Ed Peachey
Revised March 2022
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.
Caution A moderately toxic herbicide; protective gear required for handling and application. Do not ingest or inhale spray mist. Wear protective face shields, respirators, and clothing.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium
glyphosate (numerous product names)
Rate Spray: use 1.5 to 5 lb ai/A, or 1 to 2% solution for high-volume sprayers.
Time Apply as directed spray toward base of ornamental plant when weeds are actively growing or moving sugars to roots.
Remarks Use lower rates for annual weeds; see label for higher rates and timing for perennial weeds. Expedite Application Equipment contains a special formulation using small-droplet technology.
Caution Do not spray green foliage or green bark. If repeating applications, do not exceed a total of 10.6 lb ai/A (10.6 quarts) per year. Inhibits production of three amino acids and protein synthesis.
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted
glyphosate
Rate Wiper: use 33% solution.
Time Apply 1 gal product to 2 gal water and wipe weeds, avoiding contact with desirable vegetation. In severe infestations, reduce equipment ground speed or apply in two directions to ensure contact with wiper. (See remarks above.)
Site of action Group 9: inhibits EPSP synthase
Chemical family None generally accepted