The pine clones, which were selected for their
resistance to Pine Pitch Canker, and the cypress seedlings, could grow
to a height of 100 feet. Pine Pitch Canker is a fungal disease that
killed about 80% of the Monterey pines around the town of Santa Cruz
alone, and tends to disfigure some of the Presidio pines. The disease
ultimately leads the death of the trees.
There are some 70,000 trees in the forests of the
Presidio and about 17% of them are Monterey pines. The Presidio Trust
is obligated to replace the aging forest, which was planted by the U.S.
Army at the same time some 120 years ago or so. Chief forester Peter
Ehrlich says it was necessary to find Pine Pitch Canker resistant trees
in the Presidio’s forest.
“We had some clones of the trees that showed
resistance rooted in Monterey last year, Ehrlich says. “These are
cuttings taken from trees that showed tolerance or resistance to the
disease in a University of California Davis study.’’
The Presidio forests are considered even-aged,
because they were generally planted at the same time. The Presidio
forestry program currently reforests from 2 to 2.5 acres of forest a
year, so that an uneven aged forest can begin to form. This year it will
be 2.1 acres.
The Kobbe planting is part of the Kobbe Key
Historic Stand. There are four Key Historic Stands in the Presidio: the
Kobbe, Arguello, Presidio Gate and Park Boulevard.
These stands are not only contributing factors to
the Presidio's Historic Landmark Status, but they (the Key Historic
Stands) are called "Character Defining" in that they embody the visual
qualities that most people associate with the forest here.
Presidio Trust Media RelationsDana PolkT: (415) 561-2710E: email@example.com