Several weeds are usually cited by growers as problem species. As a general rule, always look for new or unusual weed species in fields. Attempt to cultivate or hand remove these weeds before seeds are produced. Following is some information on the most troublesome weeds with suggestions for control. Specific recommendations for any herbicides mentioned below can be found in the tables that follow.
Common Chickweed (Stellaria media): Common chickweed is a winter annual with an extended germination period. Germination can usually begin in late August or early September and continue into the next spring. Seeds are produced in late spring and early summer. 2,4-D is not effective on this weed and labeled rates of SinbarTM applied at mulching over emerged chickweed are generally ineffective. Cultivation is impractical since the most competitive weeds are in the strawberry row where they also receive good winter protection. Effective control can be achieved with an application of DevrinolTM in late August. Since DevrinolTM does not control emerged weeds, it is important to make the application before emergence. While DacthalTM can also control this weed from seed, residual activity is too short to make this application cost effective.
Field Pansy (Johnny jump-up) (Viola, spp.): This winter annual weed has become a serious problem for many growers. As with chickweed, germination is in the late summer, fall, and early spring. Cultivation is impractical in the strawberry row. Unfortunately, the weeds in the row are often better winter protected and produce more seed than those in the row middles. There is currently no postemergence herbicide control of this weed. The only herbicide that can provide effective control from seed (preemergence) is DacthalTM which should be applied in late summer; however, DacthalTM is rarely used in late summer because of its cost and short residual (4-6 weeks). Only the first flush can be controlled with this method. Until better control options become available, growers will continue to have serious problems with this weed.
Yellow Wood Sorrel (Oxalis, spp.): This weed is perhaps the most troublesome for many strawberry growers. Several species exist. Some are perennials and some are winter annuals. Seed production usually occurs during harvest with the plants “spitting” their seeds across the strawberry rows. This, of course, allows free spreading of this weed across the field. As with the above-mentioned weed species, germination can take place over several months making control difficult. 2,4-D provides good control of oxalis plants if they are small and not hidden under the strawberry foliage. Therefore a late fall application, prior to mulching over dormant strawberry plants, can be at least partially effective. A 2,4-D application prior to renovation is usually not effective since seed dispersal has already taken place. SinbarTM also has some activity on this weed. Splitting the annual use rate of SinbarTM into a renovation and late fall (dormant) application can also provide some control. This weed usually shortens the life of a planting due to its quick spreading habit.
Dandelion (Taraxacum officinale): While dandelion has been cited as a problem weed by many growers, acceptable control is possible. Dandelion is a “simple” perennial weed. Unlike other perennials, it does not spread by rhizomes, has a taproot, and uses seed dispersal as its primary method of reproduction. Seeds germinate in the fall and produce good size plants by November. None of the soil-applied herbicides currently registered in strawberry will control dandelion. The only effective control strategy is a late fall application of 2,4-D. This application must be made after the strawberry plants are dormant (no new growth, reddened leaves). If few plants are present, hand removal may be an option. Be sure, however, to remove the entire tap root or regrowth will occur.
The following Tables (24-26) provide information of on weed management and herbicide effectiveness in strawberries. Weeds can develop resistance to herbicides. The Weed Science Society of America (WSSA) developed a grouping system based on the mode of action of different herbicides. WSSA Group numbers can be used as a tool to choose herbicides in different mode of action groups so mixtures or rotations of active ingredients can be planned to better manage weeds and reduce the potential for resistant species. Any questions about specific weed problems or weed management strategies should be directed to your local University or Extension Specialist. See Integrated Pest Management for Strawberries in the Northeastern United States for details on alternative weed management strategies.
| HERBICIDE | POSTEMERGENCE | PREEMERGENCE | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Common Weeds |
Scythe1 | Gramoxone2 | Formula 403 | Poast4 | Select4 | Roundup Ultra9 | Spur11 | Devrinol5 | Dacthal6 | Sinbar7 | Goal8 | Chateau10 | Spartan12 |
| HRAC/WSSA Group: | 0 | 22 | 4 | 1 | 1 | 9 | 4 | 0 | 3 | 5 | 14 | 14 | 14 |
| PERENNIALS | |||||||||||||
| Canada thistle | P | P | G | N | N | E | E | N | N | N | N | N | N |
| clovers | P | P | E | N | N | E | G | N | N | F | N | F | F |
| curly dock | P | P | G | N | N | E | G | N | N | N | N | P | G |
| dandelion | P | P | E | N | N | E | G | N | N | F | N | G | P |
| goldenrods | P | P | G | N | N | E | N | N | N | P | N | P | P |
| quackgrass | P | P | N | F | G | E | N | N | N | P | N | P | P |
| red sorrel | P | P | E | N | N | E | G | N | N | F | N | F | F |
| yellow nutsedge | P | P | F | N | N | G | N | P | N | F | N | F | G |
| ANNUAL GRASSES | |||||||||||||
| barnyardgrass | F | E | N | E | E | E | N | E | G | F | F | F | F |
| fall panicum | F | E | N | E | E | E | N | E | F | F | F | F | F |
| large crabgrass | F | E | N | E | E | E | N | E | E | G | F | F | F |
| oats or rye (from mulch) | F | E | N | G | E | E | N | E | E | G | F | F | F |
| ANNUAL BROADLEAVES | |||||||||||||
| bedstraw | G | E | E | N | N | E | N | P | P | F | F | F | E |
| carpetweed | G | E | G | N | N | E | N | G | G | G | F | E | E |
| common chickweed | G | E | F | N | N | E | N | E | G | E | F | E | E |
| common lambsquarters | G | E | E | N | N | E | N | G | E | E | G | E | E |
| common purslane | G | E | G | N | N | E | N | G | G | G | E | E | E |
| corn speedwell | G | E | G | N | N | E | N | F | F | G | F | G | F |
| galinsoga | G | E | G | N | N | E | N | G | P | G | G | G | G |
| horseweed | G | E | G | N | N | E | G | N | N | G | G | G | F |
| prickly lettuce | G | E | E | N | N | E | G | E | P | E | G | E | G |
| redroot pigweed | G | E | E | N | N | E | N | G | E | G | E | E | E |
| shepherd’s purse | G | E | G | N | N | E | N | P | P | E | E | E | E |
| Virginia pepperweed | G | E | E | N | N | E | N | P | P | G | G | G | F |
| yellow wood sorrel | G | E | G | N | N | E | N | P | P | G | E | G | F |
E=90% control or better; G=75-90% control; F=50-75% control; P=5-50% control; N=less than 5% control.
1 Scythe (pelargonic acid); non-selective contact herbicide. See information on rates and timings earlier in this section.
2 Gramoxone (paraquat); Restricted use material; pesticide applicators license required. A contact burndown herbicide with no soil activity. May be fatal if swallowed or inhaled. Complete training found at: https://www.epa.gov/persticide-worker-safety/paraquat-dichloride-trainin.... Training must be completed a minimum of every 3 years. Excellent for use on emerged vegetation. Use between rows, with directed spray; use shields to prevent contact with non-target plants; extremely toxic to birds and wildlife.
3 Formula 40 (2,4-D); systemic broadleaf herbicide. Typically used just before renovation; allow 5 days before mowing; also can be used when strawberries are dormant on winter annuals and perennial broadleaf weeds. Never use an ester or low-volatile ester formulation.
4 Poast (sethoxydim); systemic grass herbicide; use on actively growing grasses; will not kill old established grasses. Use with crop oil, avoid applying on hot humid days.
Select (clethodim); systemic grass herbicide; use on actively growing grasses; will not kill old established grasses; improved activity over Poast on sool season and pereennial grasses. Use with crop oil; avoid spraying on hot humic days.
5 Devrinol (napropamide); preemergent selective herbicide, must be activated with water or cultivation. Application after renovation for summer annual weed control or in late summer for winter annual weed control. Application before mulching will control volunteer grain from mulch. Heavy rates can inhibit daughter plant rooting.
6 Dacthal (DCPA); preemergent selective herbicide, use after mulch removal in spring or in late fall; water or cultivation after application improves control. May be ineffective on cool heavy soils. Do not apply between bloom and harvest. Safe on new plantings.
7 Sinbar (terbacil); selective preemergent herbicide. Moisture is required to activate the chemical; also provides early postemergence control.
8 Goal (oxyfluorfen): selective preplant herbicide. Must be applied at least 30 days prior to transplanting. The soil must be worked to a depth of at least 2.5 inches prior to transplanting the crop. The use of a preemergence herbicide after transplanting is also recommended.
9 Roundup Ultra (glyphosate); non-selective preplant herbicide. Must be applied at least 30 days prior to transplanting. Provides control of most annual and perennial weeds. Application to perennial weeds should take place the fall prior to transplanting for best control.
10 Chateau (flumioxazin); preemergent and postemergent selective herbicide. Primarily used in the late fall, after strawberry plants become dormant. Used as an alternative at this time to Sinbar.
11 Spur (clopyralid); selective postemergent broadleaf herbicide. Use after harvest to control Canada thistle and other broadleaf perennials and some annuals. Only one application per season.
12Spartan (sulfentrazone); preemergent selective herbicide. Use before or just after planting, but before new growth emerges. Will damage new growth. Use to control broadleaf weeds and nutsedge.
| TRANSPLANT YEAR | |||
|---|---|---|---|
| Weed Problem | Herbicide | Rate/Acre | Comments and Limitations |
| PREPLANT WEED CONTROL | |||
| Many annual broadleaf weeds | (oxyfluorfen) Goal 2XL Group 14 |
1 - 2 pt | Must be applied at least 30 days prior to transplanting. The soil must be worked to a depth of at least 2.5 inches prior to transplanting the crop. No control is provided after the crop is planted. |
| Emerged annual and perennial weeds | (glyphosate) Roundup Ultra Group 9 |
1 - 5 qt | Must be applied to emerged weeds at least 30 days prior to transplanting. For annual weeds, good soil preparation will also control these weed species. For perennial weeds, this application should take place in the late summer or fall prior to planting. Application to perennial weeds in the spring will provide top kill only and the same can be accomplished with tillage. |
| Burndown of emerged weeds |
(carfentrazone) |
2 oz | Apply alone or with other herbicides or fertilizers as a burndown treatment at least 24 hours before transplanting. |
| Annual grasses and many broadleaf weeds |
(pendimethalin) Satellite Hydrocap |
1.5 - 3 pt
|
Prowl: Use before planting strawberries. Apply to the soil surface before planting to prevent the establishment of most annual grasses as well as suppressing several broadleaf weeds such as velvetleaf and purslane. Moisture is required to activate the herbicide, and it can be applied through an overhead irrigation system or shallowly incorporated. At least one day must elapse between application and planting, unless protective gear is worn. Only the H2O formulation of Prowl is labeled for strawberries. No more than 6 pints are to be used in any one season. Prowl H2O should not be used if plastic mulch will be applied. Satellite Hydrocap: Apply during dormant season, or at renovation prior to new growth emergence. May be applied during the growing season as directed spray between rows - do not allow contact with strawberry plants. |
| Many annual broadleaf weeds |
(sulfentrazone) Spartan 4F Group 14 |
4 - 8 oz | Apply prior to planting or just after planting but before new growth appears. May cause severe damage to new growth. Strawberry varieties vary in sensitivity. Provides control of many broadleaf weeds, including field pansy, groundsel and nutsedge. |
| PREEMERGENCE WEED CONTROL | |||
| Annual grasses and small seeded broadleaf weeds | (DCPA) Dacthal F Dacthal 75W Group 3 |
8 - 12 pt 8 - 12 lb |
Weak on ragweed, smartweed, and galinsoga. Apply at transplanting or after cultivating. Irrigation, rainfall, or shallow cultivation after application will improve control. |
|
(napropamide) Devrinol 2XT Devrinol DF-XT Group 0 |
2 - 4 lb 2 gal 8 lb |
Apply to weed-free soil after strawberry plants become established. Heavy rate after planting may inhibit rooting of daughter plants. Application in late summer will control winter annuals. Application in late fall will control annual grasses and volunteer grains until harvest. This material must be activated with rainfall, irrigation, or shallow cultivation within 24 hrs. Consider using the 2 to 4 lb rate twice, once in late summer and again just prior to mulching in late fall. | |
|
(pendimethalin) Satellite Hydrocap |
1.5 - 3 pt |
Apply a banded spray between rows of strawberries. Maintain a rate per treated area, not a rate per planted acre. Do not contact the strawberry plants including daughter plants. May also be applied as a banded spray between rows of plastic mulch. Do not exceed 6 pints per acre per year. No weed control is provided in the crop row.
|
|
| Broadleaf weeds, some grasses, and some suppression of perennial weeds | (terbacil) Sinbar 80WP Group 5 |
2 - 6 oz | During the planting year, Sinbar may be applied at 2 to 3 ounces per acre after transplanting but before new runners start to root. If strawberry plants have developed any new foliage prior to application, irrigation or rainfall (0.5 to 1 inch) is required to wash the Sinbar off the strawberry plants. In late summer or early fall, a second application may be made at 2 to 6 ounces per acre to control winter annual weeds. This application must also be followed by 0.5 to 1 inch of irrigation or rainfall to wash the Sinbar off the plants. A third application of 2 to 4 ounces per acre can be made, as usual, after the strawberry plants are dormant and just prior to mulching. For soils with at least 2% organic matter, there is no maximum amount per application; however, no more than 8 ounces of Sinbar can be applied per year. For soils with between 1 and 2% organic matter, a maximum of 4 ounces of Sinbar can be applied at any one time with an annual maximum of 8 ounces per acre. For soils with between 0.5% and 1 % organic matter, a maximum of 3 ounces of Sinbar can be applied at any one time with an annual maxumum of 6 ounces per acre. Sinbar will also provide early postemergence control of some weeds. See the label. |
| (flumioxazin) Chateau SW Group 14 |
3 oz | Apply as a banded spray with a hooded or shielded sprayer to row middles or between plastic. Do not contact the strawberry plants including daughter plants. Apply prior to weed emergence. As an alternative, may be applied as a broadcast spray in the late fall after strawberries are dormant. Although the activity of Chateau is primarily preemergence, this product also provides some postemergence broadleaf activity when a crop oil concentrate, at 1% v/v or non-ionic surfactant at 0.25% v/v is added. Do not exceed 3 oz per acre per year. | |
| POSTEMERGENCE WEED CONTROL | |||
| Emerged annual grasses and broadleaf weeds. Suppression of emerged perennial weeds between rows. |
(paraquat) *Gramoxone SL 2.0 Group 22 |
2 pt | Contact herbicide. Use with a non-ionic surfactant. Direct spray between rows using a shield to prevent contact with strawberry plants. Do not apply within 21 days before harvest or more than 3 times per season. |
| Emerged annual and most perennial grasses | (sethoxydim) Poast Group 1 |
1 - 2 pt | Effective on small, actively growing grasses. Do not apply to grasses under stress (e.g., drought). Add 1 qt of crop oil concentrate per acre. Application within 6 weeks of Sinbar may cause leaf injury. Applications on days that are unusually hot and humid will likely cause leaf burn. Avoid applications on these hot and humid days or delay application until late evening. |
| (clethodim) Select 2EC Selectmax 0.97EC Group 1 |
6 - 8 oz 12-16 oz |
Effective on small, actively growing grasses. Improved activity over Poast on cool-season and perennial grasses. Add 1qt/100 gal spray of crop oil concentrate. Repeat application at 14 days for perennial grasses. Can add ammonium sulfate at 2.5 lb/acre to improve activity on perennial grasses. Do not apply within 4 days of harvest. | |
| Emerged annual weeds and suppression of perennial weeds | (pelargonic acid) Scythe Fatty acid, Group 0 |
3 - 10% solution | Contact herbicide for burn down only. See Scythe comments below this table. See label for complete instructions. |
| ESTABLISHED PLANTINGS | |||
| Weed Problem | Herbicide | Rate/Acre | Comments and Limitations |
| PREEMERGENCE WEED CONTROL | |||
| Annual grasses and small seeded broadleaf weeds | (DCPA) Dacthal F Dacthal 75WP Group 3 |
8 - 12 pt 8 - 12 lb |
Weak on ragweed, smartweed, and galinsoga. Apply to weed-free soil in early spring after mulch removal or in late fall. Irrigation, rainfall, or shallow cultivation after application will improve control. Do not apply between first bloom and harvest. May be less effective on cool heavy soils. |
| (napropamide) Devrinol 50DF Group 0 |
4 - 8 lb | Apply to weed-free soil. Heavy rate after renovation may inhibit rooting of daughter plants. Application in late summer will provide preemergence control of winter annuals. Application prior to mulching will control annual grasses and volunteer grains until harvest. This material must be activated with rainfall, irrigation, or shallow cultivations within 24 hrs. May be applied more than once per year but do not exceed a total of 8 lbs per acre per year. Do not apply from bloom through harvest. Consider applying the 4-lb rate twice: Once in late summer and again just prior to mulching in late fall. | |
|
(pendimethalin) Satellite Hydrocap |
1.5 - 3 pt |
Apply a banded spray between rows of strawberries. Maintain a rate per treated area, not a rate per planted acre. Do not contact the strawberry plants, including daughter plants. May also be applied as a banded spray between rows of plastic mulch. Do not exceed 6 pints per acre per year. Do not apply within 35 days before harvest. No weed control is provided in the crop row. Satellite Hydrocap may be applied during dormant season, or at renovation prior to new growth emergence. May also be applied during the growing season as directed spray between rows - do not allow contact with strawberry plants. |
|
| Broadleaf weeds, some grasses, and some suppression of perennial weeds | (terbacil) Sinbar 80WP Group 5 |
2 - 8 oz | Will also provide early postemergence weed control. Apply at renovation, immediately after mowing and tilling but before new growth begins. A second application may be made in late fall, after strawberry plants become dormant, for additional control of winter annual weeds. DO NOT USE AT ANY OTHER TIME AS PLANT DEATH MAY RESULT. Do not apply more than 6-8 oz of Sinbar per acre per growing season depending on soil type. Use only on plants established 6 months or longer. Do not use on soils with less than 0.5% organic matter. Following the establishment year, applications can only be made just after renovation and just prior to mulching. Applications are now allowed, however, on soils with between 0.5% and 2% organic matter using the same guidelines for rates as above. As always, be careful with Sinbar in strawberries, especially with potential overlap of sprayer passes which will double the rate and increase the potential for injury in some varieties. Please consult the supplemental label for additional information, rates, precautions, etc. |
| (flumioxazin) Chateau SW Group 14 |
3 oz | Apply as a banded spray with a hooded or shielded sprayer to row middles or between plastic. Do not contact the strawberry plants including daughter plants. Apply prior to weed emergence. Application after fruit set may result in spotting of fruit and should be avoided. As an alternative, may be applied as a broadcast spray in the late fall after strawberries are dormant. Although the activity of Chateau is primarily preemergence, this product also provides some postemergence broadleaf activity when a crop oil concentrate, at 1% v/v or non-ionic surfactant at 0.25% v/v is added. Do not exceed 3 oz per acre per year. | |
| POSTEMERGENCE WEED CONTROL | |||
| Emerged annual grasses and broadleaf weeds, Supression of emerged perennial weeds between rows |
(paraquat) *Gramoxone SL 2.0 Group 22 |
2 pt | Contact herbicide. Use with a non-ionic surfactant. Direct spray between rows using a shield to prevent contact with strawberry plants. Do not apply within 21 days before harvest or more than 3 times in a season. |
| Emerged annual and most perennial grasses | (sethoxydim) Poast Group 1 |
1 - 2.5 pt | Effective on small actively growing grasses. Do not apply to grasses under stress (e.g., drought). Add 1 qt of crop oil concentrate per acre. Application within 6 weeks after Sinbar may cause leaf injury. Avoid applications on days that are unusually hot and humid. Do not apply within 7 days before harvest or use more than 2.5 pints per acre per season. |
| (clethodim) Select 2EC Selectmax 0.97EC Group 1 |
6 - 8 oz 12-16 oz |
Effective on small, actively growing grasses. Improved activity over Poast on cool-season and perennial grasses. Add 1qt/100 gal spray of crop oil concentrate. Repeat application at 14 days for perennial grasses. Ammonium sulfate at 2.5 lb/acre may be added to improve activity on perennial grasses. Do not apply within 4 days of harvest. | |
| Most emerged broadleaf weeds including dandelion | (2,4-D) Formula 40 Group 4 |
2 - 3 pt | Apply at renovation, immediately after last harvest. Wait 3 to 5 days before mowing. May also be used in late fall after strawberries are dormant for control of certain winter annual, biennial, and perennial weeds. Be sure that strawberry plants are dormant (i.e., no new growth and reddened leaves) to avoid injury. |
| Emerged annual weeds and supression of perennial weeds |
(pelargonic acid) Group 0 |
3 - 10% solution | Contact material for burn down only. See Scythe comments below this table. See label for complete instructions. |
| (carfentrazone) Aim EC Group 14 |
2 oz | May be applied with a hooded sprayer between rows on bare ground or plastic systems. DO NOT apply over strawberry plants. DO NOT apply more than 6.1 oz/acre/season. | |
| Selected emerged broadleaf weeds including dandelion, Canada thistle, clover, vetch, ragweed, and jimsonweed | (clopyralid) Spur Group 4 |
2/3 pt | Make one application per crop year after harvest to emerged weeds. Apply uniformly with ground equipment in a minimum of 10 gallons of water per acre. Do not tank mix with any other herbicides. Only this clopyralid product is registered for strawberry, other similar products with other trade names are NOT registered in New England. Do not use any spray additives. |
|
†Where brand names for chemicals are used, it is for the reader’s information. No endorsement is implied, nor is discrimination intended against products with similar ingredients. Please consult pesticide product labels for rates, application instructions and safety precautions. Users of these products assume all associated risks. OMRI listed for certified organic production |
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Scythe (pelargonic acid)
Note: General - Scythe herbicide is part of EPA’s reduced-risk pesticide strategy. Scythe is a contact, non-selective, broad spectrum, foliar-applied herbicide. It controls only actively growing emerged green vegetation. It provides burndown of both annual and perennial grass and broadleaf weeds as well as most mosses. The degree of burndown and the longevity of control is less when the weeds are inactive, mature, or biennial/perennial types. The herbicide is not translocated; it will burn only those plant parts that are coated with the spray solution. Visible effects on most weeds occur within hours. This product does not damage non-green, woody parts of plants. Cool weather following treatment may slow the activity of this herbicide and delay or reduce visual effects. The burndown activity is similar to that of Gramoxone (paraquat). DO NOT contact desirable crop plants or damage will occur.
Crop application timing and registration - For most small fruit crops, applications can be made in a number of ways: Vegetative Burndown: General control of weeds for site preparation, non-crop, and around aquatic sites. Prior to Crop Emergence: Be sure that applications are made before crop emerges from soil or crop injury will occur. Directed and Shielded Sprays: Applications may be made in and around desirable plants as long as contact of foliage and green bark is avoided. Use of a shield is highly recommended. Sucker Control, Pruning, and Trimming: To burn back unwanted foliage growth on vines and excessive cane growth in brambles. Apply only to unwanted vegetative parts. Apply before suckers become woody. The current label for Scythe herbicide allows application in the following small fruit crops: blackberry, blueberry, boysenberry, cranberry, currant, dewberry, grape (all types), loganberry, raspberry, and strawberry.
Rates - Use a 3-5% solution for annual weeds (4-6 oz/gal water), a 5-7% solution for biennial and perennial weeds (6-9 oz/gal water), and 7-10% solution for maximum burndown (9-13 oz/gal water). Delivery rate for boom applications should be 75 to 200 gallons of spray solution per acre. For hand-held equipment, spray to completely wet all weed or plant foliage but not to the point of runoff. Repeat applications as necessary. Tank mixes are allowed with this product. These include tank mixes with glyphosate (Roundup), sulfosate (Touchdown), and residual herbicides. SEE THE LABEL FOR COMPLETE DETAILS!
Sinbar 80 WP (terbacil) - During the planting year, Sinbar may be applied at 2 to 3 ounces per acre after transplanting but before new runners start to root. If strawberry plants have developed any new foliage prior to application, irrigation or rainfall (0.5 to 1 inch) is required to wash the Sinbar off the strawberry plants. In late summer or early fall, a second application may be made at 2 to 6 ounces per acre to control winter annual weeds. This application must also be followed by 0.5 to 1 inch of irrigation or rainfall to wash the Sinbar off the plants. A third application of 2 to 4 ounces per acre can be made, as usual, after the strawberry plants are dormant and just prior to mulching.
For soils with at least 2% organic matter, there is no maximum amount per application; however, no more than 8 ounces of Sinbar can be applied per year. For soils with between 1 and 2% organic matter, a maximum of 4 ounces of Sinbar can be applied at any one time with an annual maximum of 8 ounces per acre. For soils with between 0.5 and 1% organic matter, a maximum of 3 ounces of Sinbar can be applied at any one time with an annual maximum of 6 ounces per acre.
Following the establishment year, applicaitons can only be made just after renovation and just prior to mulching. Applications are now allowed, however, on soils with between 0.5 and 2% organic matter using the same guidelines for rates as above. As always, be careful with Sinbar in strawberries, especially with potential overlap of sprayer passes which will double the rate and increase the potential for injury in some varieties. Please consult the new supplemental label for additional information, rates, precautions, etc.
Prowl H2O - Preemergence selective herbicide. Use pre-transplant for improved control of annual grasses and many broadleaf weeds during the transplant year. May also be used in row middles once strawberries are transplanted for control of weeds between the rows.
Chateau SW - Preemergence and postemergence selective herbicide. Use either between the crop row for preemergence control of many broadleaf weed and some grasses or use in the late fall after the crop is dormant for both preemergence and postemergence control of many weeds.
Spur - This is the only clopyralid product registered for strawberry in New England. Perennial strawberry only. For Canada thistle after harvest up to early fall, apply after the majority of basal leaves have emerged but prior to bud stage.
Fusilade DX - for control of annual and perennial grass species; will NOT control broadleaf weeds. One application permitted per year not to exceed 16 oz per acre. 14-day PHI.
Suppress EC - nonsystemic, nonselective postemergence foliar burndown herbicide for control of annual and perennial broadleaves and grasses. Best on newly emerged plants, less than 6 inches in height. OMRI-listed product.
Axxe - nonsystemic, nonselective postemergence, foliar burndown herbicide. Use higher rates on bigger plants. Very toxic to fish and invertebrates. Do not contaminate water resources during use. Eye irritant. OMRI-listed product.
| YEAR | TIMING | HERBICIDE OPTIONS | NON-HERBICIDE OPTIONS |
|---|---|---|---|
| PLANTING YEAR | |||
| Fall prior to planting | Roundup for emerged perennial weeds | Frequent tillage/tarping | |
| Prior to transplanting | Good soil preparation to control emerged weeds | Good soil preparation/flaming | |
| At planting | Sinbar to control broadleaf weeds Dacthal or Prowl to control annual grasses (Prowl must be applied prior to planting) |
Cultivate/handweed/flaming | |
| Mid-Summer | Poast or Select to control emerged grasses | Cultivate/handweed | |
| 4-6 weeks after planting | Devrinol at half rate | Cultivate/handweed | |
| Any time emerged weeds are present | n/a | Cultivate/handweed | |
| After crop dormancy | 2,4-D for emerged braodleaf weeds; Sinbar or Chateau preemergence for broadleafs; Devrinol at half rate for preemergence grass control | Mulch for winter protection | |
| FRUITING YEARS | |||
| Spring prior to bloom | Poast or Select for emerged grasses | Cultivate/handweed | |
| Renovation | 2,4-D or Spur for emerged broadleaf weeds; Mow 5-7 days later; Sinbar half rate for broadleaf weed control. | Cultivate/handweed/flaming | |
| After renovation through early fall | Spur for selected emerged broadleaf weeds | Cultivate/handweed | |
| Mid- to late-summer | Poast or Select for emerged grasses | Cultivate/handweed | |
| Late summer | Devrinol at half rate for preemergence grass control | Cultivate/handweed | |
| After crop dormancy | 2,4-D for emerged broadleaf weeds; Sinbar half rate or Chateau preemergence for braodleaf weeds; Devrinol at half rate for preemergence grass control. | Cultivate/handweed/mulching | |