| tropospheric ozone reduces carbon assimilation in trees: estimates from analysis of continuous flux measurements. | high ground-level ozone concentrations are typical of mediterranean climates. plant exposure to this oxidant is known to reduce carbon assimilation. ozone damage has been traditionally measured through manipulative experiments that do not consider long-term exposure and propagate large uncertainty by up-scaling leaf-level observations to ecosystem-level interpretations. we analyzed long-term continuous measurements (>9 site-years at 30 min resolution) of environmental and eco-physiological param ... | 2013 | 23589473 |
| oranges or "lemons"? family farming and product quality in the spanish orange industry, 1870-1960. | in the early twentieth century california became a big exporter of some agricultural products that, until then, had only been grown on a large scale in the mediterranean basin. as a result, exports of those products diminished or stagnated in mediterranean countries, with important repercussions on their economies. the spanish orange industry, however, continued to expand, despite the fact that a substantial percentage of spanish oranges came from farms owned by (often illiterate) small peasants ... | 2010 | 20509234 |
| pesticide applications of copper on perennial crops in california, 1993 to 1998. | inorganic copper is used as a broad-spectrum fungicide and bacteriocide on a variety of agricultural crops. after application, the copper residue typically accumulates in the upper 15 cm of soil. data from the california pesticide use reports were used to estimate the augmentation of copper in the soil that resulted from pesticide applications for the six years from 1993 to 1998 on 12 crops that are grown without rotation. the estimated mean mg cu kg(-1) soil added to the upper 15 cm during the ... | 2001 | 11577894 |
| identification and characterization of citrus tristeza virus isolates breaking resistance in trifoliate orange in california. | most citrus tristeza virus (ctv) isolates in california are biologically mild and symptomless in commercial cultivars on ctv tolerant rootstocks. however, to better define california ctv isolates showing divergent serological and genetic profiles, selected isolates were subjected to deep sequencing of small rnas. full-length sequences were assembled, annotated and trifoliate orange resistance-breaking (rb) isolates of ctv were identified. phylogenetic relationships based on their full genomes pl ... | 2017 | 28453412 |
| nutrients in fresh peeled oranges and grapefruit from california and arizona. | naval oranges, valencia oranges, and grapefruit, representative of the california and arizona citrus crop, were collected over three consecutive growing seasons, and the nutritional composition of their juices was determined. measured as per cent of the u.s. rdas, folic acid, magnesium, vitamin a (oranges only), vitamin b6, thiamin, and ascorbic acid are all supplied in greater proportion than the calories present, while niacin and calcium are supplied in approximately proportionate amounts. | 1980 | 7430512 |
| phylogeographic structure, outbreeding depression, and reluctant virgin oviposition in the bean thrips, caliothrips fasciatus (pergande) (thysanoptera: thripidae), in california. | bean thrips, caliothrips fasciatus, is native to western north america. once considered a pest of several crops in its native area, its pest status has waned over recent decades. however, due to its habit of aggregating in the navel of navel oranges, bean thrips remains economically important because some countries importing oranges from california have designated it a quarantine pest. despite continued propagule pressure, bean thrips has never established outside north america. we examined gene ... | 2012 | 22676974 |