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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 ...
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 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.
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.
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 ...
This study had begun in October 1960 with Ohio acorns, and unfolded two years later in 1962 to include more oak trees in the U.S. [3] When looking particularly at the life history of C. posticatus, it was revealed that the larvae of the C. posticatus species had gone through 5 instars, where they emerged in 14 days from bur oak acorns and 30 ...
California physician and botanist (and one of the founding fathers of the California Academy of Sciences) Albert Kellogg described an oak in an 1855 publication as Quercus arcoglandis (spur acorn oak), [10] apparently the same species as Q. wislizeni. This clearly predates French-Swiss botanist de Candolle's 1864 name, and if confirmed to be ...
Galls (upper left and right) formed on acorns on the branch of a pedunculate (or English) oak tree by the parthenogenetic generation Andricus quercuscalicis.. The large 2 cm gall growth appears as a mass of green to yellowish-green, ridged, and at first sticky plant tissue on the bud of the oak, that breaks out as the gall between the cup and the acorn.