Not all registered pesticides are listed. The following are listed alphabetically. When choosing a pesticide, consider information relating to environmental impact, resistance management, the pesticide’s properties, and application timing. Tank mixes may be necessary to achieve desired control; see Susceptibility of Weeds to Herbicide Control for information on specific weed control. Always read the label of the product being used.
BEFORE PLANTING
A.
GLYPHOSATE
2 lb a.i.
(Roundup)
1.45 qt
4
NA
WSSA MODE OF ACTION GROUP NUMBER1: 9
. . . or . . .
(Touchdown)
0.9375 lb a.i.
1.25 qt
12
NA
COMMENTS: Apply to seedling weeds before seeding or before celery emergence.
B.
OXYFLUORFEN
0.25–0.5 lb a.i.
(Goal) 2XL
1–2 pt
24
NA
WSSA MODE OF ACTION GROUP NUMBER1: 14
COMMENTS: Apply to fallow beds at least
30 days before transplanting. After application, thoroughly work the fallow beds to a depth of at least 2.5 inches before planting.
C.
PELARGONIC ACID
(Scythe)
Label rates
12
NA
MODE OF ACTION: Unknown.
D.
TRIFLURALIN
0.5–1 lb a.i.
(Treflan) HFP
1–2 pt
12
NA
WSSA MODE OF ACTION GROUP NUMBER1: 3
COMMENTS: Preplant incorporate 2–3 inches deep. Use high rate on clay soils.
BEFORE TRANSPLANTING
A.
BENSULIDE
5–6 lb a.i.
(Prefar) 4-E
5–6 qt
12
0
WSSA MODE OF ACTION GROUP NUMBER1: 8
B.
PROMETRYN 4L
1–2 lb a.i.
24
0
WSSA MODE OF ACTION GROUP NUMBER1: 5
COMMENTS: Apply only 1 application in a
minimum of 20 gal water/acre during the 2- to 6-week period before
transplanting. Application may be made over the celery. Apply before weeds
are 2 inches tall. On coarse-textured soils and low organic matter soils,
make one application of 2–4 pt/acre. On fine-textured soils, use
3.2–4 pt/acre. Make the application up to 21 days before transplanting.
Note: A post-transplant application is not allowed if the pre-transplant application was made at the maximum allowable use rate of 4 pt/acre.
C.
S-METOLACHLOR
0.64–1.27 lb a.i.
24
62
(Dual Magnum 7.63)
WSSA MODE OF ACTION GROUP NUMBER1: 15
COMMENTS: Apply as a
preplant surface applied or preplant incorporated application before
transplanting. It can also be applied post-transplant as a directed spray or
as a broadcast postemergent application. Rate applied depends on the texture
of the soil with lower rates applied to coarse-textured soils and higher
rates to finer-textured soils. Multiple applications are allowed but the season total cannot exceed 2 pt/acre.
AT PLANTING (DIRECT-SEEDED)
A.
BENSULIDE
5–6 lb a.i.
(Prefar) 4-E
5–6 qt
12
NA
WSSA MODE OF ACTION GROUP NUMBER1: 8
B.
PROMETRYN 4L
1.2–1.6 lb a.i.
24
NA
WSSA MODE OF ACTION GROUP NUMBER1: 5
COMMENTS: Apply after seeding.
Sprinkler irrigate within 48 hours. Apply at least 1 inch of water. Do not use on sand or loamy sand.
AFTER PLANTING
A.
CARFENTRAZONE
0.00742–0.031 lb a.i.
12
0
(Shark)
0.5–2 fl oz
WSSA MODE OF ACTION GROUP NUMBER1: 14
COMMENTS: May be applied to the furrows
between the rows using a hooded sprayer. Do not apply more than 6.1 oz/acre
(0.096 lb a.i./acre) per crop season. Weed should be less than 4 inches tall
and rosettes less than 3 inches across. Care must be taken to avoid contact
with the crop. A spray adjuvant such as nonionic surfactant, methylated seed oil, or crop oil concentrate is required.
B.
CLETHODIM
0.09093–0.12125 lb a.i.
24
30
(Select Max)
12–16 fl oz
WSSA MODE OF ACTION GROUP NUMBER1: 1
COMMENTS: Use an approved crop oil concentrate at 1% (volume by volume).
C.
LINURON
0.75–1 lb a.i.
(Lorox) DF
1.5–2 lb
24
67
WSSA MODE OF ACTION GROUP NUMBER1: 7
COMMENTS: Use only on transplants; do
not use after celery is 8 inches high. Do not apply in less than 20 gal
water/acre by ground. Rate is determined by the size of the weed and soil
type. With younger weeds lower rate may be used. May cause detectable plant
injury if warm weather follows application, but celery usually outgrows the injury without a significant reduction in yield or quality.
D.
PROMETRYN 4L
1–2 lb a.i.
24
45
WSSA MODE OF ACTION GROUP NUMBER1: 5
COMMENTS: For transplanted celery;
apply during the 2- to 6-week period after transplanting. Actual dosage will
depend on soil texture; use lower rate on coarse-textured soils. DO NOT USE
SURFACTANT. Apply before weeds are 2 inches tall. May cause detectable plant
injury if warm weather follows application, but celery usually outgrows the injury without a significant reduction in yield or quality.
E.
SETHOXYDIM
0.1875–0.28 lb a.i.
12
30
(Poast)
1–1.5 pt
WSSA MODE OF ACTION GROUP NUMBER1: 1
COMMENTS: Apply when celery has at least 2 true leaves. Use an approved oil concentrate at 2 pt/acre.
‡
Restricted entry interval (REI) is the number of
hours (unless otherwise noted) from treatment until the treated area can be
safely entered without protective clothing. Preharvest interval (PHI) is
the number of days from treatment to harvest. In some cases the REI exceeds
the PHI. The longer of two intervals is the minimum time that must elapse before harvest.
NA
Not applicable.
1
Group numbers are assigned by the Weed Science Society of America (WSSA) according to different modes of action. Although weeds may exhibit multiple resistance across many groups, mode-of-action numbers are useful in planning mixtures or rotations of herbicides with different modes of action.
Text Updated: 06/09
Treatment Table Updated: 06/09