Drechslera - Nuturf

Causal Agent: Drechslera spp.

Susceptible Turfgrasses: Cool season turfgrasses.

Symptoms

Small, water-soaked lesions may initially appear in infected foliage.
Lesions may then become dark reddish purple to brown in colour with a yellow chlorotic margin.
Deepening of lesions occurs until lesions become pitted and ulcerous in appearance, resulting in the angled collapse of infected leaf blades.
Lesions are generally ovular to oblong in shape, running parallel to the leaf blade or rhizome and as they enlarge they may coalesce to blight entire leaves.
Patchy blighted areas of turf may result in melting out of large areas, where turf becomes thin and unthrifty.
Crown and root rot may also occur resulting in wilting and chlorosis.

Conditions Favouring Disease

Drechslera is active year round with a temperature range for conidia germination of 3-27°C and an optimum temperature of 15-18°C.
The pathogen has survival mechanisms allowing it to persist through temperature extremes of hot and cold.
Cool wet conditions are most favourable for leaf spot symptoms to occur.
Moisture on the leaf surface is necessary for infection to occur.
Poor air movement (high humidity in the micro-climate).
Excessive nitrogen fertiliser.
Excessive thatch and loose leaf clippings provide a source of food for the fungus.
Any stress situation such as drought, herbicide injury or heavy traffic can increase the severity of the disease.

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Products to Use Drechslera

Vantage Fungicide

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

Bayfidan is a broad spectrum, systemic foliar fungicide that is rapidly taken up by plants and translocated within the plant. Bayfidan…

Patchwork is a broad spectrum fungicide containing 250 g/L of the active ingredient Triadimenol. It is specifically registered for the control…

Impala is formulated for broad spectrum control of fungal diseases in turf. The new active constituent triticonazole brings higher efficacy from…

Fore Rainshield is a broad spectrum protectant fungicide containing 480g/L of the active ingredient Mancozeb formulation offers superior spreading and sticking…

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

Chloronil Pro Fungicide is a broad spectrum, contact or protectant fungicide for the control of a range of diseases fruit, vegetables…

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

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

Headway Maxx combines the strength, longevity and broad spectrum of Heritage MAXX with the speed and early curative action of Banner…

Daconil Weather Stik is a contact fungicide that can be used in preventative programs. It can be used as an early…

Banner Maxx is an excellent choice as an early curative treatment, providing systemic broad spectrum control of major turf diseases including…

Causal Agent: Drechslera spp.

Susceptible Turfgrasses: Cool season turfgrasses.

Symptoms

Small, water-soaked lesions may initially appear in infected foliage.

Lesions may then become dark reddish purple to brown in colour with a yellow chlorotic margin.

Deepening of lesions occurs until lesions become pitted and ulcerous in appearance, resulting in the angled collapse of infected leaf blades.

Lesions are generally ovular to oblong in shape, running parallel to the leaf blade or rhizome and as they enlarge they may coalesce to blight entire leaves.

Patchy blighted areas of turf may result in melting out of large areas, where turf becomes thin and unthrifty.

Crown and root rot may also occur resulting in wilting and chlorosis.

Conditions Favouring Disease

Drechslera is active year round with a temperature range for conidia germination of 3-27°C and an optimum temperature of 15-18°C.

The pathogen has survival mechanisms allowing it to persist through temperature extremes of hot and cold.

Cool wet conditions are most favourable for leaf spot symptoms to occur.

Moisture on the leaf surface is necessary for infection to occur.

Poor air movement (high humidity in the micro-climate).

Excessive nitrogen fertiliser.

Excessive thatch and loose leaf clippings provide a source of food for the fungus.

Any stress situation such as drought, herbicide injury or heavy traffic can increase the severity of the disease.

Click to Download

Products to Use Drechslera