*Farmers in the Rio Grande Valley had a tough summer.   *Texas corn farmers may produce less corn this year.   *The Environmental Working Group is suing Tyson Foods. *Last week’s interest rate cut will lower borrowing costs for farmers and ranchers.   *The Farm Bill extension expires in a week, and lawmakers are urging Congress to get something done.   *We are entering a new grazing season in Texas.   *September has been a dry month in the Texas Coastal Bend.   *Controlling intestinal parasites in foals is much different than in older horses.