HARRISBURG — A district aide to state Rep. Bill DeWeese pleaded guilty today in a public corruption investigation and agreed to testify against her boss, five days before opening statements were scheduled in their criminal trial.

Sharon Rodavich, 56, pleaded guilty to one count each of conspiracy and conflict of interest, while four counts of theft were being dropped.

Rodavich said little during the brief proceeding but admitted to having helped DeWeese, a former Speaker of the House and Democratic leader, use public resources for campaign purposes.

She declined to comment after the hearing, as did her lawyer Tom Farrell, and state prosecutors.

The attorney general’s office has said Rodavich supervised DeWeese’s day-to-day campaign efforts in his southwestern Pennsylvania home base and rarely reported to the district office where she was assigned.

An investigative grand jury that looked into the allegations against the Democratic legislator said none of the legislative aides who testified before the panel were able to name any legislative work that Rodavich performed.

Prosecutors said Rodavich accrued hundreds of hours in sick leave, vacation time, and personal leave, and amassed 2,800 hours of compensatory time between 1999 and 2007.

DeWeese, of Greene County, has repeatedly denied the allegations against him and has vowed to put on an aggressive defense in the coming trial.