Alfalfa

Agricultural pest management


Yellow foxtail in alfalfa.

Susceptibility of Weeds to Herbicide Control in Seedling Alfalfa

(Reviewed 3/17, updated 3/17)

In this Guideline: More about weeds in alfalfa:

Customize LIST OF WEEDS POSTEMERGENCE
24DB*1 24DB*2 24DB*3 24DB*4 BRO1 BRO2 CLE1 CLE2 GLY+ HEX IMA1 IMA2 IMZ1 IMZ2 PAR*1 PAR*2 SET1 SET2
Mode of Action 4 4 4 4 6 6 1 1 9 5 2 2 2 2 22 22 1 1
BROADLEAF WEEDS
Burclover N N N N N N N P P N N N N N N N N
Buttercup N N N N N N N C C P C P C N N
Celery, Wild N N N N N N N C P N N N N N P N N
Chickweed N N N N N N N C P C C C C P C N N
Cocklebur C C C C C N N C C C C C C N P N N
Dock, Curly (seedling) P C C N N N N C N N P N N N N N N
Dovefoot N N P N N N N C C C C C P C N N
Fiddleneck N N N C C N N P P N P N P N P N N
Filarees N N N N N N N P P P C P C N P N N
Fleabane P N C
Groundsel, Common N P C P C N N C C N N N N N P N N
Henbit N N N N N N N C N N P P C N N N N
Jimsonweed P C C C C N N C C C C C C C N N
Knotweed (seedling) N P C P P N N C C P C P C N N N N
Lambsquarters C C C C C N N C C N N P C P C N N
Lettuce, Miners N N N N N N N C P C C P C P C N N
Lettuce, Prickly P C C P C N N C N N N N N P C N N
Mallow, Little (cheeseweed) N N N N N N N P N P C P C N N N N
Milkthistle N N P N P N N C N N N N P P N N
Mustard, Black N P C C C N N C P C C C C N P N N
Nettle, Burning N N P N N N N P N P C P C N N N N
Nightshade, Hairy P C C C C N N C C C C C C C N N
Oxtongue, Bristly P P P C N N N P N N
Pineappleweed N N N N P N N C P N N N N P C N N
Pigweed, Redroot C C C N P N N C C C C C C N N N N
Radish, Wild N P C N P N N C P P C P C N P N N
Rockpurslane, Desert N N N N N N N C N C C N N P C N N
Rocket, London P C C P C N N C P C C C C C C N N
Rush, Toad N N N N N C C C C N N N N
Shepherd's-Purse N P P C C N N C P P C C C N P N N
Smartweed, Swamp P C C P C N N C C C C C N P N N
Sowthistle P C C C C N N C N N N N C N N
Speedwell, Thymeleaf N N N N N N N C N N N N N N N N N
Spurge, Petty N N N N N N C C C C N N
Spurry, Corn N N N N N N N C C N N C N N
Starthistle, Yellow N N N P C N N C N N C N N
Sunflower, Wild C C C C C N N C C C C C C N P N N
Swinecress N N P N P N N C C C C N P N N
Willowherb, Panicle P C C N N N C C N N N N
GRASS WEEDS
Barley, Hare N N N N N N C C C N N N C C P P C P
Barnyardgrass N N N N N N C C C N C C C C P P C C
Bluegrass, Annual N N N N N N P C C P N P N P P C N N
Brome, Ripgut N N N N N N C C C N N N C C P P P
Canarygrass, Hood N N N N N N C C C N N P C C N P C C
Fescue, Rattail N N N N N N C C N N N P P P P N P
Foxtail, Yellow N N N N N N P C C N N P C C P P C C
Goosegrass N N N N N N P P C N N N N N N N P P
Oat, Wild N N N N N N C C C N P P C C P P C C
Punagrass N N N N N N P C P N N N N N N N P C
Ryegrass, Italian N N N N N N C C C/P^ N N N C C P C C C
Wheat, Volunteer N N N N N N C C C N N P C C P C C C
C= control    P= partial control    N= no control    = no information
Chemical Legend
24DB*1 = 2,4-DB* (Butyrac 0.5)    MOA: 4    IMA1 = imazethapyr (Pursuit 0.063)
24DB*2 = 2,4-DB* (Butyrac 0.75) MOA: 4 IMA2 = imazethapyr (Pursuit 0.094)
24DB*3 = 2,4-DB* (Butyrac 1.0) MOA: 4 IMZ1 = imazamox (Raptor 0.032)
24DB*4 = 2,4-DB* (Butyrac 1.5) MOA: 4 IMZ2 = imazamox (Raptor 0.047)
BRO1 = bromoxynil (Buctril 0.25) MOA: 6 PAR*1 = paraquat* (Gramoxone 0.125)
BRO2 = bromoxynil (Buctril 0.375) MOA: 6 PAR*2 = paraquat* (Gramoxone 0.25)
CLE1 = clethodim (Select Max 0.1) MOA: 1 SET1 = sethoxydim (Poast 0.375)
CLE2 = clethodim (Select Max 0.25) MOA: 1 SET2 = sethoxydim (Poast 0.5)
GLY+ = glyphosate (Roundup WeatherMax) MOA: 9    
HEX = hexazinone (Velpar 0.25) MOA: 5    

[Precautions]

PUBLICATION

[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Alfalfa
UC ANR Publication 3430

Weeds in Seedling Alfalfa

W. M. Canevari, UC Cooperative Extension, San Joaquin County (Emeritus)
S. B. Orloff, UC Cooperative Extension, Siskiyou County
D. H. Putnam, Plant Sciences, UC Davis

Acknowledgment for contributions to Weeds:
C. E. Bell, UC Cooperative Extension, San Diego County (Emeritus)
W. T. Lanini, Weed Science and Plant Sciences, UC Davis (Emeritus)
R. F. Norris, Vegetable Crops and Weed Science, UC Davis (Emeritus)
J. L. Schmierer, UC Cooperative Extension, Colusa County (Emeritus)
R. N. Vargas, UC Cooperative Extension, Madera County (Emeritus)
R. G. Wilson, Intermountain Research & Extension Center

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