 

  • Leaves of infected plants turn yellow to a light tan to brown before dying. Younger leaves often turn red.

  • In anthracnose foliar blight, red to brown elongated lesions can appear on leaf blades, enlarging to blight the entire leaf. Blighted leaves turn yellow and begin to die back from the tip

  • Basal stem and leaf sheath rot, affected plants are easy to pull out.

  • Infected areas are seen as irregular-shaped patches, and affected patches are reddish brown colour before yellow then tan to brown.

  • A black stain may occur at the base of infected plants, this is an acervulus, a black fungal fruiting body. It can be seen using a hand lens often growing on the dead or infected tissue.

What causes Anthracnose?

The fungal pathogen most commonly responsible for causing anthracnose diseases in turf is Colletotrichum graminicola. The pathogen can be identified by the presence of distinctive acervuli (fruiting bodies) which appear on infected plant tissue as black hairlike protrusions. These fungi are known to colonise plant tissue on most turf species, infecting crown and root tissue (known as basal rot), or foliage (foliar blight).

When does Anthracnose occur?

In general, the conditions favouring Anthracnose are:

  • Warm and humid conditions - particularly temperatures over 25°C.

  • More than 10 hours a day of leaf wetness for consecutive days.

  • Hot summers in cool temperature areas are when the disease is most noticeable.

  • Soil compaction and low amounts of nitrogen also contribute to disease occurrence.

What turfgrasses are especially susceptible to Anthracnose diseases?

Wintergrass (Poa annua), Bentgrass, Kentucky Bluegrass, Fescue & Couch. Though bentgrass suffers from anthracnose foliar blight, it is not known to become infected with the basal rot which commonly affects P. annua.

What can I do to manage Anthracnose diseases?

Anthracnose will often infect plants in a weakened or stressed state. Management practices that help reduce plant stress can be beneficial:

  • Maintaining adequate nutrition and a balanced fertility level (avoid phosphorus and potassium deficiencies)

  • Proper irrigation (avoid overwatering and underwatering), and regular aeration.

  • Infected turf can often require micromanagement to reduce symptoms, including raising mowing height and reducing mowing frequency

  • Decrease surface traffic. 

  • Core aerate and overseed in autumn but do not core aerate while disease symptoms are present.

  • Convert to less susceptible varieties of turfgrass on fairways.

  • Avoid management practices that encourage humidity and extended leaf wetness.

  • Make preventative fungicide applications where the disease is a chronic problem.

For chemical solutions or treatments for Anthracnose, please see the recommended products below.

PRODUCT SOLUTIONS FOR Anthracnose

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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Maxtima® Fungicide
Active: 400g/l Mefentrifluconazole

Maxtima® is a revolutionary, broad spectrum DMI fungicide that can be applied on any turf, at any temperature and anywhere on your course.

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Captan 800 WG Fungicide
Active: 800g/kg Captan

Captan 800 WG controls a broad spectrum of diseases in turf, ornamentals as well as a range of crops including apples, almonds, grapes, pears, pist...

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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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Patriot Fungicide
Active: 200g/L Tebuconazole, 100g/L Trifloxystrobin

Patriot Fungicide is a broad spectrum fungicide containing 100 g/L of the active ingredient Trifloxystrobin and 200 g/L Tebuconazole.

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Quali-Pro Enclave Fungicide
Active: 365g/L chlorothalonil, 119g/l Iprodione, 119g/l Thiophanate methyl and 36g/L Tebuconazole

Quali-Pro Enclave is registered for the broad spectrum, eradicant, curative and preventative control of Brown Patch, Fusarium Patch, Anthracnose, D...

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Quali-Pro Evolution Fungicide
Active: 200g/L Tebuconazole, 120g/L Azoxystrobin

Evolution Fungicide is a premium, fungicide mixture containing 120 g/L of the active ingredient Azoxystrobin and 200 g/L Tebuconazole.

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Banner Maxx Fungicide
Active: 15.5% Propiconazole

Banner Maxx is early curative treatment, providing systemic broad-spectrum control of Dollar Spot, Winter Fusarium, and the ERI complex (Couchgrass...

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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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Instrata Turf Fungicide
Active: 36.2% Chlorothalonil, 5.7% Propiconazole...

Instrata is an excellent choice for use in a preventative program or curatively after first symptoms are evident.

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Medallion Turf Fungicide
Active: 125g/l Fludioxonil

Medallion Turf Fungicide offers contact plus – exceptional spore busting capabilities on the leaf, in the thatch, and on the soil surface.

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Velista Turf Fungicide
Active: 500 g/kg Penthiopyrad

Velista is a powerful broad spectrum fungicide that can be used all year round and can be trusted to keep your turf in excellent condition especial...

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Dedicate Forte Stressgard Fungicide
Active: 240g/l Tebuconazole

Dedicate FORTE Stressgard® is a broad-spectrum DMI fungicide containing tebuconazole (240 g/L) with Stressgard Formulation Technology, and control...

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Dedicate Turf and Ornamental Fungicide
Active: 100g/L Trifloxystrobin, 200g/L Tebuconazole

Dedicate turf fungicide contains two active ingredients with two different modes of action, providing curative and preventative control. It has a c...

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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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Impala Fungicide
Active: 96g/l Azoxystrobin, 194g/l Triticonazole

Impala is formulated for broad spectrum control of fungal diseases in turf.

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Vantage Fungicide
Active: 95g/L Azoxystrobin

Vantage fungicide is a broad spectrum, systemic fungicide containing 95 g/L of the active constituent Azoxystrobin, a trusted chemistry for Austral...

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Thiram Liquid Fungicide
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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