Southeastern U.S. Vegetable Crop Handbook - 2023 - 326

WEED CONTROL
TABLE 4-1. CHEMICAL WEED CONTROL ASPARAGUS (CONT'D)
Weed
Herbicide,
Mode of Action Code*
and Formulation
green foliage, stale
bed
paraquat, MOA 22
(Parazone) 3 SL
(Gramoxone SL) 2 SL
Amount of
Formulation
Per Acre
Pounds Active
Ingredient
Per Acre
ASPARAGUS (seeded and new crown plantings), Preemergence
Contact kill of all
1.7 to 2.7 pt
2.5 to 4 pt
0.6 to 1
Precautions and Remarks
Apply to emerged weeds before crop emergence as a broadcast or band
treatment over a preformed row. Row should be formed several days ahead
of planting and treating to allow maximum weed emergence. Use a nonionic
surfactant at a rate of 16 to 32 oz per 100-gal spray mix or 1-gal approved
crop oil concentrate per 100-gal spray mix. Paraquat product labels require
applicators to take an EPA-approved training every 3 years to mix, load, and
apply paraquat.
Annual and perennial
grass and broadleaf
weeds, stale bed
application
Broadleaf weeds and
some annual grasses
glyphosate, MOA 9
(numerous brands and
formulations)
caprylic acid, MOA 26
(Homeplate)
See labels
See labels
Apply to emerged weeds before crop emergence. Row should be formed several
days ahead of planting and treating to allow maximum weed emergence.
Perennial weeds may require higher rates. The need for an adjuvant depends
on brand used.
See label
See label
May be applied prior to planting as a burndown treatment for emerged weeds,
as a preemergence application after seeding but before emergence, as a
directed or shielded application between rows or as a postharvest application.
Use higher spray volumes for high weed density and weeds larger than 5 in.
Coverage is important for acceptable weed control. May be tank mixed with
other herbicides. See label for further instructions.
Annual grasses and
small-seeded broadleaf
including Palmer
amaranth
linuron, MOA 7
(Lorox DF) 50 WDG
0.5 to 1
1 to 2 lb
Preemergence application. Plant seed 0.5 in. deep in coarse soils. Apply to
soil surface. See label for further instruction.
Postemergence application. Apply when ferns are 6 to 18 in. tall. Make one
or two applications, but do not exceed 2 lb active ingredient total per acre. Do
not use with fertilizer, surfactant, or crop oil, as injury will occur. Use the lower
rate on coarse soils. Not recommended on sand or loamy sand soils. PHI =
1 day.
Annual grasses and
certain broadleaf
weeds
pendimethalin, MOA 3
(Prowl H2
O) 3.8 AS
3.9
Up to 8.2 pt
ASPARAGUS (seeded and new crown plantings), Postemergence
Annual and perennial
grasses
clethodim, MOA 1
(Intensity One, Select
Max) 1 EC
(Arrow) 2 EC
fluazifop, MOA 1
(Fusilade DX) 2 EC
sethoxydim, MOA 1
(Poast) 1.5 EC
Annual grasses and
small-seeded broadleaf
weeds
linuron, MOA 7
(Lorox DF) 50 WDG
9 to 16 oz
6 to 8 oz
6 to 16 oz
0.3 to 0.5
1.5 to 2.5 pt
ASPARAGUS, (established at least 2 yr. old), Preemergence
0.5 to 1
1 to 2 lb
Apply before spear emergence or immediately after a cutting. Do not use a
surfactant or fertilizer solution in spray mixture. Use the lower rates on coarse
soils. Not recommended for sand or loamy sand soils. Repeat applications
may be made but do not exceed 4 lb per acre per year. Lorox can also be
applied as a directed spray to the base of the ferns. Lorox will also control
emerged annual broadleaf weeds up to 3 in. tall. PHI = 1 day.
napropamide, MOA 15
(Devrinol, Devrinol DF XT)
50 DF
(Devrinol 2-XT) 2 EC
trifluralin, MOA 3
(Treflan, Trifluralin, Treflan
HFP, Treflan) 4 EC
4
8 lb
2 gal
0.5 to 2
1 to 4 pt
Apply to the soil surface in spring before weed and spear emergence. Do not
exceed 8 lb per acre per year. See XT labels for information regarding delay
in irrigation event.
In winter or early spring, apply to dormant asparagus after ferns are removed
but before spear emergence, or apply after harvest in late spring or early summer.
In a calendar year, the maximum rate is 2 pt per acre for coarse soils,
3 pt on medium soils and 4 pt on fine soils. See label for further restrictions
on rates for soil types and on split application. Apply at least 14 d prior to the
first spear harvest or after final harvest. Do not apply over the top of emerged
spears or severe injury may occur. Do not apply more than 2.4 pt per acre in
sandy soils. PHI = 14 days.
pendimethalin, MOA 3
(Prowl H2
O) 3.8 AS
* Mode of action (MOA) code developed by the Weed Science Society of America.
See labels
See labels
Apply at least 14 days prior to the first spear harvest or after seasonal harvest
is complete. Do not apply over the top of emerged spears as severe injury
may occur. Do not apply at a rate of 2.4 pt per acre in sandy soils. See label
for more information. PHI = 14 days.
0.07 to 0.125
0.094 to 0.125
0.1 to 0.25
Newly planted crown asparagus only. Do not apply to newly seeded asparagus.
Newly planted crowns must be covered with at least 2 to 4 in. of soil
prior to application. Do not apply Prowl H2
sandy soils. See label for more information.
Apply to emerged grasses. Consult the manufacturer's label for best times to
treat specific grasses. Refer to label for adjuvant and rate. Adding crop oil to
Poast may increase the likelihood of crop injury at high air temperatures. With
fluazifop, add 1 qt of nonionic surfactant or 1-gal crop oil concentrate per 100gal
of spray mix. PHI for Select Max is 21 days and for Arrow 2 EC is 1 day.
O at more than 2.4 pints per acre in
326
2023 Vegetable Crop Handbook for Southeastern United States
Southeastern U.S. Vegetable Crop Handbook - 2023

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