The management of western white pine (Pinus monticola) requires the production of a high proportion of valuable white pine crop trees in order to defray the costs of protection from blister rust. Current average selling prices of lumber give white pine about $50 per m.b.f. advantage over western larch (Larix occidentalis) and Douglas-fir (Pseudotsuga menziesii), the next most valuable species common to the type. On the average site, yielding 50 m.b.f. per acre at 120 years of age, a 10 percent difference in white pine volume would amount to $250 per acre.