
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.

Professional Post-Emergent Herbicide
★★★★★ 4.7/5
nuestra calificación editorial cómo puntuamos4.4/5 según 1,399 compradores en Amazon — su cifra, no la nuestra.
$15–$20
Precio habitual · One 0.226 oz packet treats roughly 1,000 sq ft
Enlaces de afiliado — consulte nuestra divulgación. Las comisiones nunca influyen en los veredictos.
La misma química de Celsius WG en un sobre de dosis única — segura con calor sobre céspedes de estación cálida, sin compra a granel y sin necesidad de balanza.
La manera sensata de probar Celsius sin comprometerse con un envase de tamaño profesional. Un sobre resuelve un problema puntual; si va a tratar todo el césped cada año, el envase grande sale mucho más barato por cada 1,000 pies cuadrados.
Tipo de producto
Professional Post-Emergent Herbicide
Ingrediente activo
Iodosulfuron + Thiencarbazone + Dicamba
Rango de precio
$15–$20
Cobertura
One 0.226 oz packet treats roughly 1,000 sq ft
Ideal para
Malezas difíciles y aplicaciones con calor sobre césped de estación cálida
nuestra calificación editorial
4.7 out of 5
Etiqueta leída en la base de datos de la EPA
EPA Reg. No. 432-1507
Abrimos la etiqueta aceptada de este producto en el propio Pesticide Product Label System de la EPA — la fuente más sólida que existe sobre lo que un producto está registrado para hacer.
Label read 2026-08-02: thiencarbazone-methyl 8.7%, iodosulfuron-methyl-sodium 1.9%, dicamba 57.4%. Registrant is 432 (Envu, formerly Bayer Environmental Science); the Amazon listing title reads 'Prime Source Celsius WG', so BRAND here follows the listing while the registration follows the label — a distributor sub-registration may apply to the packet. Label restriction our articles already state correctly: DO NOT use on bahiagrass, seashore paspalum, or cool-season turf including tall fescue, fine fescue, Kentucky bluegrass, perennial ryegrass or creeping bentgrass. TEMPERATURE, read again 2026-08-02 because our articles were overstating it: the label carries NO blanket high-temperature prohibition of the kind 2,4-D turf labels carry, but it is not unrestricted — 'DO NOT use a spray adjuvant at temperatures above 90 degrees', and 'Spot treatments to St. Augustinegrass turf at temperatures above 90 degrees may cause temporary growth regulation'. It also notes temporary discoloration of warm-season grasses under stress from drought, disease or extreme cold or hot weather, and slower symptom development below 65 degrees soil temperature. 'The exception for hot weather' was too strong and has been corrected in best-weed-killer-for-bermuda-grass.mdx.
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: 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: Late 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 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
Common questions
Prime Source Celsius WG Easy Mix Packet suele costar $15–$20 y cubre One 0.226 oz packet treats roughly 1,000 sq ft.
Prime Source Celsius WG Easy Mix Packet actúa sobre Doveweed, Dollarweed, Virginia buttonweed, Crabgrass, Chamberbitter, Florida pusley, entre otros.
Iodosulfuron + Thiencarbazone + Dicamba, registrado con el n.º de registro EPA 432-1507.
Sobre de dosis única — caro por cada 1,000 pies cuadrados frente al envase a granel
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.

Weed Control
Zoysia takes almost everything the other Southern grasses cannot. Its real limits are temperature, mowing gap and growth — and it recovers slowly when you miss them.

Weed Control
Crop oil concentrate is 80–85% oil with only 15–20% surfactant in it. Not a stronger surfactant — a different product, and substituting can break the label.

Weed Control
Round hollow leaves or flat solid ones? That tells you which plant you have. Neither dies in one season, and most sprays fail for a reason you can fix.

Weed Control
Nebraska: best performance at 60–75°F, and avoid glyphosate below 40°F. Purdue: hot dry weather thickens the leaf cuticle, so the plant physically resists uptake.

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.

Grass Types
St. Augustine vs zoysia comes down to two questions: how much shade, and how much foot traffic. One tolerates each — and they are not the same grass.

Weed Control
Dallisgrass and crabgrass look alike and need opposite strategies: crabgrass dies at frost, dallisgrass comes back from the same crown for years.

Weed Control
Nutsedge ignores ordinary weed killer because it is a sedge. UC IPM: one pull does nothing — but pulling every 2 to 3 weeks drains the tuber underneath it.

Product Reviews
The best weed killer for Bermuda grass depends on the weed — and Bermuda tolerates chemistries that would scorch St. Augustine. What each option misses.
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 .