Alfalfa

Agricultural pest management


Yellow foxtail in alfalfa.

Susceptibility of Weeds to Herbicide Control in Established Alfalfa

(Reviewed 3/17, updated 3/17)

In this Guideline: More about weeds in alfalfa:

Susceptibility of Winter Weeds in Established Alfalfa to Herbicide Control
Customize list of weeds 24DB* CAR CLE DIU EPT FLU GLY+ HAL HEX IMA MET NOR PAR* PEN SAF SET TRI1
Mode of Action 4 14 1 7 8 14 9 2 5 2 5 12 22 3 14 1 3
ANNUAL WEEDS
Barley, hare N N C P P C P N C C C C N P C
Bluegrass, annual N N C C C P C P P P C P C N N C
Bluegrass, bulbous N N N N C P N C C N N P
Brome, downy N N C P C C C N C C C C N C C
Canarygrasses N N P C C C P P C C P C N C C
Cereal, volunteer N N C C C C P N P C P C N P N
Chickweed, common N P N C C C C C P C C C P C C N P
Fiddlenecks (seedling) N C N C P C C C P C P P C C N C
Filarees (seedling) P C N C N C C C C C N N N P N N
Fleabane, hairy P C N N C C C N N C N C N N
Flixweed C C N C N C C C C N C C N N
Groundsel, common N P N N P C C C C P P N P N C N N
Lettuce, prickly C C N P C C C C N C N P N C N N
Mallow, little (cheeseweed) (seedling) N C N P N C C C P C C P N P C N N
Miner's lettuce N P N C N C C C C C P C C N C
Mustards C C N P N C C C C C C C P P C N N
Nettle, burning P C N C P C P C C C C N P N C N C
Oat, wild N N C N C C C P P N C P P N C N
Pepperweeds C N C N N P P C C N C N N N
Radish, wild N C N C N C C C C C C P N C N N
Rocket, London P C N C P C C C C C C C C P C N N
Ryegrass, Italian N N C P C C/P^ C N C C C C N C C
Shepherd's-purse P C N C P C C C C C C C P P C N N
Sowthistles C C N P C P C C C N N P N N C N C
Starthistle, yellow C N C C C C C N C N P N N N
Susceptibility of Spring/Summer Weeds in Established Alfalfa to Herbicide Control
Customize list of weeds 24DB* CAR CLE DIU EPT FLU GLY+ HAL HEX IMA MET NOR PAR* PEN SAF SET TRI1
Mode of Action 4 14 1 7 8 14 9 2 5 2 5 12 22 3 14 1 3
ANNUAL WEEDS
Barnyardgrass N N C P C C P C C C P C N C C
Cupgrass, prairie N N C P P C P N C P N C C
Dodders N P N N N C N P N N P C P N C
Foxtail, green N N C C C C C C P C N C C
Foxtail, yellow N N C P C C C C P C N C N C C
Goosefoot, nettleleaf C N C C C C C P C C C C N N C
Goosegrass N N C C C P P C P C N C
Junglerice N N C C C C C P P C P N C C
Knotweed, prostrate P C N C P C C C C N P P C C N C
Lambsquarters, common C C N C C C C N C P P P N C C N P
Nightshades C C N C C C C N C C N C P N C N N
Pigweeds C C N C C C C P C C C C P C C N C
Stinkgrass N N C C C P N P C P N C C
Thistle, Russian P C N N P C P P P C P P C N P
Witchgrass N N C N C C P N C C P N C C
PERENNIAL WEEDS
Barley, foxtail N N C P P C P N C C P N C P
Bermudagrass (established) N N P N N C N N N N P N N N P N
Bermudagrass (seedling) N N C N C C N P P N C P C N C C
Bindweed, field (established) P N N N N N P N N N N N N N N N P
Bindweed, field (seedling) C C N P N C C N P P P C N P
Dandelion (established) C P N N N C P N P N P N P N N
Dandelion (seedling) C C N C C C C P C N N N C N N
Johnsongrass (established) N N C N N C N P N C N N N C N
Johnsongrass (seedling) N N C C C C C C N C C C N C C
Nutsedge, yellow N N N N P P P C N P P P N N N N N
Plantain, buckhorn (seedling) C C N C C C C C N
Plantain, buckhorn (established) P N N N P P N N N N N N N N
Quackgrass N N P P C P P N N L N
C= control    P= partial control    N= no control    = no information
NOTE: Weed size and spray coverage affect weed control as will herbicide rate, adjuvant type, spray volume, and environmental conditions.
24DB = 2,4-DB* (Butyrac) MOA: 4      IMA = imazethapyr (Pursuit) (highest rate) MOA: 2
CAR =carfentrazone (Shark) MOA: 14 MET = metribuzin (Tricor DF) MOA: 5
CLE = clethodim (Select Max)) MOA: 1 NOR = norflurazon (Solicam) MOA: 12
DIU = diuron (Karmex) MOA: 7 PAR = paraquat* (Gramoxone SL 2.0) MOA: 22
EPT = EPTC (Eptam) MOA: 8 PEN = pendimethalin (Prowl H2O) MOA: 3
FLU = flumioxazin (Chateau) MOA: 14 SAF =saflufenacil (Sharpen) MOA: 14
GLY1 = glyphosate (Roundup) MOA: 9 SET = sethoxydim (Poast) MOA: 1
HAL = halosulfuron (Sandea) MOA: 2 TRI = trifluralin1 (Treflan, Trilin) MOA: 3
HEX = hexazinone (Velpar) MOA: 5      
* Permit required from county agricultural commissioner for purchase or use.
+ For use in Roundup Ready alfalfa only.
1 Not usually applied at times suitable for controlling winter weeds.
▽ Group numbers are assigned by the Weed Science Society of America (WSSA) according to different modes of action. Although weeds may exhibit multiple resistance across many groups, mode-of-action numbers are useful in planning mixtures or rotations of herbicides with different modes of action.

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Alfalfa
UC ANR Publication 3430

Weeds in Established Alfalfa

W. M. Canevari, UC Cooperative Extension, San Joaquin County
S. B. Orloff, UC Cooperative Extension, Siskiyou County
W. T. Lanini, Weed Science/Plant Sciences, UC Davis
R. G. Wilson, UC Cooperative Extension, Lassen County
R. N. Vargas, UC Cooperative Extension, Madera County

Acknowledgment for contributions to Weeds:
C. E. Bell, UC Cooperative Extension, San Diego County
R. F. Norris, Vegetable Crops/Weed Science, UC Davis
J. L. Schmierer, UC Cooperative Extension, Colusa County

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