paraquat (Gramoxone SL3.0, Parazone 3SL)
Rate 0.5 lb cation/A (1 to 2 pints/A)
Time Apply when corn is at least 10 inches tall with nozzles arranged to spray no higher than the lower 3 inches of corn stalks.
Remarks Apply by ground in at least 20 gal/A water, and add a nonionic surfactant or crop oil concentrate.
Caution A restricted-use herbicide. Corn plants shorter than 10 inches (measured from soil surface to top of whorl) may be injured and may not recover.
Site of action Group 22: photosystem I electron diversion
Chemical family Bipyridilium