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How to Manage Pests
UC Pest Management Guidelines
Carrot
Herbicide Treatment Table
(Reviewed 10/05,
updated 10/05)
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In this Guideline:
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More about weeds in carrot:
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| Herbicide |
Amount/Acre
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P.H.I.+ |
| (trade name) |
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(days) |
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| PREPLANT |
| A. |
METAM SODIUM 42% product |
37.5–75 gal |
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COMMENTS: Soil should be free of large
clods and irrigated about 2 weeks before application of the metam sodium. For
flood applications, meter metam into water continuously throughout the entire
irrigation. Sprinkler applications are much quicker; after running the
sprinklers 5–10 minutes to moisten the soil surface and to be sure the system
is working properly, inject the total amount of metam into the pump in about
20 minutes, then shut off the system. In any chemigation system, it is very
important to have controls in place to prevent water flowing backward into
the uncontaminated water source. Fumigants, such as metam sodium and
1,3-dichloropropene, are a prime source of volatile organic compounds (VOCs),
which are a major air quality issue. Fumigate only as a last resort when
other management strategies have not been successful or are not available.
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| B. |
PARAQUAT* |
0.49–1
lb a.i. |
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(Gramoxone Max) |
1.3–2.7 pt |
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COMMENTS: A nonselective foliar
herbicide that kills emerged weeds. Can be used before planting or after
planting, but before the crop emerges. Any crop plants exposed to the spray
will be killed, even germinating seed in the crook stage. No soil residual
activity. Use the lower rate on small broadleaf weeds, the higher rate on
larger weeds and grasses. Highly toxic if ingested, inhaled, or through
dermal contact; wear protective clothing. More active on warm, sunny days.
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| C. |
GLYPHOSATE |
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(Roundup) |
1–4 lb
a.i. (1–4 qt) |
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...OR... |
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(Touchdown) |
0.375–3.75
lb a.i. (0.5–5 qt) |
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COMMENTS: A nonselective, foliar
herbicide applied to premade beds before planting to kill emerged weeds.
Allow 3 days after treatment before planting. Use the lower rate for annual
grasses and weeds, the higher rate on perennial weeds. Consult the label for
specific recommendations on particular weed species. Do not apply to weeds
stressed for moisture. For perennial weeds, allow 7 days after application
before cultivating.
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| D. |
TRIFLURALIN |
0.5–1 lb a.i. |
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(Treflan HFP) |
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COMMENTS: Controls annual grasses and
broadleaf weeds. Incorporate mechanically into the top 2–3 inches of the
final seedbed. The lower rates are recommended on sandy soil; however, crop
tolerance is excellent.
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POSTPLANT Before the crop emerges |
| A. |
TRIFLURALIN |
0.5–1 lb a.i. |
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(Treflan HFP) |
1–2 pt |
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COMMENTS: Apply after sowing to prevent
weed germination. Incorporate with irrigation water. See label for plantback restrictions. |
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| B. |
LINURON |
0.5–1 lb a.i. |
14 |
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(Lorox) 50DF |
1–2 lb |
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COMMENTS: Apply after planting,
incorporate with sprinklers. Will control many broadleaf weeds and annual
grasses. A postemergent treatment is also allowed, but must not exceed a
total of 3 lb linuron/acre/season.
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| After
the crop emerges
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| A. |
LINURON |
0.5–1 lb a.i. |
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(Lorox) 50DF, etc. |
1–2 lb |
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COMMENTS: May be applied twice, first
when the crop is 3 inches tall. Good control of emerged broadleaf weeds,
small grasses, and suppression of yellow nutsedge. Total per season must not
exceed 3 lb /acre (or 1.5 lb a.i./acre).
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| B. |
FLUAZIFOP-P-BUTYL |
0.32–0.96
lb a.i. |
45 |
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(Fusilade DX) |
16–48 fl oz |
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COMMENTS: A selective, foliar herbicide
for control of grasses. A surfactant (crop oil concentrate or nonionic
surfactant) is recommended. Safe to the crop. Not effective on
drought-stressed grasses or on certain species (e.g., annual bluegrass,
sprangletop). Do not apply more than 48 oz/acre/season.
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| C. |
SETHOXYDIM |
0.09–0.47
lb a.i. |
30 |
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(Poast) |
0.5–2.5 pt |
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COMMENTS: A selective, foliar herbicide
for control of grasses. A surfactant (crop oil concentrate or nonionic
surfactant) is recommended. Safe to the crop. Not effective on
drought-stressed grasses or certain species (e.g., annual bluegrass, sprangletop). |
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| D. |
CLETHODIM |
0.095–0.125
lb a.i. |
30 |
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13–17 fl oz |
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COMMENTS: Controls annual bluegrass in
the 2- to 3-leaf stage as well as other annual and some perennial grasses. Do
not apply through any type of irrigation system. Always apply with a crop oil
concentrate. Use higher rate on perennial grasses.
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UC IPM Pest Management Guidelines: Carrot
UC ANR Publication 3438
Weeds
R. F. Smith, UC Cooperative Extension, Monterey Co.
J. Nunez, UC Cooperative Extension, Kern Co.
G. J. Poole, UC Cooperative Extension, Los Angeles Co.
Acknowledgment for contributions to the weeds section:
C. E. Bell, UC Cooperative Extension, Imperial Co.
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