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.

Blister rust in large white pine. Tree seed plant Angus.

Blister rust in large white pine. Tree seed plant Angus

Blister rust(Cronartium ribicola) in planted white pine. Infection was most probably in the nursery. Owen Sound MNR

Blister rust (Cronartium ribicola) aeciospores on 9 year old white pine. Leslie Frost Centre.