Blackberry vines, wild (Rubus spp.)

aminocyclopyrachlor + metsulfuron methyl (Streamline)

Rate 3.8 to 4.5 oz/a aminocyclopyrachlor + 1.2 to 1.4 oz/a metsulfuron (9.5 to 11.5 oz/a of product)

Time Apply to actively growing woody plants.

Remarks Adjuvants can be used; these include methylated seed oils 0.5 to 1% v/v, nonionic surfactants at 0.25 to 1% v/v, and crop oil concentrates at 1% v/v. Can be applied using an invert emulsion rather than water. There are several application methods that dictate the amount of product to be mixed with the carrier, so consult the label. Controls many herbaceous species, in addition to woody species.

Caution Even low rates can kill nontarget tree and shrub species, so avoid application within a distance equal to the tree height of the sensitive species. Conifers can be injured, these include ponderosa pine, Douglas fir, Norway spruce, and white pine. Other trees that can be injured include aspen, Chinese tallow, cottonwoods, honey locust, magnolia, poplars, redbud, silver maple, and willow. Applications to stressed plants may reduce control. Do not allow spray to drift off target.

Site of action Group 4 synthetic auxin (aminocyclopyrachlor) Group 2: ALS inhibitor (metsulfuron methyl)

Chemical family (aminocyclopyrachlor) Pyrimidine carboxylic acid; (metsulfuron methyl) Sulfonylurea

glyphosate

Rate Broadcast: use 2.25 to 3 lb ae/a. Spot treat: use 1% to 1.5% solutions.

Time Apply in September to October when canes are actively growing and after berries are formed. Fall treatments must be made before a killing frost.

Remarks Fall spray treatment symptoms may not show before frost. Re-treatment may be necessary for complete control. Trailing blackberry is more difficult to control.

Caution Glyphosate controls grasses in the treated area as well as other vegetation.

Site of action Group 9: inhibits EPSP synthase

Chemical family None generally accepted

metsulfuron (Escort and others)

Rate 0.3 to 0.6 oz ai/a (0.5 to 1 oz/a)

Time Apply to fully leafed-out vegetation before fall leaf coloration.

Remarks Constantly agitate while mixing product in water. Add 0.25% by volume of nonionic or silicone surfactant to spray mixture. Good coverage is essential. Application sites differ between products; consult labels.

Caution Avoid contacting sensitive crops. Apply only to pasture, rangeland, and non-crop sites.

Site of action Group 2: acetolactate synthase (ALS) inhibitor

Chemical family Sulfonylurea

picloram (Tordon)

Rate 1 lb ae with 50 gal of water for spot treatment sprays

Time Apply in late spring after leaves are fully developed.

Remarks Foliage must be thoroughly wet. Reapplication will be required as regrowth occurs.

Caution Most formulations are restricted-use herbicides. Do not contaminate water. Potatoes, beans, and many other broadleaf crops are sensitive to picloram. Do not use picloram in diversified cropping areas.

Site of action Group 4: synthetic auxin

Chemical family Pyridine

triclopyr ester (Garlon 4) or triclopyr amine (Garlon 3A) or triclopyr + 2,4-D (Crossbow)

Rate Spot treatment: mix 3 lb ae Garlon 4 or 3.75 lb ae Garlon 3A with 100 gal water, or 1 pint Crossbow in 12 gal water. Broadcast: use 1 to 4 lb ae/a Garlon 4, or 1.5 to 4.5 lb ae/a Garlon 3A, or 1 to 2 gal/a Crossbow.

Time Apply when plants are actively growing. For dormant application, mix Garlon 4 in diesel oil or in water with 3% of an oil substitute.

Remarks Foliage must be thoroughly wet.

Caution Use on rights-of-way, industrial sites, and for forestry (release and site preparation). Crossbow can be used on permanent pasture and rangeland, up to 1.5 lb ae/a. Observe all grazing and harvesting restrictions.

Site of action (all) Group 4: synthetic auxin

Chemical family (triclopyr) pyridine; (2,4-D) phenoxy acetic acid