The objective of this work was to study the genetic correlations of the popping expansion (PE), 100 kernel weight (100KW), grain production (GP) and proportion of ears attacked by pests (PEAP) and diseases (PEAD). The study was conducted at Viçosa, Brazil during the 2001-2002 growing season, using 106 S4 families of a Beija-Flor popcorn population. The experiment was designed as incomplete blocks. PE showed a positive correlation with grain production. Furthermore, a direct effect of PEAD on PE was estimated, with a correlation value of 0.56. PEAP and PEAD traits showed a high correlation (0.76), indicating that ears with high pest incidence were positively associated with grain disease damages. 100KW was not correlated with the other traits. Positively correlated responses were found between yield and popping expansion considering a simultaneous selections to both characters in previous selections cycles.