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How to Manage Pests

UC Pest Management Guidelines

| More pests | More crops | About guidelines |

Alfalfa

Susceptibility of Weeds to Herbicide Control in Seedling Alfalfa

(Reviewed 11/06, updated 11/06)

In this Guideline:

Broadleaf weeds: Legends
Grass weeds: Legends
Herbicide combinations: Legends
Publication
Glossary

More about weeds in alfalfa:

Seedling alfalfa
- Integrated weed management
- Susceptibility to herbicides
- Herbicide treatment table
- Weed photo gallery
Established alfalfa

Susceptibility of Broadleaf Weeds in Seedling Alfalfa to Herbicide Control

BROADLEAF WEEDS

burclover

buttercup

celery, wild

chickweed

cocklebur

dock, curly (seedling)

dovefoot

fiddleneck

fillarees

groundsel, common

henbit

jimsonweed

knotweed (seedling)

lambsquarters

lettuce, miners

lettuce, prickly

mallow, little (cheeseweed)

milkthistle

mustard, black

nettle, burning

nightshade, hairy

oxtongue, bristly

pineappleweed

pigweed, redroot

radish, wild

rockpurslane, desert

rocket, London

rush, toad

shepherd's-purse

smartweed, swamp

sowthistle

speedwell, thymeleaf

spurge, petty

spurry, corn

starthistle, yellow

sunflower, wild

swinecress

willowherb, panicle

POSTEMERGENT
24DB^*1	24DB^*3	24DB^*4	BRO¹	BRO²	CLE¹	CLE²	GLY+	HEX	IMA¹	IMA²	IMZ¹	IMZ²	PAR^*1	PAR^*2	PRO*	SET¹	SET²
N	N	N	N	N	N	N	P	P	N	N	N	N	N	N	N	N	N
N	N	N	N	N	N	N	—	—	C	C	P	C	P	C	—	N	N
N	N	N	N	N	N	N	C	P	N	N	N	N	N	P	—	N	N
N	N	N	N	N	N	N	C	P	C	C	C	C	P	C	N	N	N
C	C	C	C	C	N	N	C	C	C	C	C	C	N	P	N	N	N
P	C	C	N	N	N	N	C	N	N	P	N	N	N	N	P	N	N
N	N	P	N	N	N	N	C	—	C	C	C	C	P	C	N	N	N
N	N	N	C	C	N	N	P	P	N	P	N	P	N	P	N	N	N
N	N	N	N	N	N	N	P	P	P	C	P	C	N	P	N	N	N
N	P	C	P	C	N	N	C	C	N	N	N	N	N	P	N	N	N
N	N	N	N	N	N	N	C	N	N	P	P	C	N	N	C	N	N
P	C	C	C	C	N	N	C	—	C	C	C	C	C	C	—	N	N
N	P	C	P	P	N	N	C	C	P	C	P	C	N	N	C	N	N
C	C	C	C	C	N	N	C	C	N	N	P	C	P	C	C	N	N
N	N	N	N	N	N	N	C	P	C	C	P	C	P	C	N	N	N
P	C	C	P	C	N	N	C	N	N	N	N	N	P	C	N	N	N
N	N	N	N	N	N	N	P	N	P	C	P	C	N	N	N	N	N
N	N	P	N	P	N	N	C	—	N	N	N	N	P	P	N	N	N
N	P	C	C	C	N	N	C	P	C	C	C	C	N	P	N	N	N
N	N	P	N	N	N	N	P	N	P	C	P	C	N	N	N	N	N
P	C	C	C	C	N	N	C	C	C	C	C	C	—	C	C	N	N
—	P	P	P	C	N	N	—	—	N	P	—	—	—	—	—	N	N
N	N	N	N	P	N	N	C	P	N	N	N	N	P	C	N	N	N
C	C	C	N	P	N	N	C	C	C	C	C	C	N	N	C	N	N
N	P	C	N	P	N	N	C	P	P	C	P	C	N	P	N	N	N
N	N	N	N	N	N	N	C	N	C	C	N	N	P	C	P	N	N
P	C	C	P	C	N	N	C	P	C	C	C	C	C	C	C	N	N
N	N	N	—	—	N	N	C	C	C	C	—	—	N	N	C	N	N
N	P	P	C	C	N	N	C	P	P	C	C	C	N	P	N	N	N
P	C	C	P	C	N	N	C	C	C	C	—	C	N	P	N	N	N
P	C	C	C	C	N	N	C	N	N	N	—	—	N	C	N	N	N
N	N	N	N	N	N	N	C	N	N	N	N	N	N	N	P	N	N
N	N	N	N	—	N	N	—	—	C	C	—	—	C	C	—	N	N
N	N	N	N	N	N	N	C	C	N	N	—	—	—	C	C	N	N
N	N	N	P	C	N	N	—	C	N	N	—	—	—	C	N	N	N
C	C	C	C	C	N	N	C	C	C	C	C	C	N	P	N	N	N
N	N	P	N	P	N	N	C	C	C	C	—	—	N	P	N	N	N
P	C	C	N	—	N	N	—	—	C	C	—	—	N	N	—	N	N

BROADLEAF WEEDS

burclover

buttercup

celery, wild

chickweed

cocklebur

dock, curly (seedling)

dovefoot

fiddleneck

fillarees

groundsel, common

henbit

jimsonweed

knotweed (seedling)

lambsquarters

lettuce, miners

lettuce, prickly

mallow, little (cheeseweed)

milkthistle

mustard, black

nettle, burning

nightshade, hairy

oxtongue, bristly

pineappleweed

pigweed, redroot

radish, wild

rockpurslane, desert

rocket, London

rush, toad

shepherd's-purse

smartweed, swamp

sowthistle

speedwell, thymeleaf

spurge, petty

spurry, corn

starthistle, yellow

sunflower, wild

swinecress

willowherb, panicle

Susceptibility of Grass Weeds in Seedling Alfalfa to Herbicide Control

GRASS WEEDS

barley, hare

barnyardgrass

bluegrass, annual

brome, ripgut

canarygrass, hood

fescue, rattail

foxtail, yellow

goosegrass

oat, wild

punagrass

ryegrass, Italian

wheat, volunteer

POSTEMERGENT

24DB^*1 24DB^*2 24DB^*3 24DB^*4 BRO¹ BRO² CLE¹ CLE² GLY+ HEX IMA¹ IMA² IMZ¹ IMZ² PAR^*1 PAR^*2 PRO* SET¹ SET²

N N N N N N C C C N N N C C P P C C C

N N N N N N C C C N C C C C P P N C C

N N N N N N P C C P N P N P P C C N N

N N N N N N C C C N N N C C P P C P —

N N N N N N C C C N N P C C N P N C C

N N N N N N — C C N N N P P P P — N P

N N N N N N P C C N N P C C P P N C C

N N N N N N P P C N N N N N N N N P P

N N N N N N C C C N P P C C P P C C C

N N N N N N P C P N N N N N N N — P C

N N N N N N C C C/P^ N N N C C P C C C C

N N N N N N C C C N N P C C P C C C C

GRASS WEEDS

barley, hare

barnyardgrass

bluegrass, annual

brome, ripgut

canarygrass, hood

fescue, rattail

foxtail, yellow

goosegrass

oat, wild

punagrass

ryegrass, Italian

wheat, volunteer

Ratings Legend
C = control (100-80% control)

P = partial control (79-65% control)

N = no control (less than 65% control)

— = no information

Chemical Legend

24DB*¹ = 2,4-DB* (Butoxone 0.5, etc.)

24DB*² = 2,4-DB* (Butoxone 0.75, etc.)

24DB*³ = 2,4-DB* (Butoxone 1.0, etc.)

24DB*⁴ = 2,4-DB* (Butoxone 1.5, etc.)

BRO¹ = bromoxynil (Buctril 0.25)

BRO² = bromoxynil (Buctril 0.375)

CLE¹ = clethodim (Prism 0.1)

CLE² = clethodim (Prism 0.25)

HEX = hexazinone (Velpar 0.25)

IMA¹ = imazethapyr (Pursuit 0.063)

IMA² = imazethapyr (Pursuit 0.094)

IMZ¹ = imazamox (Raptor 0.032)

IMZ² = imazamox (Raptor 0.047)

PAR*¹ = paraquat* (Gramoxone 0.125)

PAR*² = paraquat* (Gramoxone 0.25)

PRO = pronamide (Kerb 1.0)

SET¹ = sethoxydim (Poast 0.375)

SET² = sethoxydim (Poast 0.5)

Comments
* Permit required from county agricultural commissioner for purchase or use.

Susceptibility of Weeds in Seedling Alfalfa to Herbicide Combinations Control

Customize list of weeds

Broadleaf weeds

burclover

buttercup

celery, wild

chickweed

cocklebur

dock, curly (seedling)

dovefoot

fiddleneck

fillarees

groundsel, common

henbit

jimsonweed

knotweed

lambsquarters

lettuce, miners

lettuce, prickly

mallow, little (cheeseweed)

milkthistle

mustard, black

nettle, burning

nightshade, hairy

oxtongue, bristly

pineapple-weed

pigweed, redroot

radish, wild

rockpurslane, desert

rocket, London

rush, toad

shepherd's-purse

smartweed, swamp

sowthistle

speedwell, thymeleaf

spurge, petty

spurry, corn

starthistle, yellow

sunflower, wild

swinecress

willowherb, panicle

Grass weeds

barley, hare

barnyardgrass

bluegrass, annual

brome, ripgut

canarygrass, hood

fescue, rattail

foxtail, yellow

goosegrass

oat, wild

punagrass

ryegrass, Italian

wheat, volunteer

Postemergent combinations

BRO
IMA¹ BRO
24DB*² BRO
SET³ BRO
CLE⁴ BRO
HEX⁵ IMA
24DB*⁶ IMA
CLE⁷ IMA
SET⁸ SET
24DB*⁹ IMA
PAR*¹⁰ IMA
HEX¹¹

N N N N P N N N N N P

C N N N N C C C N C C

N N N N N N N N N P P

C N N N N C P P N C C

C C C C C C C C C C C

C C N N N P N N C N P

C P N N N C C C P C C

C C C C C N N N N P P

C N N N P P P P N C C

C C C C C N N N C C C

P N N N P N N N N N N

C C C C C C C C C C C

P P P P P C P P P P C

C C C C C C N N C C C

C N N N P C C C N C C

C C C C C C N N C C N

C N N N C C C C N C C

P P N N N N N N P P —

C C C C C C C C P C C

C N N N N C P P N P C

C C C C C C C C C C C

P P C C P — N N P — P

P C C C — P N N C C —

C C P P C C C C C C C

C P P P P P P P P P C

C N N N N C C C N C C

C C C C P C C C C C C

C — — — C C C C N C C

C C C C C P P P P P C

C C C C C C C C C C C

C C C C C N N N C C N

N N N N N N N N N N N

C N N N N C C C N C C

N N N N C N N N N C C

C C C C C N N N N C —

C C C C C C C C C C C

C N P P — C C C P C C

C C — — — C C C C C C

N N C C N N C P C P N

C N C C N C C C C C C

N N N P N N C N N C P

N N P C N N C P P P N

P N C C N P C C C P P

N N N — N N — N N P N

P N C C N N C C C P P

N N P N N N P P P N N

P N C C N P C C C P P

N N P — N N P P P N N

N N C C N N C C C C N

P N C C N N C C C P P

Broadleaf weeds

burclover

buttercup

celery, wild

chickweed

cocklebur

dock, curly (seedling)

dovefoot

fiddleneck

fillarees

groundsel, common

henbit

jimsonweed

knotweed

lambsquarters

lettuce, miners

lettuce, prickly

mallow, little (cheeseweed)

milkthistle

mustard, black

nettle, burning

nightshade, hairy

oxtongue, bristly

pineapple-weed

pigweed, redroot

radish, wild

rockpurslane, desert

rocket, London

rush, toad

shepherd's-purse

smartweed, swamp

sowthistle

speedwell, thymeleaf

spurge, petty

spurry, corn

starthistle, yellow

sunflower, wild

swinecress

willowherb, panicle

Grass weeds

barley, hare

barnyardgrass

bluegrass, annual

brome, ripgut

canarygrass, hood

fescue, rattail

foxtail, yellow

goosegrass

oat, wild

punagrass

ryegrass, Italian

wheat, volunteer

Ratings Legend
C = control (100-80% control)

P = partial control (79-65% control)

N = no control (less than 65% control)

— = no information

Chemical Legend

¹ = bromoxynil (Buctril 0.25) + imazethapyr (Pursuit 0.064)

² = bromoxynil (Buctril 0.25) + 2,4-DB* (Butoxone 1.0, etc.)

³ = bromoxynil (Buctril 0.375) + sethoxydim (Poast 0.375)

⁴ = bromoxynil (Buctril 0.375) + clethodim (Prism 0.25)

⁵ = bromoxynil (Buctril 0.25) + hexazinone (Velpar 0.125)

⁶ = imazethapyr (Pursuit 0.063) + 2,4-DB* (Butoxone 0.5, etc.)

⁷ = imazethapyr (Pursuit 0.063) + clethodim (Prism 0.1)

⁸ = imazethapyr (Pursuit 0.063) + sethoxydim (Poast 0.375)

⁹ = sethoxydim (Poast 0.375) + 2,4-DB* (Butoxone 1.5, etc.)

¹⁰ = imazethapyr (Pursuit 0.063) + paraquat* (Gramoxone 0.25)

¹¹ = imazethapyr (Pursuit 0.094) + hexazinone (Velpar 0.25)

Comments
NOTE: Weed size and spray coverage impact weed control as will herbicide rate, adjuvant type, spray volume, and environmental conditions.

* Permit required from county agricultural commissioner for purchase or use.

PUBLICATION

UC IPM Pest Management Guidelines: Alfalfa
UC ANR Publication 3430
Weeds in Seedling Alfalfa
W. M. Canevari, UC Cooperative Extension, San Joaquin Co.
S. B. Orloff, UC Cooperative Extension, Siskiyou Co.
W. T. Lanini, Vegetable Crops/Weed Science, UC Davis
R. G. Wilson, UC Cooperative Extension, Lassen Co.
R. N. Vargas, UC Cooperative Extension, Madera Co.
Acknowledgment for contributions to the weeds section:
C. E. Bell, UC Cooperative Extension, San Diego Co.
R. F. Norris, Vegetable Crops/Weed Science, UC Davis
J. L. Schmierer, UC Cooperative Extension, Colusa Co.

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