So-called "Jones disease". Actually, Sclerroderris canker, known in Europe as Brunchorstia. Typically on hard pines where the site is extreme. Kirkwood Forest. First identified by Erik Jorgensen.

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

Blister rust in large white pine. Tree seed plant Angus

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

Red pine killed by Armillaria mellea (Shoestring root rot). Trees about 10 yrs old after planting on hardwood cutover(red oak & hard maple). Nr. Dorset. The person is Erik Jorgensen.

Clearing for a secondary road in black spruce on peat. Leitch Twp. nr. Cochrane

Frost pocket in white spruce plantation, Humber Forest nr. Palgrave Pocket area was planted same as surround

Madill mobile spar in clearcutting at UBC Forest, Haney

Natural regeneration of white spruce in an old field. Chapman Valley Parry Sound. N.B. chlorosis due to nitrogen deficiency.