
Weed Control
Dollarweed: The Weed That Tells You About Your Water
UF calls dollarweed a reliable indicator of wet environments. Clemson's first control step is not a herbicide — it is checking how often you irrigate.

Selective Pre- and Post-Emergent Herbicide (concentrate, warm-season turf)
★★★★☆ 4/5
nuestra calificación editorial cómo puntuamos4.3/5 según 1,158 compradores en Amazon — su cifra, no la nuestra.
$14–$19
Precio habitual · 32 oz concentrate; rate per label
Enlaces de afiliado — consulte nuestra divulgación. Las comisiones nunca influyen en los veredictos.
El herbicida pilar de los céspedes de San Agustín y centipede, y aquel cuya disponibilidad depende del estado en el que viva.
Sobre San Agustín y centipede este es el caballo de batalla, y no hay sustituto doméstico que se le acerque — funciona como preemergente y sobre malezas ya emergidas, y esas dos especies lo toleran cuando no toleran casi nada más. Por eso aparece una y otra vez en las guías de césped del Sur y por eso 1,158 personas lo han valorado. Tres advertencias corresponden al frente de esta ficha y no al final. La atrazina está regulada con más rigor que la mayoría de los herbicidas domésticos y está restringida o prohibida en algunos estados — consulte las normas de su propio estado antes de pedirla, porque un producto legal en Georgia no es automáticamente legal donde usted está. Es un contaminante documentado del agua subterránea, que es la razón de esas normas, así que no corresponde cerca de un pozo, una zanja o un sumidero pluvial; si depende de un pozo privado, lea antes nuestra guía sobre agua de pozo. Y la lista de céspedes es estrecha: esto es para San Agustín y centipede, y aplicarlo a un césped de estación fría o a bermuda fuera de las indicaciones de la etiqueta daña la hierba. Usado dentro de esos límites es barato, eficaz y difícil de reemplazar.
Tipo de producto
Selective Pre- and Post-Emergent Herbicide (concentrate, warm-season turf)
Ingrediente activo
Atrazine
Rango de precio
$14–$19
Cobertura
32 oz concentrate; rate per label
Ideal para
Control de malezas en San Agustín o centipede establecidos, allí donde su estado permita la atrazina
nuestra calificación editorial
4 out of 5
Etiqueta leída en el PDF del titular del registro
EPA Reg. No. 19713-567-829
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.
Label read 2026-08-02 on the distributor's own site. EPA Reg. No. 19713-567-829, EPA Est. No. 829-FL-1 — a three-part distributor number: base registration 19713-567 packed and distributed by Southern Agricultural Insecticides (company 829). Atrazine 4.00%. Turf sites are centipedegrass and St. Augustinegrass, which is exactly why this product cannot be recommended for corn or any other crop however well atrazine performs there — the sites list is closed. Label also states 'Not for use in the states of Alaska or Hawaii', neither of which is in our 21-state set, and 'Do not use on muck or alkaline soils'.
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.
Contrastado con la presión real de enfermedades, malezas y plagas de cada estado.
Ventana de aplicación: April–May and September, and check every label against centipede before it leaves the shelf
Ventana de aplicación: June through July, inside the same short window everything else happens in. There is no autumn second chance
Ventana de aplicación: March–May and during monsoon flushes; Celsius-type products handle 100°F+ windows
Ventana de aplicación: Bounded by the label's temperature ceiling rather than the calendar — spring treatments finish before the June heat arrives, and nothing selective goes down again until September cools off
Ventana de aplicación: March–May while weeds are young; avoid spraying drought-stressed turf in summer
Ventana de aplicación: May–June and September; high-altitude sun makes stressed turf easy to injure, so spot-treat rather than blanket-spray
Ventana de aplicación: Broadleaf sprays in May–June and again in September, when the weeds are moving sugars to the roots; skip July and August, when a stressed cool-season lawn takes the injury and the weed does not
Ventana de aplicación: April to late May, then September into October. Skip July and August entirely: this is the transition zone, and a stressed tall fescue lawn takes the injury the weed shrugs off
Ventana de aplicación: March–May and October–November; avoid applications above 85°F
Ventana de aplicación: April to early June and September–October; avoid mid-summer sprays on stressed turf
Ventana de aplicación: Year-round where the turf is actively growing, which is most of the time; the constraint is heat and drought stress on the leeward side rather than a dormant season
Ventana de aplicación: Late April into June, then September into October; skip the July and early August heat, which is also when UI's own fertilizer schedule goes quiet
Ventana de aplicación: May–June and September; fall beats creeping charlie best
Ventana de aplicación: October is the most effective month for broadleaf weeds; never apply above 80°F or to drought-stressed turf
Ventana de aplicación: October, and October is most of it — but check the wind and the date against what is happening in the fields, because early-summer growth-regulator drift is a real seasonal risk here and your own spray carries the same way
Ventana de aplicación: April into May and again in September–October; avoid July and August, when a tall fescue lawn here is already at its limit
Ventana de aplicación: April–May and September–October; autumn is the knockout window for the wild garlic that defines a Kentucky winter lawn
Ventana de aplicación: March–May and October–November; avoid applications above 85°F and never on drought-stressed St. Augustine
Ventana de aplicación: June, then a narrow late-August to mid-September window. Maine's usable autumn is the shortest in New England
Ventana de aplicación: April–May and September–October; autumn is the knockout window for the ground ivy and violet the Piedmont is full of
Ventana de aplicación: A narrow autumn is the real window here: late September into October, after the summer heat and before New England's early frost closes the season
Ventana de aplicación: May–June and September; autumn is the stronger window for perennial broadleaf weeds
Ventana de aplicación: April–May and September, avoiding the midsummer heat restrictions on most labels
Ventana de aplicación: April–May and September–October; skip summer sprays on drought-stressed fescue
Ventana de aplicación: June, then late August into September. In a sub-100-day valley there is no third chance
Ventana de aplicación: Late spring and again from late August through September, when perennial broadleaf weeds are moving reserves to the root
Ventana de aplicación: March–April and October in the south; May and September in the north
Ventana de aplicación: Late May into June, then late August through September. The autumn window closes earlier here than anywhere else in southern New England
Ventana de aplicación: May and September–October; autumn is the knockout window for perennial broadleaf weeds
Ventana de aplicación: Spring and early autumn; in the south skip the June heat entirely, and in the north the usable autumn window closes by early October
Ventana de aplicación: May and September–October; autumn is the knockout window for perennial broadleaf weeds
Ventana de aplicación: April–May and September–October; avoid spraying heat-stressed fescue in July–August
Ventana de aplicación: Early to mid-June, then late August into early September. There is no third opportunity
Ventana de aplicación: May–June and September; fall applications hit dandelion taproots hardest
Ventana de aplicación: Judged by wind before season: sustained wind is Oklahoma's normal condition, so the usable spray days are calm mornings in April, May and September rather than whole months
Ventana de aplicación: March–May and September–October; the long mild shoulder seasons give more usable spray days than most states get
Ventana de aplicación: May and September — fall is the knockout window for perennial broadleaf weeds
Ventana de aplicación: Broadleaf work in May–June and again in September; the September pass is the one that holds, because the weed is moving reserves down
Ventana de aplicación: April–May and September–October, and never above 90°F — centipedegrass is sensitive to 2,4-D both at spring green-up and in summer heat
Ventana de aplicación: Early to mid-June, then late August into September, which is the pass that actually holds on perennial broadleaf weeds
Ventana de aplicación: April–May and September–October; skip sprays on drought-stressed summer fescue
Ventana de aplicación: April–early June and September–October; avoid herbicides above 90°F
Ventana de aplicación: May and September, avoiding the intense midsummer heat on the label
Ventana de aplicación: Late May through June, then a short late-August to mid-September window. Vermont's autumn window is the narrowest in New England
Ventana de aplicación: April–May and September–October; skip sprays on heat-stressed fescue in July and August
Ventana de aplicación: April–May and September–October; WSU caps applications at 80°F, stricter than the 85–90°F ceilings used elsewhere
Ventana de aplicación: April into May and again in September–October. Skip July and August: this is transition-zone country and a heat-stressed tall fescue lawn absorbs the injury the weed does not
Ventana de aplicación: Early to mid-fall is the favourable window for dandelion and other perennial broadleaf weeds
Ventana de aplicación: June, then late August into September. UW's own framing is useful: a slow-release application covers a 90 to 100 day growing season, which is roughly the entire Wyoming season
Common questions
Southern Ag Atrazine St. Augustine Weed Killer, 32 oz suele costar $14–$19 y cubre 32 oz concentrate; rate per label.
Southern Ag Atrazine St. Augustine Weed Killer, 32 oz actúa sobre annual bluegrass, chickweed, henbit, dollarweed, clover.
Atrazine, registrado con el n.º de registro EPA 19713-567-829.
Restringida o prohibida en algunos estados — verifique sus propias normas antes de comprar
Real feedback
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Weed Control
UF calls dollarweed a reliable indicator of wet environments. Clemson's first control step is not a herbicide — it is checking how often you irrigate.

Weed Control
NC State says it plainly: centipedegrass is sensitive to 2,4-D. It also wants no lime and almost no nitrogen — so the standard Southern routine is wrong three ways.

Weed Control
Common cannot take 2,4-D. Floratam cannot take atrazine. Bitterblue is weak on both. There is no St. Augustine answer until you know which one you have.

Fertilizer
Buying organic does not protect your well. Two things decide whether nitrogen reaches it — how much you apply and how much water moves through. Both are free to fix.

Weed Control
Poa annua germinates in autumn, so the window to stop it closes in September — and on a cool-season lawn it is the same window you seed in. Not both.

Product Reviews
There is no best weed killer for lawns, only the right one for your weed: the seven chemistries that matter, what each kills, and the one that kills grass too.

Fertilizer
Weed and feed does two jobs on two different calendars, so one bag rarely times both right. The month it works, and the lawns the label forbids.

Grass Types
St. Augustine grass care: mow high, watch for chinch bugs, and know it cannot be seeded — only sod, plugs or sprigs. Plus the herbicides that damage it.
Boletín de Lawn Health
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 .