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MARIN COUNTY, Calif. - The rainy season brings life-giving water to California but often enacts a penalty in the form of floods, mudslides and falling trees. Now, a new danger has come to light ...
Oaks produce more acorns when they are not too close to other oaks and thus competing with them for sunlight, water and soil nutrients. The fires tended to eliminate the more vulnerable young oaks and leave old oaks which created open oak savannas with trees ideally spaced to maximize acorn production.
Quercus douglasii, known as blue oak, is a species of oak endemic to California, common in the Coast Ranges and the foothills of the Sierra Nevada. [4] It is California's most drought-tolerant deciduous oak, [5] and is a dominant species in the blue oak woodland ecosystem. It is occasionally known as mountain oak and iron oak. [6] [7]
In California, goldspotted oak borer (Agrilus auroguttatus) has destroyed many oak trees, [60] while sudden oak death, caused by the oomycete pathogen Phytophthora ramorum, has devastated oaks in California and Oregon, and is present in Europe. [61] Japanese oak wilt, caused by the fungus Raffaelea quercivora, has rapidly killed trees across ...
Acorns per pound range from 200 to 750. Acorns mature from August to November of the second year. Trees begin bearing acorns when they are about 25 years old, and optimum production is reached when they are between 50 and 75 years of age. Good acorn crops are frequent, occurring at 1- or 2-year intervals, with light crops in intervening years.
Deer begin laying down their travel routes to and from the apple and oak trees, long before the fruit and nuts even ripen. On these good years, some trees produce heavy, branch-bending loads ...
The "Henley Oak", in Covelo, California, is the tallest known valley oak, at 47 m (153 ft). [7] [8] The branches have an irregular, spreading and arching appearance. During autumn, the leaves turn a yellow to light orange color but become brown later in the season. In advancing age, the branches droop. The trees have pewter-colored rippled bark ...
The resulting larvae feed on the kernel and when fully developed, tunnel out of the nut, fall to the ground and dig themselves a small chamber. They may wait one or two years before pupating . [ 4 ] Garry oak acorns were collected in 1996, 1997 (low crop years) and in 1998 (high crop year) to examine infestation damage.