In a petition filed on November 6, 2008, the Natural Resources Defense Council (NRDC) requested that EPA cancel all product registrations and revoke all tolerances (legal residue limits in food) for the pesticide 2,4-dichlorophenoxyacetic acid, or 2,4-D.

Purdue University researchers have discovered a fine-tuning mechanism involved in plant root growth that has them questioning whether a popular herbicide may have unintended consequences, causing some plants to need more water or nutrients.

The list of herbicide active ingredients available for pre-harvest applications in corn or soybeans is relatively short, says University of Illinois Extension weed specialist Aaron Hager.

There is still time to control weeds in fields that were not planted to crops this year due to wet weather, Ohio State University says.

Wet weather and delayed planting have several effects on no-till burndown programs, especially in soybeans.

The two winter annual weed species producing the purple patches in no-till fields around the Midwest are henbit and purple deadnettle.

Herbicides should be applied soon to minimize the impact of winter annual weeds on wheat growth and development, says Ohio State University experts.