Alfalfa

Pest Management Guidelines


Susceptibility of Weeds to Herbicide Control in Established Alfalfa

(Reviewed 11/06, updated 7/09)

In this Guideline: More about weeds in alfalfa:

Susceptibility of Winter Weeds in Established Alfalfa to Herbicide Control
Customize list of weeds
ANNUAL WEEDS
barley, hare
bluegrass, annual
bluegrass, bulbous
brome, downy
canarygrasses
cereal, volunteer
chickweed, common
fiddlenecks (seedling)
filarees (seedling)
flixweed
groundsel, common
lettuce, prickly
mallow, little (cheeseweed) (seedling)
miner's lettuce
mustards
nettle, burning
oat, wild
pepperweeds
radish, wild
rocket, London
ryegrass, Italian
shepherd's-purse
sowthistles
starthistle, yellow
 
24D* CLE DIU EPT FLU GLY1 HAL HEX IMA MET NOR PAR* PEN SET TRI2
NCPPCPNCCCCPC
NCCCPCPPPCPCNC
NNNCPNCCNP
NCPCCCNCCCCCC
NPCCCPPCCPCCC
NCCCCPNPCPCPN
NNCCCCCPCCCPCNP
NNCPCCCPCPPCNC
PNCNCCCCCNNNNN
CNCNCCCCNCNN
NNNPCCCCPPNPNNN
CNPCCCCNCNPNNN
NNPNCCCPCCPNPNN
NNCNCCCCCPCNC
CNPNCCCCCCCPPNN
PNCPCPCCCCNPNNC
NCNCCCPPNCPPCN
CNCNNPPCCNCNNN
NNCNCCCCCCPNNN
PNCPCCCCCCCCPNN
NCPCC/P3CNCCCCCC
PNCPCCCCCCCPPNN
CNPCPCCCNNPNNNC
CNCCCCCNCNPNNN
 
ANNUAL WEEDS
barley, hare
bluegrass, annual
bluegrass, bulbous
brome, downy
canarygrasses
cereal, volunteer
chickweed, common
fiddlenecks (seedling)
filarees (seedling)
flixweed
groundsel, common
lettuce, prickly
mallow, little (cheeseweed) (seedling)
miner's lettuce
mustards
nettle, burning
oat, wild
pepperweeds
radish, wild
rocket, London
ryegrass, Italian
shepherd's-purse
sowthistles
starthistle, yellow

Susceptibility of Spring/Summer Weeds in Established Alfalfa to Herbicide Control
Customize list of weeds
ANNUAL WEEDS
barley, foxtail
barnyardgrass
cupgrass, prairie
dodders
foxtail, green
foxtail, yellow
goosefoot, nettleleaf
goosegrass
junglerice
knotweed, prostrate
lambsquarters, common
nightshades
pigweeds
quackgrass
stinkgrass
thistle, Russian
witchgrass
PERENNIAL WEEDS
bermudagrass (established)
bermudagrass (seedling)
bindweed, field (established)
bindweed, field (seedling)
dandelion (established)
dandelion (seedling)
johnsongrass (established)
johnsongrass (seedling)
nutsedge, yellow
plaintain, buckhorn (seedling)
plantain, buckhorn (established)
 
24D* CLE DIU EPT FLU GLY1 HAL HEX IMA MET NOR PAR* PEN SET TRI2
NCPPCPNCCPCP
NCPCCPCCCPCCC
NCPPCPNCPCC
NNNNCNPNNPCNC
NCCCCCCPCCC
NCPCCCCPCNCCC
CNCCCCCPCCCCNC
NCCCPPCPCC
NCCCCCPPCPCC
PNCPCCCCNPPCNC
CNCCCCNCPPPNCNP
CNCCCCNCCNCPNNN
CNCCCCPCCCCPCNC
NPPCPPNLN
NCCCPNPCPCC
PNNPCPPPCPPNP
NCNCCPNCCPCC
 
NPNNCNNNNPNNPN
NCNCCNPPNCPCCC
PNNNNPNNNNNNNNP
CNPNCCNPPPNP
CNNNCPNPNPNNN
CNCCCCPCNNNNN
NCNNCNPNCNNCN
NCCCCCCNCCCCC
NNNPPPCNPPPNNNN
CNCCCCN
PNNPPNNNNNNN
 
ANNUAL WEEDS
barley, foxtail
barnyardgrass
cupgrass, prairie
dodders
foxtail, green
foxtail, yellow
goosefoot, nettleleaf
goosegrass
junglerice
knotweed, prostrate
lambsquarters, common
nightshades
pigweeds
quackgrass
stinkgrass
thistle, Russian
witchgrass
PERENNIAL WEEDS
bermudagrass (established)
bermudagrass (seedling)
bindweed, field (established)
bindweed, field (seedling)
dandelion (established)
dandelion (seedling)
johnsongrass (established)
johnsongrass (seedling)
nutsedge, yellow
plaintain, buckhorn (seedling)
plantain, buckhorn (established)

Ratings Legend
C= control P= partial control N= no control L = controlled according to herbicide label = no information

Chemical Legend
24D = 2,4-DB* (Butyrac)
CLE = clethodim (Select Max))
DIU = diuron (Karmex)
EPT = EPTC (Eptam)
FLU = flumioxazin (Chateau)
GLY1 = glyphosate (Roundup)
HAL = halosulfuron (Sandea)
HEX = hexazinone (Velpar)
 
IMA = imazethapyr (Pursuit) (highest rate)
MET = metribuzin (Sencor)
NOR = norflurazon (Solicam)
PAR = paraquat* (Gramoxone Inteon)
PEN = pendimethalin (Prowl H2O)
SET = sethoxydim (Poast)
TRI = trifluralin1 (Treflan, Trilin)
 

Comments
*   Permit required from county agricultural commissioner for purchase or use.
1   For use in Roundup-ready (RR) alfalfa only.
2   Not usually applied at times suitable for controlling winter weeds.
3   Resistant ryegrass resistance developing in many crops.

[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

Top of page


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/r1700411.html revised: April 25, 2014. Contact webmaster.