Country star Gretchen Wilson has joined the lineup of stars for the Oct. 4 Farm Aid concert in Maryland Heights, MO.

Already slated to appear are Willie Nelson, Neil Young, John Mellencamp, Dave Matthews, Jason Mraz, Wilco, Jamey Johnson, Phosphorescent, Billy Joe Shaver, Will Dailey, Ernie Isley & the Jam Band, Ryan Bingham & the Dead Horses, The Blackwood Quartet, Lukas Nelson & Promise of the Real, and Titty Bingo.

DIRECTV will exclusively broadcast the event live and in HD on The 101 Network, beginning 5 p.m. ET. The company has also pledged to match customer donations up to $50,000 through Oct. 31.

Farm Aid 2009 will also be webcast and streamed live on the organization’s website, beginning 5 p.m. ET. To make a $5 donation that helps family farmers, text FARMER to 90999 during the concert. Click here to donate online. To follow the event on Twitter, click here.

A limited number of tickets are still available at livenation.com, the Verizon Wireless Amphitheater Box Office (877-598-8703) and participating Blockbuster stores.

“Farm Aid has deep roots in the Midwest that reach back to our first concert in Illinois in 1985,” says Willie Nelson, the organization’s president. “I’m looking forward to bringing my friends together on the Farm Aid stage to celebrate family farmers and the crucial work they do. Farmers do so much more than bring us the good food we all want to eat. America needs family farmers to revitalize our economy and make our country healthy.”

Presented by Horizon Organic, the event will once again feature HOMEGROWN concessions, with foods from regional family farms and local organic growers. The HOMEGROWN Village will host hands-on activities that give concertgoers a chance to meet family farmers and get their hands dirty.

“Family farmers are innovative entrepreneurs who safeguard our food, environment and health,” says Carolyn Mugar, Farm Aid’s executive director. “Since the beginning, Farm Aid has worked with family farmers in the Midwest to keep them on the land, especially in the face of factory farms that have threatened to take over food production. At Farm Aid, concertgoers will reap the benefits of this work and will experience food grown by Missouri’s family farms.”

Click here for information on Farm Aid’s petition against funding for factory farms.