Jackson put on disabled list

The Dodgers put rookie starter Edwin Jackson on the 15-day disabled list because of a strained right forearm. The move opened a spot on the 25-man roster for the club to activate starter Odalis Perez from the disabled list. Dodger trainers feel Jackson's lack of pain -- and a negative MRI -- is an indication that the strain is not severe. The injury is apparently to the muscle that controls the middle finger.

Jackson left a start July 3 at Anaheim with a strange feeling in his elbow, but an MRI taken a few days later showed no structural damage. Jackson made his next scheduled start, July 8 against Houston, but felt numbness in his middle finger during a routine side session Friday at Bank One Ballpark.

An MRI showed some swelling around the muscle that controls the middle finger. He feels it when he applies pressure to his middle finger that he uses to finish his fastball.

Jackson is taking anti-inflammatories to reduce the swelling. He also is working with physical therapist Pat Screnar.

Wilson Alvarez is scheduled to take Jackson's turn in the rotation against Houston. Alvarez has made seven starts and 16 relief appearances. Overall, he's 4-3 with a 3.51 ERA.