Blocks of age classes of maritime pine, Les Landes

Blocks of age classes of maritime pine, Les Landes

Block cut 1960 adjacent to residual block cut 1968. Photo 1976. Athabaska XIII, Northwestern Pulp & Power. Hinton

Block clearcuts in lodgepole pine. At Hinton North West Power and Pulp (now Weldwood). N.B. cutover in foreground.

Block clearcuts in 150+ lodgepole pine. 2yr old cutover in foreground. N.B. slash and fireweed.

Block clearcut (recent) N.B. small area in road. Grande Prairie, Procter & Gamble (now Weyerhaeuser)

Block clearcut (recent) N.B. small area in road. Grande Prairie, Procter & Gamble (now Weyerhaeuser)

Fruiting bodies of Cronartium ribicola (blister rust) on 8 yr white pine. N.B. aecial stage-yellow spores. Nr. Dorset.

Fruiting bodies of Cronartium ribicola (blister rust) on 8 yr white pine. N.B. aecial stage-yellow spores. Nr. Dorset

Cronartium comptoniae (Sweetfern blister rust) cankers on 50 yr jack pine. Cairo-Flavelle Twp. Engelhart Management Unit.