The behavior of white pine blister rust at Mountain Home State Demonstration Forest and surrounding areas in the southern Sierra Nevada of California indicates that the epidemic has not yet stabilized and that the most likely prognosis is a pandemic on white pines in this region within the next few decades. The impact on sugar pines, from young regeneration to old growth, already has been severe in some areas, and silvicultural control measures have been largely ineffective. An operational genetic program, based on selection of seed parents carrying a major resistance gene, is described that is simple and effective. This program will be useful in maintaining sugar pine as a crop species in artificial regeneration for at least one rotation, and in preserving the genetic integrity of sugar pine populations in jeopardy from the rust.

Excerpt from Annual Report on the Control of White Pine Blister Rust in California and Oregon for the Calendar Year 1951 Leadership, Coordination, and Technical Direction of Blister Rust Control by the Bureau of Entomology and. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.