Red pine grafted in Pinus sylvestris rootstock - tree surviving because branch of rootstock remains?

Red pine killed by Scleroderis lagerbergii. North Bay.

Red pine killed by Fomes annosus. Pack Forest, Warrensburg.

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.

Red pine lifted in the fall at different times and freeze-stored, then outplanted the next spring. Dead trees lifted prior to Nov. Live trees lifted later after major frost. Red pine, 3+0, storage trial.

Red pine on abandoned farmland, deep medium sand. Foliage symptoms of potassium deficiency (chlorosis>necrosis). Hughes plantation, Huntsville.

Red pine plantation 35 years old treated with K at 200lb/ac. at age 20cf. with #283 and note much less light of forest floor due to denser foliage.

Red pine plantation root deep in C horizon in old root channel cf. with root slides.

Red pine plantation used for debudding experiment, 1954. cf slides #98 & #99. Pine Springs, Frost Centre, Dorset. Persons are John Cary & Peter Hynard.

Red pine planted 1922. Adirondack Forest. Domtar Freehold.