Cross section measurements of the reactions 90,92Zr(p,γ) 91,93Nb were performed using the National Superconducting Cyclotron Laboratory Summing NaI(Tl) detector at the University of Notre Dame. These reactions are part of the nuclear reaction flow for the synthesis of the light p nuclei. For the 90Zr(p,γ)91Nb reaction the new measurement resolves the disagreement between previous results. For the 92Zr(p,γ)93Nb reaction the present work reports the first measurement of this reaction cross section. Both reaction cross sections are compared to theoretical calculations and a very good agreement with the standard NON-SMOKER model is observed.