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Hairy Bittercress

Description

Hairy bittercress is a winter or summer annual weed (depending on location). Stems can be 3-9 inches long, and the leaves are mostly on the lower portion of the stem in a basal rosette. Leaf margins are deeply lobed. Leaves at the base of the plant are larger than the leaves at the top of the plant. Small hairs can be found at the base of the leaf as well as on the top of the leaf surface. Flowers are small and white. Small round fruits (capsules) develop at the ends of each branch.

Cultural Control

Winter annual broadleaf weeds germinate in the fall or winter and grow during any warm weather, which may occur in the winter, but otherwise remain somewhat dormant during the winter. They resume growth and produce seed in the spring and die as temperatures increase in late spring and early summer. They quickly invade thin turf areas especially where there is good soil moisture. Shade may also encourage growth. Many have a prostrate growth habit and are not affected by mowing. A dense, vigorous turf is the best way to reduce the encroachment of winter annual weeds. First, select adapted turfgrass cultivars for your area and then properly fertilize, mow, and water to encourage dense growth.

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

summer annual or winter annual weed

Growth Habit

upright or rosette

autopsy 3
autopsy 3
autopsy 3
autopsy 5
autopsy 5
autopsy 5
autopsy
autopsy
autopsy
p1020411
p1020411
p1020411
p1020424
p1020424
p1020424
p1050626
p1050626
p1050626
p1050627
p1050627
p1050627
weedflowers
weedflowers
weedflowers
Leaflet Number

2 - 4 pairs of leaflets arranged alternately

Leaf Margin

shallowly toothed or with a few lobes

Leaf Hairs

upper/lower surface

Leaf/Leaflet Shape

heart/kidney/spade

autopsy 3
autopsy 3
autopsy 3
p1020411
p1020411
p1020411
p1020424
p1020424
p1020424
Leaf Width

<1/2 - 1 inch

Leaf Venation

pinnate

Leaf Arrangement

alternate

p1020411
p1020411
p1020411
weed2
weed2
weed2
Root Type

fibrous

autopsy 5
autopsy 5
autopsy 5
autopsy
autopsy
autopsy
roots
roots
roots
Flower Color

white

flowers
flowers
flowers
p1040105
p1040105
p1040105
p1050626
p1050626
p1050626
p1050627
p1050627
p1050627
p1050631
p1050631
p1050631
weed3
weed3
weed3
weedflowers
weedflowers
weedflowers