Browse Items (13651 total)

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

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.

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

Blister rust in large white pine. Tree seed plant Angus

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.

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.

Mistletoe (Arceuthobium spp.) UBC Forest, Haney.

White spruce (control) one season after treatment of Nitrogen as ammonium sulphate at 300lbs/ac. Larose Forest, near Ottawa. The person is Leo Mullen.

White spruce fertilized with 300 lbs/ac of ammonium sulfate in May 1955, Photo, August 1956. N.B. plentiful green foliage. cf.#86 Person is Leo Mullen.