How to Manage Pests

UC Pest Management Guidelines

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 N C P P — C — P N C C P — C P N C P C — C — P C C C P C C C N C P P — C — P N — C P — C C N N N N — C — N P N N P C N C N C C C — C — C C P C — — C C N C P C — C — C C P C N C C C C N C C C C — C P C C C C N C N C C C — P — — — P C P C — C N C C C — C — C P P C P — C C P N C P C C — C C N P P C N C C N C C C C N C P P P N C N P C N C C C C N C C N C P N N N C N C C C C P C C C C P C N C N — P P — C — P P — — N — L N N — C C — C — P N P C P — C C P N N P — C — P P P C P P N P N C N C — C — P N C C P — C C   N P N N — C N N N N P N N P N N C N C — C N P P N C P C C C P N N N N P N N N N N N N N P C N P N — C — C — N P P P N P C N N N — C — P N P N P N N N C N C C — C — C P C N N N N N N C N N — C — N P N C N N C N N C C C — C — C C N C C C C C N N N P P P C N P P P N N N N C N C — — C — C — — — C — N — P N N — — P — P N N N N N N N

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.

PUBLICATION

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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