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
Rick Boydston
Revised March 2013
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
Ed Peachey
Revised June 2012
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.
Ed Peachey
Revised June 2012
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
diquat (Reward)
Ed Peachey
Revised June 2012
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.
Ed Peachey
Revised June 2012
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.
Joe DeFrancesco
Revised March 2013
KIWIFRUIT—Weed and Vegetation Management
Joe DeFrancesco
Revised March 2013
Boysenberry; Loganberry; blackberries (Marion, Evergreen and other cultivars); and red and black raspberries
BLACKBERRIES AND RASPBERRIES—Site Preparation
glyphosate (numerous product names)
Rate Consult labels
Rick Boydston
Revised March 2013
MINT—Annual Grass and Broadleaf Weeds in New Plantings and Established Crop
sulfentrazone (Spartan 4F)
Rate 0.14 to 0.375 lb ai/A (4.5 to 12 fl oz/A product)
Rick Boydston
Revised March 2013
HOPS—Annual Grass and Broadleaf Weeds
flumioxazin (Chateau WDG)
Rate 0.19 lb ai/A (6 oz 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.
Andrew Hulting
Revised December 2012
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.
