Alfalfa

Pest Management Guidelines


Susceptibility of Weeds to Herbicide Control in Seedling Alfalfa

(Reviewed 11/06, updated 7/09)

In this Guideline: More about weeds in alfalfa:

Susceptibility of Broadleaf Weeds in Seedling Alfalfa to Herbicide Control
Customize list of weeds
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
NNNNNNNPPNNNNNNNNN
NNNNNNNCCPCPCNN
NNNNNNNCPNNNNNPNN
NNNNNNNCPCCCCPCNNN
CCCCCNNCCCCCCNPNNN
PCCNNNNCNNPNNNNPNN
NNPNNNNCCCCCPCNNN
NNNCCNNPPNPNPNPNNN
NNNNNNNPPPCPCNPNNN
NPCPCNNCCNNNNNPNNN
NNNNNNNCNNPPCNNCNN
PCCCCNNCCCCCCCNN
NPCPPNNCCPCPCNNCNN
CCCCCNNCCNNPCPCCNN
NNNNNNNCPCCPCPCNNN
PCCPCNNCNNNNNPCNNN
NNNNNNNPNPCPCNNNNN
NNPNPNNCNNNNPPNNN
NPCCCNNCPCCCCNPNNN
NNPNNNNPNPCPCNNNNN
PCCCCNNCCCCCCCCNN
PPPCNNNPNN
NNNNPNNCPNNNNPCNNN
CCCNPNNCCCCCCNNCNN
NPCNPNNCPPCPCNPNNN
NNNNNNNCNCCNNPCPNN
PCCPCNNCPCCCCCCCNN
NNNNNCCCCNNCNN
NPPCCNNCPPCCCNPNNN
PCCPCNNCCCCCNPNNN
PCCCCNNCNNNNCNNN
NNNNNNNCNNNNNNNPNN
NNNNNNCCCCNN
NNNNNNNCCNNCCNN
NNNPCNNCNNCNNN
CCCCCNNCCCCCCNPNNN
NNPNPNNCCCCNPNNN
PCCNNNCCNNNN
 
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
Customize list of weeds
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
NNNNNNCCCNNNCCPPCCC
NNNNNNCCCNCCCCPPNCC
NNNNNNPCCPNPNPPCCNN
NNNNNNCCCNNNCCPPCP
NNNNNNCCCNNPCCNPNCC
NNNNNNCCNNNPPPPNP
NNNNNNPCCNNPCCPPNCC
NNNNNNPPCNNNNNNNNPP
NNNNNNCCCNPPCCPPCCC
NNNNNNPCPNNNNNNNPC
NNNNNNCCC/P^NNNCCPCCCC
NNNNNNCCCNNPCCPCCCC
 
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)
GLY+ = glyphosate (Roundup WeatherMax)
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
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.
+   for Roundup-ready (RR) alfalfa only
^   glyphosate (Roundup) resistance developing in many crops


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
NNNNPNNNNNP
CNNNNCCCNCC
NNNNNNNNNPP
CNNNCCCCNCC
CCCCCCCCCCC
CCNNNPNNCNP
CPNNNCCCPCC
CCCCCNNNNPP
CNNNPPPPNCC
CCCCCNNNCCC
PNNNPNNNNNN
CCCCCCCCCCC
PPPPPCPPPPC
CCCCCCNNCCC
CNNNPCCCNCC
CCCCCCNNCCN
CNNNNCPPNCC
PPNNNNNNPP
CCCCCCCCPCC
CNNNNCPPNPC
CCCCCCCCCCC
PPCCPNNPP
PCCCPNNCC
CCPPCCCCCCC
CPPPPPPPPPC
CNNNNCCCNCC
CCCCPCCCCCC
CCCCCNCC
CCCCCPPPPPC
CCCCCCCCCCC
CCCCCNNNCCN
NNNNNNNNNNN
CNNNNCCCNCC
NNNNCNNNNCC
CCCCCNNNNC
CCCCCCCCCCC
CNPPCCCPCC
CCCCCCCC
 
NNCCNNCPCPN
CNCCNCCCCCC
NNNPNNCNNCP
NNPCNNCPPPN
PNCCNPCCCPP
NNNNNNNPN
PNCCNNCCCPP
NNPNNNPPPNN
PNCCNPCCCPP
NNPNNPPPNN
NNCCNNCCCCN
PNCCNNCCCPP
 
 
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* (Butyrac 0.5, etc.)
 
7 = imazethapyr (Pursuit 0.063) + clethodim (Select Max 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.


[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

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