PELARGONIC ACID

Trade name(s) Scythe

Manufacturer(s) Dow AgroSciences

Formulation(s) 4.2 lb/gal emulsifiable concentrate

Remarks A contact, nonselective, broad-spectrum, foliar-applied herbicide. Nonsystemic and no soil residual.

Water solubility Emulsifiable

Acute toxicity LD50 - greater than 5,000 mg/kg (low toxicity)

Action in plant Control or burndown of a broad spectrum of weeds on contact.

Site of action Group 26: unknown

Chemical family Carboxylic acid

Asparagus

Rick Boydston
Revised March 2015

ASPARAGUS—Seedbeds and Early Establishment

See “Section N. Vegetable Crops: Site Preparation, Stale Seedbeds, and Selective Postemergence Applications” for additional options for weed control during asparagus establishment.

clethodim (several trade names)

Rate 0.07 to 0.12 lb ai/A

Established Tree, Shrub, Rose, and Ground Cover Landscapes

Ed Peachey
Revised March 2014

Multiply rate by 0.023 for amount per 1,000 sq ft

geo-textiles

Available at agricultural and garden supply stores

Spun-bonded fabrics (non-woven) lightweight, extruded polypropylene fibers; requires mulch cover due to moderate UV light sensitivity; weed roots and rhizomes can penetrate fabric unless removed before establishment; cheapest option.

Greenhouse Floors

Ed Peachey
Revised December 2013

Diligent sanitation is the key to successful weed control inside greenhouses. Weed control also requires special precautions and the use of herbicides that have little or no chance to vaporize. Consequently, only a few herbicides are registered for use inside entirely enclosed greenhouses. Always turn off ventilation fans while applying postemergence herbicides, and avoid contact with desirable vegetation.

GREENHOUSE FLOORS

clethodim (Envoy)

Weed Control in Field-grown Nursery Stock

Ed Peachey
Revised December 2013

Weeds compete with newly planted nursery stock. Deep-rooted perennial weeds can reduce vigor and render a mature product unmarketable due to laws on transporting noxious weeds. Consequently, weeds are controlled with herbicides either broadcast-applied in closely spaced crops, or within the tree or shrub row for wider spaced crops, with alleys being mowed or flailed.

Weed Control in Container-grown Nursery Stock

Ed Peachey
Revised December 2013

Sanitation The first step to effective weed management is sanitation. Start with potting mixes that are free from weed seeds. Control weeds that have wind-dispersed seeds around the perimeter of the site. If weeds emerge in containers, remove them before they produce seeds. The more weed seed allowed to contaminate containers, the higher the probability that the weeds will germinate in areas where the herbicide barrier has been weakened or disrupted.

Kiwifruit

Joe DeFrancesco
Revised March 2015

KIWIFRUIT—Weed and Vegetation Management

General strategy The type of vine support structure and the method of irrigation influence weed management. Shade from pergolas reduces light available for weed germination and growth. A T-bar trellis may facilitate growth of perennial sods or winter cover crops between the kiwi rows for soil conservation. Drip irrigation reduces weed germination and growth within rows and in aisles. Minimize weed competition and interference within rows.

Blackberries and Raspberries

Joe DeFrancesco
Revised March 2015

BLACKBERRIES AND RASPBERRIES—Site Preparation

glyphosate (numerous product names)

Rate Consult labels

Remarks Apply to weeds at least 10 days before planting crop. Use highest rate on field bindweed. Do not apply if weeds are stressed by drought, weather, or maturity. Rain within 6 hours after application may reduce effectiveness. Inhibits production of three amino acids and protein synthesis.

Mint

Rick Boydston
Revised March 2015

MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop

napropamide (Devrinol 50 DF, Devrinol DF-XT, Devrinol 2XT)

Rate 4 lb ai/A (8 lb/A product)

Hops

Rick Boydston
Revised March 2015

HOPS—Annual Grass and Broadleaf Weeds

flumioxazin (Chateau SW)

Rate 0.19 lb ai/A (6 oz/A product).

Time Apply to dormant hops January thru March in a 1- to 1.5-foot band to each side of the hop row. Rain following application will improve preemergence weed control.

Clover Seed

Andrew Hulting
Revised March 2015

CLOVERS—Red, White, Crimson, and Arrowleaf

Preplant

benefin (Balan DF)

Rate 1.2 to 1.5 lb ai/A (2 to 2.5 lb/A Balan DF)

Time Before planting clover, benefin must be incorporated into the top 2 to 3 inches of the seedbed.

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