Consumer spending remains weak and continues to drag on the overall economy. As a result, big-name consumer stocks like Walt Disney (NYSE:DIS), Time Warner (NYSE:TWX) and Archer Daniels Midland (NYSE:ADM) continue to suffer.

I watch more than 5,000 publicly traded companies with my Portfolio Grader tool, ranking companies by a number of fundamental and quantitative measures. And this week, I’m tracking nine big consumer stocks that are taking a beating.

Here they are, in alphabetical order. Each one of these consumer stocks gets a “D” or “F” grade according to my research, meaning it is a sell:

Archer Daniels Midland is an agricultural commodities and packaged foods giant. The company has only slightly lagged the market, losing about 6% so far in 2011 as the market has tallied a 1% decline, but my research shows ADM stock is weakening.

Carnival (NYSE:CCL) is one of the biggest cruise lines in the world. Carnival also is one of the worst performers on Wall Street this year, with the stock off almost 30% since Jan. 1.

Lowe’s (NYSE:LOW), the home improvement giant, is suffering as the housing market has stayed beaten down. Lowe’s stock is off almost 19% year-to-date in 2011.

Panasonic (NYSE:PC) is a Japan-based electronics manufacturer that makes everything from audio equipment to plasma televisions to personal computers. This diversification hasn’t helped, as Panasonic is off over 26% so far in 2011.

Sony (NYSE:SNE) is another Japanese consumer stock that is suffering. Shares of Sony stock are off more than 40% year-to-date.

Sysco (NYSE:SYY) is a food service behemoth that serves cafeterias and businesses across North America. But shares are off 6% so far in 2011, and investors haven’t had the stomach for SYY lately. Sysco stock is off almost 15% since mid-May.

Time Warner is a media and entertainment company with its fingers in a lot of pies, from Warner Bros. movies to the TNT television network to providing telecom services to homes and businesses. Shares have plummeted 16% in about 30 days.

Thomson Reuters (NYSE:TRI) is one of the biggest names in news for businesses and professionals. It is not, however, a big name with investors right now. The stock is off over 18% so far in 2011.

Walt Disney is an entertainment behemoth that needs no introduction. However, its resorts, films and television offerings on ABC and ESPN networks haven’t had enough popularity to boost DIS stock lately. Disney is off 12% year-to date and more than 20% in the past 90 days.

Get more analysis of these stock grades with my free Portfolio Grader tool.