Transgenic Bt corn (Zea mays L.) containing the MON 863 Bt event and commercially marketed as YieldGard ® Rootworm (YGRW) was introduced to Pennsylvania corn producers in 2003. While the product has potential to reduce insecticide inputs for western corn rootworm [Diabrotica virgifera virgifera (LeConte)] in many corn fields following corn, its performance has not been well documented in the region. The objective of this research was to assess the performance of a YGRW corn hybrid compared to an untreated check, a row insecticide (Force 3G (tefluthrin)), and a rootworm seed applied insecticide (Poncho 1250 (clothianidin)). A replicated strip testing program was conducted at a total of twelve locations in 2003 and 2004 in fields that were cropped to corn in the previous year. At all locations, treatments included a YGRW hybrid, its untreated non-transgenic isoline, and the isoline treated with Force 3G at 5 oz/1000 ft row. At three locations in 2004, the isoline seed treated with Poncho 1250 was included. Treatments were planted in field length strip plots, four to six rows wide and replicated at least three times at each location. Fifteen roots from each plot were evaluated for corn rootworm damage using the Iowa State 0-3 scale. Plant populations, grain moisture and grain yield were also measured from each plot. The YGRW treatment resulted in similar root ratings as the Force treatment except at one location, where the Force had significantly higher root ratings. The Poncho 1250 had similar ratings to the YGRW where they were compared. Averaged over all locations, YGRW, Force and the untreated check corn grain yields were 157, 152 and 143 bu/ac, respectively. YGRW hybrids appear to provide similar or superior corn rootworm protection and grain yields as their isolines treated with alternative insecticide treatments.