Bulletin - California. Dept. of Agriculture Volume 6 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ... blister rust there will be no timber in the future large enough to be utilized. If the present fight against the fungus is not successful, the first economic effect will be felt within twenty to thirty years. The situation is Fio. 81.--Life cycle of Cronartium ribicola. No. 1. Pycnospore. No..1. Aeciospore. No. 3. Uredinlospore. No. 4. Teliospore. No. 5. Sporidinm. (U. S. Department of Agriculture.) alarming now; it will be critical or hopeless then, as it is in Europe, with Ihis difference that the values at stake in this country are immeasurably greater than those abroad. The white pine forests of the East are not the only assets in danger from the blister rust. The monetary values stored in sugar pine and western white pine in the West amount to hundreds of millions of dollars, while the role both trees play in the beauty and grandeur of the forests of the West can not be expressed in dollars and cents. So far the disease is unknown in the home of either sugar pine or western white pine; but both trees in cultivation abroad have contracted the disease exactly as white pine had done before, and just as the blister rust was brought into America in shipments of young living white pines, the disease may at any time be introduced into the western forests on nursery stock coming from an infected terri Fig. 82.--Chestnut bark disease. The main stem of the chestnut plant has been artificially inoculated with Endothia parasitica. The result of the infection Is shown in the drooping and shriveling of the foliage. (U. S. Department of Agriculture, Yearbook 1912, PI. 37.) tory. In this way a single diseased white pine introduced into a nursery, cemetery, private garden or park of the West may become the starting point for an epidemic of disastrous consequences. A s...