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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.

Mixed conifers with hardwoods treated aerially with 24D/245T. Larose Forest, near Ottawa. Treatment August 1956, photo June 1957.

Norway spruce planted in 1945 on an old field. Tall trees in the background on site of cowshed demolished 39 previously. Details in Armson K.A. Tech.Report #1, Fac. Of For. UofT, 1959.