22. Resistance tip: Be timely. It's critical to control weeds like waterhemp and Palmer amaranth when they are small in the 2- to 4-inch stage. Waterhemp can grow 1 to 1½ inches per day, while Palmer amaranth can grow 2 to 3 inches per day. Waiting a day to control weeds like these can reduce control, notes Hager.
23. Pry open your pocketbook. Diversifying weed management can cost more, particularly if you already have a herbicide-resistance problem.
“At one time in the 1990s, three to four applications of glyphosate cost as little as $12 per acre,” says Haigwood. “Now, with the different herbicides we're applying, costs can run up to $65 per acre.”