In Casuarina species, character association and path coefficient analysis were worked out for 11 variables using five species in Northern dry zone of Karnataka. Genotypic correlations were higher than phenotypic correlations for all the variables. Highly significant positive correlation of biomass with tree height, clear bole height, diameter, number of branches, crown spread, volume of wood and volume index observed at both genotypic and phenotypic level. Path coefficient analysis of different traits contributing towards production of biomass yield per tree revealed that volume of wood had exercised highest direct positive effect. In similar trend direct positive effect from number of branches followed by clear bole height and diameter for biomass production was at low magnitude. However, volume index exerted negative direct effect on biomass yield per tree followed by bark thickness, needle length and crown spreading. Maximum positive indirect effect on biomass was exerted by clear bole height through volume of wood.