Dollar Spot disease is caused by a fungus that overwinters as sclerotia and as a dormant mycelium in the crowns and roots of infected plants. Turf that is infected with dollar spot will commonly show small, sunken, circular patches about 1.5cm to 5cm in diameter.
Soil pH has little or no effect on Dollar Spot severity.
What are the symptoms of Dollar Spot disease?
Symptoms of dollar spot disease include:
Small, sunken, circular patches 1.5 to 5cm in diameter which appear bleached out
The patches turn from brown to straw colour and may coalesce, into larger irregularly shaped areas.
In the presence of dew, mycelium may be seen as a fine white cottony thread.
Infected leaves may show small lesions that turn from yellow-green to straw colour with a reddish-brown border. These lesions can extend the full width of the leaf.
Multiple lesions may occur on a single leaf blade.
More recent information suggests that Dollar Spot is now caused by species of Lanzia and Moellerodiscus fungi. The causal pathogen of Dollar Spot was formerly known as Sclerotinia homoeocarpa. Microscopic identification of Dollar Spot is undertaken via its distinctive granulated hyphae which appear after a period of incubation.
What turfgrasses are especially susceptible to Dollar Spot disease?
All turfgrass species, predominantly cool season grasses.
The most susceptible grass is – Crenshaw, SR1020.
Bentgrass – Pennlinks, A1 & A4, Providence, L-93 and Penn G2 have shown superior tolerance
When does Dollar Spot occur?
Conditions that are particularly favourable for Dollar Spot disease include:
Temperature range of 16°C to 28°C and continuous high humidity above 85%.
Warm humid weather with cool nights that produce heavy dews.
When the micro-climate temperature reaches 16°C the fungus resumes growth.
Low nitrogen levels.
More severe in dry soils.
What can I do to manage or control Dollar Spot Disease?
Recover from dollar severe cases of dollar spot can be extremely slow. To control and reduce instances of dollar spot, we recommend the following management practices:
Preventative fungicide spray program.
Provide adequate level of nitrogen, particularly in the spring and early summer.
Mow grass at regular intervals.
Reduce thatch.
Increase the air circulation.
Irrigate turf deeply and as infrequently as possible to avoid drought stress.
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 especially when high temperatures and high humidity hit your facility.
Exteris Stressgard Fungicide provides outstanding broad-spectrum disease control, turf quality and application flexibility. Contains a unique SDHI active ingredient as well as new Leaf-Cote technology to improve spray droplet coverage and retention, as well as reduce dry time on the leaf.
Xzemplar™ is a turf fungicide offering advanced systemic movement of the active ingredient, Fluxapyroxad. Xzemplar combines a quick knockdown and powerful, long lasting control.
Bumper 625 EC is a broad spectrum fungicide specifically registered for the control of Spring Dead Spot and Dollar Spot in a range of turf management situations.
Quali-Pro Enclave is registered for the broad spectrum, eradicant, curative and preventative control of Brown Patch, Fusarium Patch, Anthracnose, Dollar Spot, Helminthosporium, Grey Leaf Spot and Spring Dead Spot in all recreational turf management situations.
Banner Maxx is early curative treatment, providing systemic broad-spectrum control of Dollar Spot, Winter Fusarium, and the ERI complex (Couchgrass Decline and Take-all Patch).
Daconil Weather Stik is a contact fungicide that can be used in preventative programs. It can be used as an early curative after the first signs of disease become evident.
Headway Maxx combines the strength, longevity and broad spectrum of Heritage Maxx with the speed and early curative action of Banner Maxx in an unbeatable combination.
Dedicate FORTE Stressgard® is a broad-spectrum DMI fungicide containing tebuconazole (240 g/L) with Stressgard Formulation Technology, and controls tough soil-borne and foliar fungal diseases in both cool and warm season turfgrass.
Dedicate turf fungicide contains two active ingredients with two different modes of action, providing curative and preventative control. It has a contact and systemic action in turf which provides broad spectrum control.
Interface with Stressgard Formulation Technology offers the new standard in turf protection and is Bayer’s most powerful turf fungicide to-date. It manages disease stress leading to improved turf quality and playability.
Patchwork is a broad spectrum fungicide containing 250 g/L of the active ingredient Triadimenol. It is specifically registered for the control of Dollar Spot, Black Helminthosporium, Take All Patch and Winter Fusarium in all recreational turf situations.
Shiba fungicide is a liquid suspendable concentrate of Tolclofos methyl 500g/L, and has been specifically registered for the treatment of Brown Patch and Dollar Spot.
Chipco GT is a broad-spectrum fungicide providing unsurpassed control of brown patch, dollar spot, various leafspots, and a variety of other turf diseases.
Banner Fairway is a fungicide registered for the control of control of Spring Dead Spot in Couch and Dollar Spot in Bent Grass and Queensland Blue Couch.
Midas turf fungicide is effective against all strains of dollar spot, including those resistant to other chemistry classes making it the ultimate solution for effective, long-term dollar spot control.
For systemic control of ring spot on cabbage, cauliflower and broccoli, powdery mildew on cucurbits, tomatoes, grapevines, parsnip, radish, swede, turnips and papaws, pineapple disease of sugar cane, Myrtle rust in Riberries, lemon myrtle, anise myrtle, nursery stock (non-food and forestry), non-bearing fruit trees, ornamentals, cut flowers/foliage and oil tea tree, and various diseases of turf as indicated in the directions for use table.
Transact 500 is a broad spectrum fungicide containing 500 g/L of the active constituent Iprodione. It is registered for the control of Brown Patch, Dollar Spot, Fusarium Patch, Spring Dead Spot, Curvularia and Helminthosporium disease in all recreational turf situations. It is also registered for the control of Botrytis Blight in ornamental plant applications.
Chloronil Pro Fungicide is a broad spectrum, contact or protectant fungicide for the control of a range of diseases fruit, vegetables and turf. It is registered for the control of Brown Patch, Dollar Spot and Grey Leaf Spot in all recreational turf situations. It is also registered for the control of Botrytis, Grey Mould, Rust and Septoria and Alternaria Leaf Blight for application on ornamental plants.
Edict Duo is a broad spectrum fungicide containing the active ingredients Trifloxystrobin (100g/L) and Tebuconazole (200g/L). It is registered for the control of Anthracnose, Brown Patch, Winter Fusarium, Helminthosporium diseases (including White Helmo), Leptosphaerulina, Curvularia, Dollar Spot and ERI (Ectotrophic Root Infecting Fungi) diseases.
Edict Disease Control is fungicide for use on Lawns, Azaleas, Roses, other general ornamental gardenplants. Edict Disease Control provides systemic andcontact disease control, both on a preventative andcurative basis. Edict controls Anthracnose, Brown Patch, Winter Fusarium, Leptosphaerulina (Leaf Blight), Curvularia (Fading Out) and Dollar Spot in lawn situations. Edict also controls azalea petal blight, myrtle rust, Botrytis Blight, Leaf Spots as well as mildew.
