Lawn Diseases
Lawn Rust: The Disease You Mow Off
Illinois Extension: the rust is removed by the mower blade. It is the one lawn disease where the treatment is a machine you already own — and a sharp one.
Systemic DMI fungicide concentrate (Group 3)
Atticus Gravex 20 EW Fungicide, 16 oz — Reseña
★★★★☆ 4/5
nuestra calificación editorial cómo puntuamos4.4/5 según 341 compradores en Amazon — su cifra, no la nuestra.
$32–$45
Precio habitual · 1.2 fl oz per 1,000 sq ft on residential turf — a 16 oz bottle covers roughly 13,000 sq ft
Enlaces de afiliado — consulte nuestra divulgación. Las comisiones nunca influyen en los veredictos.
Un concentrado puro de miclobutanil cuya etiqueta sí cubre el césped residencial — y que NO es compañero de rotación del propiconazol que la mayoría de los propietarios ya tiene.
Nuestro Veredicto
Vale la pena tenerlo por una razón concreta y vale la pena entenderlo por otra. La razón para tenerlo: es un DMI sistémico genuino al 19.7% cuya etiqueta cubre expresamente el césped residencial establecido, a 1.2 onzas líquidas por cada 1,000 pies cuadrados — la mayoría de las opciones para propietarios son granulados o pulverizadores de manguera a una fracción de esa concentración, y esta es la formulación profesional con el césped doméstico dentro de la etiqueta y no fuera de ella. La razón para entenderlo: la etiqueta lo clasifica como inhibidor de la desmetilación de esteroles del Grupo 3 e indica que, tras dos aplicaciones consecutivas de Gravex 20 EW, de otro producto con miclobutanil o de otro DMI, hay que rotar a un fungicida con otro modo de acción. El propiconazol también es un DMI. Así que alternar este producto con el frasco de propiconazol del estante no es rotar: es el mismo grupo dos veces — el verdadero compañero de rotación es el granulado de azoxistrobina, que es Grupo 11. Otra línea de la etiqueta que conviene leer antes de comprar: se sabe que el miclobutanil puede lixiviar a través del suelo hasta el agua subterránea en ciertas condiciones, algo muy real en suelos arenosos o con capa freática somera.
✅ A favor
- El césped residencial figura en la etiqueta, no solo se sobreentiende
- Concentrado al 19.7% — un frasco trata una superficie grande
- Sistémico, protectante Y curativo según la etiqueta
- La etiqueta declara su grupo FRAC y su propia regla de rotación, algo que pocas etiquetas de consumo hacen
⚠️ En contra
- Mismo Grupo 3 que el propiconazol — no forman pareja de rotación
- La etiqueta advierte que el miclobutanil puede lixiviar al agua subterránea en ciertas condiciones
- Los condados de Nassau y Suffolk (Nueva York) limitan la dosis anual
- La dosis residencial está topada por debajo de la comercial en la misma etiqueta
Tipo de producto
Systemic DMI fungicide concentrate (Group 3)
Ingrediente activo
Myclobutanil 19.7%
Rango de precio
$32–$45
Cobertura
1.2 fl oz per 1,000 sq ft on residential turf — a 16 oz bottle covers roughly 13,000 sq ft
Ideal para
Quien prefiere un concentrado antes que un pulverizador de manguera, y lo rota contra azoxistrobina y no contra propiconazol
nuestra calificación editorial
4 out of 5
De dónde salen nuestros datos
Etiqueta leída en el PDF del titular del registro
EPA Reg. No. 91234-283
Leímos la etiqueta impresa publicada por la empresa titular del registro. La EPA no aloja un PDF de esta, así que es el mejor texto disponible.
What we found when we read it
Full specimen label read 2026-08-08 on Atticus's own site. EPA Reg. No. 91234-283, myclobutanil 19.7%, other ingredients 80.3%. The label states its own resistance class — 'Gravex 20 EW belongs to the sterol demethylation inhibitor (DMI) class of fungicides and is classified as a Group 3 fungicide' — and its own rotation rule: after two consecutive applications of Gravex 20 EW, another myclobutanil product, or another DMI, rotate to a labelled fungicide with a different mode of action. THAT MATTERS FOR OUR CATALOGUE: our other lawn DMI is propiconazole, so the two are the same group and are not a rotation pair; azoxystrobin (Group 11) is. RESIDENTIAL TURF IS ON THE LABEL and is rated separately from commercial: non-residential turfgrass runs to 2.4 fl oz per 1,000 sq ft while residential is 1.2 fl oz per 1,000 sq ft — the same commercial-higher-than-residential pattern found on the Ike's sandbur/crabgrass preventer label. STATE RESTRICTION: 'For Nassau and Suffolk Counties in New York State, DO NOT apply more than 3.43 fl oz of Gravex 20 EW per 1000 sq ft per year (1.95 lb ai per acre)', with a separate cap of no more than 5 applications per year. The label also carries a groundwater advisory: 'Myclobutanil is known to leach through soil into groundwater under certain conditions as a result of label use.'
Where this page and the container disagree, the container wins — the label is the legal authority on rates and restrictions. How to read one yourself.
Dónde Importa Este Producto
Contrastado con la presión real de enfermedades, malezas y plagas de cada estado.
Arizona
Arizona hub →Rust (winter ryegrass)
Arkansas
Arkansas hub →Brown patch (tall fescue in the Ozarks)Spring dead spot (bermuda)
California
California hub →Brown patch (fescue under summer night irrigation)AnthracnoseRust (shaded, underfed lawns)
Colorado
Colorado hub →Powdery mildew (shaded bluegrass)
Connecticut
Connecticut hub →Red thread (the New England signature — pink threads on ryegrass and fine fescue in a cool wet spring, and it reads as a nitrogen shortage more than an infection)Brown patch (July and August on tall fescue, once the nights stop cooling off)
Delaware
Delaware hub →Brown patch — the defining disease of a Delaware tall fescue lawn, because humid nights that never drop below the high 60s are the normal July here rather than the exceptionGray leaf spot (tall fescue and perennial ryegrass, late summer, and it kills a stand faster than brown patch does)
Georgia
Georgia hub →Spring dead spot (bermuda)
Hawaii
Hawaii hub →Large patch and brown patch (Rhizoctonia) on zoysia and St. Augustine, running whenever warm humid conditions persist — which on the windward side is most of the year
Indiana
Indiana hub →Red thread (slow-growing lawns, late spring)Rust (slow-growing lawns, August through October)
Kansas
Kansas hub →Brown patch (Rhizoctonia solani) — the tall fescue killer here, running when temperatures pass 80°F with high humidity and high nitrogen, and capable of taking a stand out in a long hot humid stretchSpring dead spot on bermudagrass
Kentucky
Kentucky hub →Brown patch (tall fescue's summer killer statewide)Spring dead spot (bermuda in the west)
Maine
Maine hub →Red thread on ryegrass and fine fescue in a cool wet spring, which reads as a nitrogen shortage more than an infectionBrown patch — a southern-coast problem, uncommon inland and north
Maryland
Maryland hub →Brown patch (tall fescue's July and August killer statewide)Red thread (cool wet springs)
Massachusetts
Massachusetts hub →Brown patch (tall fescue in a humid coastal July)
Michigan
Michigan hub →Red thread
Missouri
Missouri hub →Brown patch (tall fescue's July and August killer)Spring dead spot (bermuda in the south)
Nebraska
Nebraska hub →Leaf rust on bluegrass in late summer, which turns shoes orange before anyone notices the lawn
Nevada
Nevada hub →Anthracnose on drought-stressed turf
New Hampshire
New Hampshire hub →Red thread (cool wet springs on ryegrass and fine fescue, and it reads as a nitrogen shortage)Brown patch (a Seacoast and southern-tier problem more than a North Country one)
New Jersey
New Jersey hub →Brown patch (tall fescue in humid July weather)Red threadRust (late-summer, underfed lawns)
New Mexico
New Mexico hub →Spring dead spot on bermudagrass, appearing as the lawn greens up
New York
New York hub →Red threadBrown patch (tall fescue and ryegrass in humid August weather)
⚖️ The label caps the annual rate in Nassau and Suffolk Counties: do not apply more than 3.43 fl oz per 1,000 sq ft per year (1.95 lb ai per acre). That is a Long Island rate limit rather than a prohibition — the rest of New York is unaffected.
North Carolina
North Carolina hub →Brown patch (the #1 tall fescue killer)Spring dead spot (Bermuda)
North Dakota
North Dakota hub →Leaf rust on bluegrass late in the season
Ohio
Ohio hub →Red threadRust (late summer on underfed lawns)
Oklahoma
Oklahoma hub →Spring dead spot (the bermuda disease Oklahoma winters create — patches that never green up in April)Brown patch (tall fescue in the northeast)
Oregon
Oregon hub →Red threadRustAnthracnose
Pennsylvania
Pennsylvania hub →Red thread on underfed lawns in a cool wet MayPowdery mildew (bluegrass under the state's heavy tree cover)Brown patch (tall fescue in a humid July)
Rhode Island
Rhode Island hub →Red thread (the fine-fescue and ryegrass disease of a cool wet Rhode Island spring — it reads as low nitrogen more than as an infection)Brown patch (humid bay nights are what make it a Rhode Island problem rather than an occasional one)Anthracnose (URI works on fungicide-resistant strains of it with UMass, which tells you how established it is in this corner of New England)
South Carolina
South Carolina hub →Brown patch (tall fescue in the Upstate)
South Dakota
South Dakota hub →Leaf rust on bluegrass late in the season
Tennessee
Tennessee hub →Brown patch (tall fescue's summer nemesis statewide)Spring dead spot (Bermuda)
Texas
Texas hub →Brown patch / large patchSpring dead spot (Bermuda)
Vermont
Vermont hub →Red thread (cool wet spring on ryegrass and fine fescue, reading as a nitrogen shortage)Brown patch — real in the Champlain Valley and the southern river valleys, uncommon at elevation
Virginia
Virginia hub →Brown patch (tall fescue's summer nemesis here)Spring dead spot (bermuda)
Washington
Washington hub →Red thread (the signature western Washington disease, fall through spring)
West Virginia
West Virginia hub →Brown patch — the defining disease of a West Virginia tall fescue lawn, driven by humid valley nights that never cool off in JulyGray leaf spot on tall fescue and perennial ryegrass in late summer, which takes a stand out faster than brown patch doesRed thread in a cool wet spring, reading as a nitrogen shortage more than an infection
Wisconsin
Wisconsin hub →Red thread
Common questions
Common Questions
¿Cuánto cuesta Atticus Gravex 20 EW Fungicide, 16 oz?
Atticus Gravex 20 EW Fungicide, 16 oz suele costar $32–$45 y cubre 1.2 fl oz per 1,000 sq ft on residential turf — a 16 oz bottle covers roughly 13,000 sq ft.
¿Qué controla Atticus Gravex 20 EW Fungicide, 16 oz?
Atticus Gravex 20 EW Fungicide, 16 oz actúa sobre Brown patch, Anthracnose, Red thread, Rust, Spring dead spot, Powdery mildew.
¿Cuál es el ingrediente activo de Atticus Gravex 20 EW Fungicide, 16 oz?
Myclobutanil 19.7%, registrado con el n.º de registro EPA 91234-283.
¿Cuál es la mayor desventaja de Atticus Gravex 20 EW Fungicide, 16 oz?
Mismo Grupo 3 que el propiconazol — no forman pareja de rotación
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Boletín de Lawn Health
Recordatorios de temporada, a tiempo
Ventanas de preemergentes, alertas de enfermedades y calendarios de fertilización para su región — un correo corto, justo cuando su césped lo necesita.
Gratis para siempre. Cancele cuando quiera. Solo céspedes en EE. UU. (por ahora). Los correos se envían en inglés. El complemento de esta temporada: la lista imprimible de verano .