3.3 Blueberry Weed Management

PREEMERGENT

carfentrazone-ethyl

Aim EC

1 – 2 fl oz

0.016 – 0.031

Aim EW

May be applied as broad cast application during dormant stage of crop. Use as directed application for post-emergence weed control. Use lower rate for control of small weed seedling (2-3 leaf stage); use higher rate for control of larger weeds (up to 6 leaf stage). Applications beyond 6 leaf stage may result in only partial control. Requires NIS or COC².

dichlobenil

Casoron 4G

100 – 150 lb (annuals)

150 lb (perennials)

4 – 6

6

Casoron CS

1.4 to 2.8 gal

1.96 –3.92

Controls some perennial weeds that survive other preemergent herbicides, and controls later seedlings as well. Apply in late fall or early spring when daily temperatures hold below 45°F. Uniform application is essential. Casoron 4G must be applied using a device specifically designed for spreading, or applied by hand held shaker. Do not apply until 4 weeks after transplanting.

flumioxazin

Chateau SW

6 – 12 oz

0.188 – 0.38

Chateau WDG

6 – 12 oz

0.188 – 0.38

Preemergent applications must be completed prior to weed emergence. Do not apply more than 12 oz/A during a single application or during a 12 month period. Allow 30 days between applications. Note: A maximum rate of 6 oz/A per application should be used on any soil with sand/gravel content over 80% if the bushes are less than 3 years of age. Do not apply after onset of bloom. See label for details.

hexazinone

Velpar DF

1.3 – 2.6 lb

1 – 2

Velpar L

4 – 8 pt

1 – 2

Controls a broad range of annual and perennial broadleaf weeds. Apply in spring before lower leaves have fully expanded; avoid contact with leaves. Use higher rates in heavier soils and those with high organic matter. Do not use on plantings less than 3 years old. .

napropamide

Devrinol 50DF

8 lb

4

Devrinol 10G

40 lb

4

Apply in late fall or early spring before seedling weeds emerge. Incorporate within 24 hours of application with either cultivation or water. May be applied to newly planted and established crops.

†norflurazon

†Solicam 80DF

2.5 – 5 lb

4

Apply as a directed spray from fall to early spring before weeds emerge and when plants are dormant. Make only 1 application per year. Do not use in nurseries or in plantings less than 6 months old.

oryzalin

Surflan AS

2 – 6 qt

2 – 5

Surflan DF

2.4 – 7.1 lb

2 – 6

Apply late fall or in early spring before weed emergence. Do not apply to newly transplanted bushes until soil has settled and no cracks are present. Not recommended on high-organic soils. Rainfall or irrigation (1/2 - 1”) required within 21 days of application.

*pronamide

*Kerb 50W

2 - 4 lb

1 – 2

For both pre emergence and post emergence control of annual and perennial grasses, chickweed, red sorrel (from seed), and pre emergence control of certain broadleaf weeds. Apply in late fall or winter prior to soil freeze/snow cover. For optimum activity, apply under cool weather conditions (55 ^oF or less), followed by rainfall or overhead irrigation. Do not use on high-organic soils or newly transplanted blueberries until roots are well established. Make only 1 application per year; do not apply at rates higher than 4 lb/A (2 lb AI/A).

simazine

Princep Caliber 90WDG

2.2 – 4.4 lb

2 – 4

Princep 4L

2 – 4 qt

2

For control of annual weeds and quackgrass. Apply in early spring before weeds germinate or at a low rate in both spring and fall. Use half the above rate on plantings less than 6 months old. Do not apply when fruit is present.

*terbacil

*Sinbar 80WP

2 – 3 lb

1.6 – 2.4

Use only in plantings 1 or more years old. Apply in spring when weeds are germinating or small, or in fall after harvest. Avoid berry foliage.

carfentrazone-ethyl

Aim EC

1 fl oz. (weeds at 2 – 3 leaf stage)

2 fl. oz (weeds up to 6 leaf stage)

0.016

0.031

Aim EW

For directed post-emergent burndown and control of many annuals and certain problem perennial weeds such as morning-glory, nightshade, bedstraw, and ferns. Do not use more than 6.1 oz per year. Use with COC or NIS². Aim will damage foliage if contact is made to the crop.

fluazifop-butyl

Fusilade DX +1% COC²

16 – 24 oz

0.25 – 0.375

Use on non-bearing crops only. Apply to actively growing grasses less than 8 inches tall. Do not apply to plants that will have harvestable fruit within one year.

flumioxazin

Chateau SW + 0.25% NIS or COC²

12 oz

0.38

Chateau WDG + 0.25% NIS or COC²

6 – 12 oz

0.188 – 0.38

Do not apply more than 12 oz/A during a single application or during a 12 month period. Allow 30 days between applications. Note: A maximum rate of 6 oz/A per application should be used on any soil with sand/gravel content over 80% if the bushes are less than 3 years of age. For some weeds, tank mixing with a labeled burndown herbicide is recommended. See label for details.

†glufosinate-ammonium

†Rely 200

77 fl oz (weeds < 8inches)

115 fl oz (weeds > 8 inches)

1.00

1.50

Controls a broad spectrum of emerged annual and perennial grass and broadleaf weeds, and certain woody species. Apply as a broadcast, banded or spot treatment application depending on the situation. Avoid direct drift onto desirable vegetation. Do not apply more than 230 fl oz/A per year. Do not graze, harvest and/or feed treated cover crops to livestock.

glyphosate¹

Roundup Original

1 – 3 qt

0.25 – 0.75

Roundup Original II

Roundup Original Max

Roundup Ultra

Apply to actively growing weeds when they are between 6 and 8 inches tall. Use for preplant preparation or as a directed spray on wiper application (20% solution). Avoid berry foliage or canes.

*glyphosate IPA plus carfentrazone-ethyl

*Rage

20 – 40 fl oz

0.78 – 1.56

0.006 – 0.012

May be applied as broad cast application during dormant stage of crop. Use as directed application for post-emergence weed control. Use lower rate for control of small weed seedling (2-3 leaf stage); use higher rate for control of larger weeds (up to 6 leaf stage). Applications beyond 6 leaf stage may result in only partial control. Applications should not be made within 6 - 8 hours or rain, irrigation, or heavy dews to avoid significant crop response. Do not allow spray mist to contact green stem tissue, desirable fruit, blooms or foliage. Requires NIS or COC.²

mesotrione

Callisto

3 – 6 fl oz

0.094 – 0.188

May be applied as a pre-bloom post-directed spray at a rate up to 6 fl oz/A. Split applications (3 fl oz/A) may also be used at no less than a 14-day interval. No more than 6 fl oz/A may be applied per crop per season. It is recommended Callisto be applied with 1% v/v COC² that is not injurious to blueberry leaves. Do not apply after the onset of bloom stage.

*paraquat

*Gramoxone Inteon

2 - 4 pt

0.5 – 1.0

Apply as a postemergent directed spray on weeds in a minimum of 50 gal/A with NIS or COC². Apply in spring after weeds emerge, but before new canes emerge. Apply as coarse spray to avoid crop injury from fine mist spray.

pelargonic acid

Scythe

3 – 5% solution for annuals

5 – 7% solution for perennials

7 – 10% solution for maximum burn down

2.25 – 20 gal

For use as vegetative burn down, directed/shielded sprays, Apply before new canes emerge in spring or after they become woody. Do not contact desirable foliage.

sethoxydim

Poast 1.5EC +

COC²

1.5 – 2.5 pt +

2 pt

0.28 – 0.47

Apply to actively growing grasses before tillering or seed head formation. Do not cultivate 5 days before or 7 days after application. Limited to 2 applications per year, or 5 pints per season.

¹Other glyphosate products may be labeled for the same purposes.

²NIS = non-ionic surfactant, COC = crop oil concentrate.

* = Restricted-use pesticide- may be purchased and used only by certified applicators or used by someone under the direct supervision of a certified applicator.

† = Not for use in Nassau and Suffolk Counties. Pesticide labels that indicate ‘Not for use on Long Island , NY’ mean that use is prohibited in Nassau and Suffolk Counties only.

NOTE: Herbicides are usually applied in a 3-4 ft band beneath the plants. Read the label.

Planting year

April

Roundup 30 days before planting. After weeds die, till to prepare for planting, unless planting into killed sod.

Till to prepare for planting unless planting into killed sod.

April - May

Devrinol before seedlings emerge. Till or water in within 24 hr.

Hand weed.

Mid-June after planting

Fusilade for perennial grasses.

Hand weed and mulch within row. Mow row middles and planting borders.

Mid-July

Hand weed or spot treat with Roundup.

Hand weed. Mow row middles and planting borders.

October

Low rate of Princep.

Hand weed. Mow row middles and planting borders.

November

Callisto¹ or Chateau¹ for broadleaves. *Kerb for grasses before ground freezes. Casoron for grasses and broad leaves- apply uniformly. All have different application requirements – check labels for details.

Hand weed. No late season mowing.

Fruiting year

March - April

Callisto, Casoron, Chateau, Devrinol, *Sinbar, Princep, Aim, *Rage, †Rely, or Velpar may be used in early spring for weed control. All have different application requirements – check labels for details.

Hand weed. Replenish mulch every 2-3 years.

Early May

*Gramoxone or Scythe before new cane emergence.

Hand weed. Mow row middles and planting borders.

Late July after harvest

Poast on actively growing grasses, spot treat with Roundup.

Hand weed. Mow row middles and planting borders.

September into October

*Sinbar (after harvest), Devrinol, †Solicam (if no spring application), Surflan, Princep.

Hand weed. Mow row middles and planting borders.

November

Callisto or Chateau for broadleaves. *Kerb for grasses. Casoron if needed for grasses and broadleaves. *Rage in the row if weeds are still actively growing. All have different application requirements – check labels for details.

Hand weed. No late season mowing.

¹Do not apply after onset of bloom.

* = Restricted-use pesticide- may be purchased and used only by certified applicators or used by someone under the direct supervision of a certified applicator.

† = Not for use in Nassau and Suffolk Counties. Pesticide labels that indicate ‘Not for use on Long Island , NY’ mean that use is prohibited in Nassau and Suffolk Counties only.