How to Manage Pests

UC Pest Management Guidelines

Susceptibility of Spring/Summer Weeds in Established Alfalfa to Herbicide Control

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 GLY1 HEX IMA MET NOR PAR* 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 N C P P C P N — C P C C N N N N C N P N N P 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 N C C C C P C C C N C N C C C P — — P C P — C N C C C C C P P C P C C P N C P C C C N P P N C C N C C C C P P P N N P C N C C C C C N C P N N C N C C C C C C C P 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 N P N C N C C P N C C P C C   N P N N C N N N P N P N N C N C C P P N C P C C P N N N P N N N N N N P C N P N C C — N P P N P C N N N C P N P N P N N C N C C C C P C N N N N N C N N C N P N C N C N N C C C C C C N C C C C N N N P P N P P P N N N C N C — C C — — — C N — P N N — P P 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

—

= no information

L

= controlled according to herbicide label

Chemical Legend

24D = 2,4-DB* (Butyrac) CLE = clethodim (Prism) DIU = diuron (Karmex, Direx) EPT = EPTC (Eptam) GLY1 = glyphosate (Roundup WeatherMax) HEX = hexazinone (Velpar)

IMA = imazethapyr (Pursuit) (highest rate) MET = metribuzin (Sencor) NOR = norflurazon (Zorial) PAR2 = paraquat* (Gramoxone Max) SET = sethoxydim (Poast) TRI = trifluralin1 (Treflan, Trilin)

Comments

*   Permit required from county agricultural commissioner for purchase or use.

1   For use in Roundup-ready 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 Co.
S. B. Orloff, UC Cooperative Extension, Siskiyou Co.
W. T. Lanini, Weed Science/Plant Sciences, UC Davis
R. G. Wilson, UC Cooperative Extension, Lassen Co.
R. N. Vargas, UC Cooperative Extension, Madera Co.
Acknowledgment for contributions to the weeds section:
C. E. Bell, UC Cooperative Extension, San Diego Co.
R. F. Norris, Vegetable Crops/Weed Science, UC Davis
J. L. Schmierer, UC Cooperative Extension, Colusa Co.

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