B737 FLT CREW FAILS TO PROPERLY EXECUTE A GAR AFTER NOT ACQUIRING PSP ARPT ON A VISUAL APCH DUE TO DUST.

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WE WERE BEING VECTORED ON A L DOWNWIND FOR A VISUAL APCH TO RWY 13R AT PSP. PSP RPTED WX 5 MI VISIBILITY BLOWING DUST; SURFACE WINDS VARIABLE WITH GUSTS UP TO 20 KTS; RPT MODERATE TURB. AS WE WERE VECTORED TOWARD THE ARPT FOR A VISUAL APCH WE DID NOT GET THE ARPT IN SIGHT DUE TO BLOWING DUST. APCH TOLD US TO CLB FROM 4000 FT TO 5000 FT MSL AND EXPECT VECTORS FOR A VOR APCH. THE FO WAS THE PF. I STARTED TO PROGRAM THE FMC FOR AN APCH WHEN ATC CALLED AND SAID THAT WE NEEDED TO EXPEDITE CLB DUE TO TERRAIN AHEAD. THE FO NEEDED PROMPTING TO START CLB AND RETRACT THE GEAR AND FLAPS. AFTER GETTING THE GEAR UP AND FLAPS TO 1 DEG I WENT BACK TO SELECTING THE APCH IN THE FMC. WHEN I LOOKED UP AT THE FLT INSTS THE ACFT AIRSPD WAS BELOW MANEUVERING AIRSPD FOR OUR FLAP CONFIGN AND WE WERE NOT ACCELERATING. I TOOK COMMAND OF THE FLYING DUTIES AND REGAINED AIRSPD. DURING THIS TIME WE WERE EXPERIENCING MODERATE TURB AND WIND GUSTS +30 KTS. WE GOT CLRNC TO PROCEED TO OGIBE AND COMPLETED THE RNAV RWY 13R APCH; TO AN UNEVENTFUL LNDG RWY 13R IN VISUAL CONDITIONS. MY BRIEFING FOR THIS APCH WAS VERY ABBREVIATED; AS I DID NOT DESIRE TO DELAY THE APCH DUE TO MODERATE TURB WE WERE ENCOUNTERING. LOOKING BACK IT WOULD HAVE BEEN MUCH BETTER TO HAVE EXECUTED THE RNAV INST APCH FROM THE BEGINNING. THE FO'S GETTING SLOW DURING THE CLB WAS PARTIALLY DUE TO DOING A CLEAN-UP OF THE ACFT FROM THIS SITUATION AND NOT SOMETHING WE SPECIFICALLY TRAIN FOR AND ALSO HE IS FAIRLY NEW ON THE ACFT.