Black berry removal

Asked May 14, 2014, 5:36 PM EDT

We need to remove a big area of established blackberries by the roots to minimize future growth? The property is in the scenic area of the Columbia River Gorge.

Multnomah County Oregon

1 Response

By the roots is not a good idea, the pieces left behind all make new plants, We recommend a systemic herbicide that kills the whole plant rhizomes and all. The seeds last years so repeat applications will be needed to maintain the area.

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Blackberry vines, wild (Rubus spp.)

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 Escort: 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 re-growth 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