When a weed species becomes resistant to a herbicide, it eliminates an entire class of available products. For commercial vegetable growers, who have few herbicide choices to begin with and few new products being registered, weed resistance poses a particularly serious threat to their weed management options.
The key to delaying the development of weed resistance is through careful herbicide selection for the entire crop rotation. For a handy overview of available products, turn to this 2' x 3' poster during the planning process (1 page).