A moderately toxic herbicide that requires protective gear for handling and application
Trade name(s) Diquat Herbicide, Reward, Reglone
Manufacturer(s) Syngenta
Formulation(s) 2 lb water-soluble cation/gal (3.73 lb/gal salt). Cation portion of the molecule is the active ingredient.
Remarks A fast-acting, nonselective, foliar-applied, contact herbicide and plant desiccant. Material is slightly translocated. It is completely inactivated on contact with soil. Using a surfactant enhances its activity.
Water solubility 700,000 ppm
Storage conditions Store above 32°F.
Acute toxicity LD50 - 125 mg/kg for mouse.
Action in plant Acts as contact. Absorbs energy produced by photosynthesis; forms peroxides that disrupt living cells.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium
Koc Average is 1,000,000 mL/g (estimated)
Tim Prather
Revised March 1, 2012
Total vegetation control with soil-residual herbicides is a process in which the addition of chemicals renders the soil unfit for plant growth. Soil-residual herbicides do not kill all animal and microbiological life in the soil.
Keep the following in mind when using soil-residual herbicides:
Ed Peachey
Revised December 29, 2010
diquat (Reglone)
Rate 0.5 lb ai/A
Time Apply any time when weeds are small and actively growing.
Remarks Avoid spray contact with desirable ornamental plants. Acts as a contact; absorbs electrons after photosynthesis and recycles herbicide.
Ed Peachey
Revised January 3, 2011
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 one herbicide is 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 March 1, 2012
SITE PREPARATION
soil fumigants
See the current edition of the PNW Plant Disease Management Handbook for application details and approved materials.
glyphosate (several product names)
Rate Consult labels
Ed Peachey
Revised March 1, 2012
(Note: Some clones may be sensitive to certain herbicides)
GRAPES—Weed and Vegetation Management
Pamela J.S. Hutchinson
Revised September 1, 2011
POTATOES—Volunteer Grain, Weed, or Grass Cover Crop Control before Planting Potatoes
carfentrazone (Aim EC)
Rate Up to 0.031 lb ai/A (2 fl oz Aim EC)
Time Apply before potatoes have been planted.
Andrew Hulting
Revised December 1, 2011
CLOVERS—Red, White, Ladino, 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.
Tim Miller
Revised September 1, 2011
In some seed-producing regions, contracting seed companies or seed associations have secured special local needs (SLN) labels for members. These labels may not be listed here because the authors of this handbook wish to honor the third-party ownership of these labels and their restricted use. SLNs for Syngenta products are only found on the website farmassist.com, therefore we have included specific directions in the text of each section on how to access these labels, or we have at least referenced other sections where that information is available.
Vanessa Howard Morgan
Revised September 1, 2011
In many ways, aquatic weeds are similar to terrestrial or land weeds. There are annuals and perennials. Many flower and produce seed, others propagate only asexually. Some produce tubers or winter buds, some are more shade tolerant than others, and nearly all respond to fertilization. Therefore, the management and control of these pests is similar in many respects to that of land weeds.
Ed Peachey, Tim Miller, and Andy Hulting
Revised March 1, 2012
This information provides specifications for users of this handbook. For more information regarding the physiological or biochemical activity and behavior in or on soils, refer to the Herbicide Handbook of the Weed Science Society of America.
