Herbicide Plant-Back and Postemergence Restrictions for Forage Crops
ID
SPES-786NP
Introduction
The following charts summarize label and manufacturer guidelines for plant-back and early postemergence restrictions when establishing various forage crops. Users should always consult the product label for current restrictions prior to any herbicide application.
Herbicide |
Plant-Back Restrictions |
|---|---|
| 2,4-D LV4; Chaparral | 30 days |
Weedmaster |
10 days per 16 oz. |
Facet L; Quinstar 4L |
10 months |
Prowl H20 |
10-12 months for rates up to 4 pts.; 24 months for rates over 4 pts. |
NovaGraz |
14 days for rates up to 24 oz.; 45 days for rates over 24 oz. |
GrazonNext HL, Gunslinger- AMP; |
15 days at rates up to 1.5 pt.; 30 days for rates over 1.5 pt. |
DuraCor; |
15 days for rates up to 12 oz.; 45 days if over 12 oz. |
Milestone, Whetstone; |
15 days for rates up to 5 oz.; 45 days for rates over 5 oz. |
Plateau, Panoramic 2SL |
26-36 months, rate dependent |
| Crossbow, Crossroad; Remedy Ultra; Garlon 4 Ultra; Surmount | 3 weeks |
Clarity |
30 days per 16 oz. |
| Cimarron Plus, Chisum | 4 months for bluegrass, ryegrass, and tall fescue at rates up to 0.25 oz.; 2 months for smooth brome, meadow brome, and orchardgrass at rates up to 1.25 oz. |
Grazon PD3, Gunslinger P+D |
60 days for smooth brome. 21 days for all other species. |
| Glyphosate; PastureGard HL, Cleargraze; Stinger HL | No plant-back restrictions |
Herbicide |
Early Postemergence Restrictions |
|---|---|
Cimarron Plus, Chisum |
6 months for bluegrass, orchardgrass, and brome species, 12 months for timothy, and 24 months for tall fescue. It is not advisable to use on established timothy or tall fescue if stunting cannot be tolerated. |
| Crossbow, Crossroad; Facet L; Garlon 4 Ultra; Grazon PD3, Gunslinger P+D; Quinstar 4L; Remedy Ultra; Stinger HL; Surmount | Established plants only. Seedlings must be well established as indicated by 5 collared leaves, tillering, and development of a secondary root system. |
Prowl H20 |
Established plants only. Seedlings must have 6 or more tillers present. |
| 2,4-D LV4; Clarity; DuraCor; GrazonNext HL, Gunslinger AMP; Milestone, Whetstone; PastureGard HL, Cleargraze; Weedmaster | Seedlings must have a minimum of 3 collared leaves (V3). Under good growing conditions, V3 may be reached within 30 days after emergence. |
| Glyphosate; Plateau, Panoramic 2SL | Not labeled |
Chaparral |
Not recommended on tall fescue or timothy. Other species should reach tillering before any postemergence application. |
NovaGraz |
Tall fescue, orchardgrass, and timothy are tolerant of 24 fl oz/ac of this product once plants have developed 3 collared leaves. For other species or with higher rates, do not use until well established as indicated by tillering, development of a secondary root system, and vigorous growth. Not recommended for use on smooth brome. |
Herbicide |
Plant-Back Restrictions |
|---|---|
2,4-D LV4 |
90 days |
Grazon PD3, Gunslinger P+D; Surmount |
1 year |
Stinger HL |
10.5 months |
Clarity; Weedmaster |
120 days |
Facet L; Quinstar 4L |
24 months |
Plateau, Panoramic 2SL |
26-36 months for all species; rate dependent. Note that, once established, alfalfa and white clover are tolerant of rates up to 4 oz. |
| Remedy Ultra; Garlon 4 Ultra; NovaGraz; PastureGard HL, Cleargraze |
30 days |
| Cimarron Plus, Chisum | 4 months |
Prowl H20 |
6 months for rates up to 4 pints |
Crossbow, Crossroad; Milestone, Whetstone |
90 days |
| DuraCor; GrazonNext HL, Gunslinger AMP | At rates up to 1.5 pints, perennial clover can be (frost) seeded in the spring when applications are made no later than Sept. 15th. |
Chaparral |
At rates up to 2 oz., perennial clover can be (frost) seeded in the spring when applications are made no later than Sept. 15th. |
| Glyphosate | No plant-back restrictions |
Herbicide |
Plant-Back Restrictions |
|---|---|
2,4-D LV4 |
Labels vary, but generally 30 days. 30 days is common practice in VA. |
Clarity |
30 days per 16 oz. |
Weedmaster |
10 days per 16 oz. |
Quinstar 4L |
10 months |
Prowl H20 |
10-12 months for rates up to 4 pts.; 24 months for rates over 4 pts. |
NovaGraz |
14 days for rates up to 24 oz.; 45 days for rates over 24 oz. |
Milestone, Whetstone |
15 days for rates up to 5 oz.; 45 days for rates over 5 oz. |
| Grazon PD3, Gunslinger P+D; Remedy Ultra; Garlon 4 Ultra; Surmount; Crossbow, Crossroad | 3 weeks |
GrazonNext HL, Gunslinger AMP; Chaparral |
30 days |
DuraCor |
45 days |
| Glyphosate; Stinger HL; PastureGard HL, Cleargraze; Plateau, Panoramic 2SL |
No plant-back restrictions |
Cimarron Plus, Chisum; |
No plant-back restrictions for any species at rates up to 0.125 oz.; 1 month for switchgrass and 3 months for big bluestem or indiangrass at rates above 0.125 oz. |
Facet L |
No restrictions for switchgrass, but the best crabgrass control with Facet is achieved after the crabgrass has emerged. All other species are 10 months. |
Herbicide |
Early Postemergence Restrictions |
|---|---|
| 2,4-D LV4; Clarity; GrazonNext HL, Gunslinger AMP; Milestone, Whetstone | Established plants only. Seedlings must have a minimum of 3 collared leaves (V3). |
Cimarron Plus, Chisum |
Apply any time after emergence at a rate of up to 0.25 oz/ac. Can use up to 1.25 oz. after seedlings are established, as indicated by 5 collared leaves. |
Grazon PD3, Gunslinger P+D |
Apply only to established plants. Seedlings must be well established as indicated by 5 collared leaves. Applications during initial greenup in early spring could delay or suppress emergence. If temporary suppression of new growth cannot be tolerated, apply prior to greenup or after vigorous vegetative growth resumes. |
Plateau, Panoramic 2SL |
Do not use on switchgrass or eastern gamagrass. Big bluestem, little bluestem, and indiangrass must be well established as indicated by 5 collared leaves. |
| Weedmaster; Chaparral; Crossbow, Crossroad; DuraCor; PastureGard HL, Cleargraze; Prowl H20; Remedy Ultra, Garlon 4 Ultra; Stinger HL; Surmount; NovaGraz | Established plants only. Seedlings must be well established as indicated by 5 collared leaves, tillering, and development of a secondary root system. |
Quinstar 4L |
May be used in switchgrass at planting or as an early postemergence. Apply to other species only after seedlings are well established, as indicated by 5 collared leaves. |
Facet L |
No restrictions for switchgrass. Big bluestem, indiangrass, and little bluestem seedlings must be well established as indicated by 5 collared leaves. Eastern gamagrass is not mentioned. |
Glyphosate |
Not labeled |
Herbicide |
Plant-Back Restrictions |
|---|---|
2,4-D LV4 |
30 days |
Weedmaster |
10 days per 16 oz. |
Plateau, Panoramic 2SL |
12 months for rye and wheat. 18-24 months for oat or barley. |
PastureGard HL, Cleargraze |
No restrictions for annual ryegrass. All other species wait 120 days. |
Surmount |
3 weeks |
GrazonNext HL, Gunslinger AMP |
30 days for annual ryegrass. 1 year for other species. |
Clarity |
30 days per 16 oz. |
Cimarron Plus, Chisum |
4 months for annual ryegrass at rates up to 0.25 oz. |
Prowl H20 |
4 months for rates up to 4 pints. Presumably 1 month per pint thereafter. |
NovaGraz |
45 days |
Grazon PD3, Gunslinger P+D |
60 days |
Glyphosate; Stinger HL |
No plant-back restrictions |
| Chaparral; Crossbow, Crossroad; DuraCor; Milestone, Whetstone; Remedy Ultra, Garlon 4 Ultra | 30 days for annual ryegrass. All other species are not labeled. |
Facet L, Quinstar 4L |
Only wheat is labeled, and it can be planted immediately. |
Herbicide |
Early Postemergence Restrictions |
|---|---|
2,4-D LV4; Clarity |
Clarity should be tank-mixed w/ 2,4-d. Applications may be made within the 3-6 leaf stage only. |
Weedmaster |
Applications may be made within the 3-6 leaf stage only. |
| Chaparral; Cimarron Plus, Chisum; Crossbow, Crossroad; DuraCor; Facet L, Quinstar 4L Glyphosate; Grazon PD3, Gunslinger P+D; GrazonNext HL, Gunslinger AMP; Milestone, Whetstone; PastureGard HL, Cleargraze; Remedy Ultra, Garlon 4 Ultra; Surmount; Plateau, Panoramic 2SL | Not labeled |
Prowl H20 |
From the 1st leaf stage until the flag leaf is visible. |
Stinger HL |
Seedlings must have a minimum of 3 collared leaves (V3). |
NovaGraz |
Annual ryegrass is tolerant of 24 fl oz/ac once plants have developed 3 collared leaves. At rates >24 oz/ac, wait until annual ryegrass is well established as indicated by tillering. Not labeled for other species. |
Herbicide |
Plant-Back Restrictions |
|---|---|
2,4-D LV4 |
30 days |
Weedmaster |
10 days per 16 oz. |
Stinger HL |
10.5 months for sorghum. Other species not mentioned in label. |
Prowl H20 |
10-12 months for rates up to 4 pts; 24 months for rates over 4 pts. |
Surmount |
3 weeks for sorghum. Other species not mentioned in label. |
DuraCor |
30 days for rates up to 12 oz. for sorghum-sudangrass, teff, crabgrass, and pearl millet. When using higher rates or on other warm-season annual grass species, wait a minimum of 45 days. |
NovaGraz |
30 days for rates up to 24 oz. for sorghum-sudangrass, teff, crabgrass, and pearl millet. When using higher rates or on other warm-season annual grass species, wait a minimum of 45 days. |
GrazonNext HL, Gunslinger AMP |
30 days for rates up to1.5 pints for sorghum sudangrass, teff, crabgrass, and pearl millet |
Clarity |
30 days per 16 oz. |
Chaparral |
45 days for rates up to 2 oz. for sorghum-sudangrass, teff, crabgrass, and pearl millet. |
Grazon PD3, Gunslinger P+D |
8 months for sorghum. Other species not mentioned in label. |
PastureGard HL, Cleargraze |
No plant-back restrictions for rates up to 1.5 pints |
Glyphosate |
No plant-back restrictions |
| Cimarron Plus, Chisum; Crossbow, Crossroad; Milestone, Whetstone; Remedy Ultra, Garlon 4 Ultra | Not labeled |
Facet L, Quinstar 4L |
Only sorghum is labeled, and this can be planted immediately after application. |
Plateau |
Rate dependent: 18-24 months for sorghum. 26-36 months for all other species. |
Herbicide |
Early Postemergence Restrictions |
|---|---|
| 2,4-D LV4 | Apply to sorghum only between 6-15" tall. Sorghum hybrids vary in tolerance to 2,4-D. Apply to millet only when 4-8" tall. Other species are not mentioned. |
Clarity |
8 oz on sorghum from spike through 8" tall. Other species not mentioned in label. |
Facet L, Quinstar 4L |
May be applied anytime to sorghum up to 10" tall. Other species not mentioned in label. |
| Chaparral; Cimarron Plus, Chisum; Crossbow, Crossroad; DuraCor; Glyphosate; Grazon PD3, Gunslinger P+D; GrazonNext HL, Gunslinger AMP; Milestone, Whetstone; PastureGard HL, Cleargraze; Remedy Ultra, Garlon 4 Ultra; Stinger HL; Surmount; NovaGraz; Plateau, Panoramic 2SL | Not labeled |
Weedmaster |
Only within the 3-5 leaf stage. |
Prowl H20 |
Sorghum must be at least 4" tall. Other species not mentioned in label. |
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Publication Date
April 20, 2026
