Training camp report: Thursday, the not-so-good — four QBs, a CB and a WR

SANTA CLARA – All four of the Niners quarterbacks struggled in practice today.

Alex Smith threw three interceptions – one to Bowman, one to free safety Darcel McBath and one to reserve linebacker Mike Wilhoite. McBath’s interception came after a Mario Manningham tip in the middle of the field, but the other two picks were in the end zone. The entire offense was working on red zone efficiency, so Smith was trying to fit passes into tight windows, and today he was unsuccessful.

Colin Kaepernick threw for a touchdown and ran for one, too, but he also threw two picks – one to undrafted safety Michael Thomas and the other to outside linebacker Ahmad Brooks.

Scott Tolzien threw three picks – one to backup inside linebacker Larry Grant, another to backup safety Colin Jones and a third to undrafted rookie cornerback Deante Purvis.

Josh Johnson threw one pick at the end of practice, but got sacked many times throughout the afternoon.

Perrish Cox continues to struggle the most of the Niners top-five cornerbacks. Today he gave up touchdowns on back-to-back plays in a seven-on-seven red zone drill – one to Konrad Reuland and the other to Mario Manningham.

A.J. Jenkins was targeted three times and all three passes were intercepted.

NaVarro Bowman and Kyle Williams started practice but did not finish it. Each player came up a little gimpy during eleven-on-eleven drills, but neither guy was limping after practice.

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