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Oldfield Toadflax

Description

Oldfield toadflax is also known as common or blue toadflax. It is a winter annual or biennial weed that is commonly found blooming in the spring in fields and roadsides. Oldfield toadflax is most often found in the Piedmont and Coastal Plain of North Carolina. The plant can flower from early spring (most common) to late fall (less common) - depending on growing conditions. The small blue flowers have three lobes and basal spurs. The leaves are small, bright green and linear. Small clumps of leaves will form in early spring, and the blue flowers will appear on long green stems shortly thereafter.

Cultural Control

Proper turf management is important for biennial broadleaf weed control. Maintain a dense, actively growing turf through proper mowing, fertilizing, and watering practices. Mow at the proper height for your selected adapted turfgrass. Coring and traffic control reduce compaction and encourage desirable turfgrass competition. It is best to control this biennial broadleaf weed in spring or fall, if actively growing at these times.

Chemical Control

Herbicide and Formulation
Amount of Formulation per 1,000 sq ft
Amount of Formulation per Acre
Pounds Active Ingredient per Acre

Preemergence and Postemergence Control

Herbicide and Formulation

mesotrione, MOA 27 (Tenacity) 4 SC

Amount of Formulation per 1,000 sq ft

0.092 to 0.183 fl oz

Amount of Formulation per Acre

4 to 8 fl oz

Pounds Active Ingredient per Acre

0.125 to 0.25

Precaution and Remarks

Use on residential turf, golf courses (not greens) and sod farms for pre- and postemergence weed control. Tolerant turfgrasses include St. Augustinegrass, centipedegrass, tall fescue, fine fescue, Kentucky bluegrass, and perennial ryegrass. Add a nonionic surfactant and repeat application after 2 to 3 weeks for improved postemergence control. Tank mix with Barricade 65 WG for extended preemergence grassy weed control. Can be applied at seeding to all tolerant grasses except fine fescue. After turf germination, wait 4 weeks or until turf has been mowed twice before making a postemergence application. Also controls henbit, chickweed, dandelion, white clover, Florida betony, Florida pusley, ground ivy, oxalis, wild violet, creeping bentgrass, and yellow nutsedge.

Preemergence and Postemergence Control

Herbicide and Formulation

sulfentrazone + prodiamine, MOA 14 + 3 (Echelon 4 SC) 4 SC

Amount of Formulation per 1,000 sq ft

0.184 to 0.826 fl oz

Amount of Formulation per Acre

0.5 to 2.25 pt

Pounds Active Ingredient per Acre

0.25 to 1.125

Precaution and Remarks

For use in residential and institutional lawns, athletic fields, sod farms, golf course fairways and roughs, roadsides, utility right-of-ways, railways, and industrial areas. Apply to turf following a second mowing if a good root system has been established. Apply up to 12 fluid ounces per acre to bentgrass at 0.5 inches or higher, fine fescue, and perennial ryegrass. Apply 18 to 24 fluid ounces per acre to perennial bluegrass, tall fescue, and all warm season grasses except St. Augustinegrass (do not apply) and bermudagrass (apply 18 to 36 fluid ounces per acre). For sod production, apply 6 months after establishment, and do not harvest within 3 months. Do not apply with adjuvants or surfactants. Echelon should not be applied to cool-season turf with N-containing fertilizers unless some short-term discoloration is tolerable.

Presentations

Publications

Species Data

Growth Season/Life Cycle

winter annual weed or biennial weed

Growth Habit

upright

p1040527
p1040527
p1040527
p1040555
p1040555
p1040555
p1040558
p1040558
p1040558
p1050503
p1050503
p1050503
weed3
weed3
weed3
weed4
weed4
weed4
Leaflet Number

one

Leaf Margin

smooth

seedlings
seedlings
seedlings
Leaf Hairs

none

Leaf/Leaflet Shape

linear/oblong

seedlings
seedlings
seedlings
Leaf Width

<1/2 inch

Leaf Arrangement

alternate

Flower Color

blue/purple

p1040550
p1040550
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p1040558
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p1050529
p1050529
p1050529
p1050848
p1050848
p1050848
toadflax
toadflax
toadflax
weed2
weed2
weed2
weed3
weed3
weed3
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weed4
weed4