A single Palmer amaranth plant can produce as many as 5,00,000 seeds in one season, Marestail, about 2,00,000. Waterhemp generally produces 2,50,000 seeds per plant, but in non-competitive environments can produce as many as 1 million. Marestail seed is small enough to be carried for miles by the wind.
Developing herbicide resistant crops like one new herbicide-resistant variety, glufosinate-resistant soybean.
Genetically modified crops resistant to glufosinate were created by genetically engineering the bar or pat genes from streptomyces into the relevant crop seeds.
New weed management practices are needed to manage the consequences of long-term weed control.
Adoption of an Integrated Weed Management Approach
Rotate crops (particularly those with different life cycles)
Incorporate non-chemical weed control measures:
Scout fields regularly:
Scan the fields carefully to identify potential issues and eliminate weed escapes. Keep good records of weed populations.
Cleaning tillage and harvest equipment:
Prevent spread of resistant weeds by thoroughly cleaning tillage and harvest equipment as it moves from field to field. Also do not allow resistant weeds from total vegetation control areas (ie, fence rows, railroads, public utilities, etc) to spread to cropland.