Small-cap stocks took a plunge along with the broader market Wednesday. The Russell 2000 fell 1.1% to 724.24, and the S&P SmallCap 600 shed 1.2% to 382.47.Central Garden & Pet ( CENT), a Walnut Creek, Calif.-based marketer and producer of lawn and garden products as well as pet supplies, tumbled 36% to $4.44. The company said late Tuesday that high grain costs may cause fiscal 2008 profits to fall short of prior-year results. Management had said on a May 7 conference call that it expected modest year-over year improvements in financial results. Sonic Solutions ( SNIC), a developer of digital media-based computer software, traded to a new 52-week low. The Navato, Calif., company reported non-GAAP fourth-quarter earnings of $2.1 million, or 8 cents a share, vs. $968,000, or 4 cents a share, a year ago. Sonic Solutions also forecast a first-quarter loss of 9 cents a share, below the Street's view of a 1-cent per-share profit. The stock recently slipped 14% to $6.64. On the winning side, TGC Industries ( TGE), out of Plano, Texas, which provides seismic data to oil and natural gas companies, climbed $1.14, or 16%, to $8.37. The company reported that it expects its business backlog to increase substantially from the $46 million it reported at the end of the first quarter. Also rising, Youngsville, N.C.-based Xerium Technologies ( XRM), which supplies products for paper manufacturing, added 11% to $5.51. Citigroup upgraded the stock to buy from hold. Information technology service provider Stanley Inc. ( SXE) surged 10% to $33.76. The Arlington, Va., company announced Tuesday after the close that it would buy Oberon Associates for $170 million in cash.