University of California Citrus Experiment Station
Encyclopedia
The University of California Citrus Experiment Station is the founding unit of the University of California, Riverside
University of California, Riverside
The University of California, Riverside, commonly known as UCR or UC Riverside, is a public research university and one of the ten general campuses of the University of California system. UCR is consistently ranked as one of the most ethnically and economically diverse universities in the United...

 campus in Riverside, California
Riverside, California
Riverside is a city in Riverside County, California, United States, and the county seat of the eponymous county. Named for its location beside the Santa Ana River, it is the largest city in the Riverside-San Bernardino-Ontario metropolitan area of Southern California, 4th largest inland California...

, United States. The station contributed greatly to the cultivation of the orange
Citrus production
Citrus fruits are the highest value fruit crop in terms of international trade. There are two main markets for citrus fruit:* the fresh fruit market* the processed citrus fruits market...

 and the overall agriculture industry
Agribusiness
In agriculture, agribusiness is a generic term for the various businesses involved in food production, including farming and contract farming, seed supply, agrichemicals, farm machinery, wholesale and distribution, processing, marketing, and retail sales....

 in California
California
California is a state located on the West Coast of the United States. It is by far the most populous U.S. state, and the third-largest by land area...

. Established February 14, 1907, the station celebrated its 100th anniversary in 2007.

The Rubidoux Laboratory

The Southern California
Southern California
Southern California is a megaregion, or megapolitan area, in the southern area of the U.S. state of California. Large urban areas include Greater Los Angeles and Greater San Diego. The urban area stretches along the coast from Ventura through the Southland and Inland Empire to San Diego...

 "citrus belt" developed rapidly in the 1870s after experimental navel orange
Orange (fruit)
An orange—specifically, the sweet orange—is the citrus Citrus × sinensis and its fruit. It is the most commonly grown tree fruit in the world....

 plantings were conducted in Riverside
Riverside, California
Riverside is a city in Riverside County, California, United States, and the county seat of the eponymous county. Named for its location beside the Santa Ana River, it is the largest city in the Riverside-San Bernardino-Ontario metropolitan area of Southern California, 4th largest inland California...

, using cuttings introduced from Bahia
Bahia
Bahia is one of the 26 states of Brazil, and is located in the northeastern part of the country on the Atlantic coast. It is the fourth most populous Brazilian state after São Paulo, Minas Gerais and Rio de Janeiro, and the fifth-largest in size...

, Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

. Within two decades commercial orange groves stretched eastward from Pasadena to Redlands beneath the foothills of the San Gabriel
San Gabriel Mountains
The San Gabriel Mountains Range is located in northern Los Angeles County and western San Bernardino County, California, United States. The mountain range lies between the Los Angeles Basin and the Mojave Desert, with Interstate 5 to the west and Interstate 15 to the east...

 and San Bernardino
San Bernardino Mountains
The San Bernardino Mountains are a short transverse mountain range north and east of San Bernardino in Southern California in the United States. The mountains run for approximately 60 miles east-west on the southern edge of the Mojave Desert in southwestern San Bernardino County, north of the...

 mountains. A citrus grower named John Henry Reed is credited with first proposing a state-funded scientific experiment station specifically for citrus research in Southern California, and organized a vigorous lobbying effort of the local citrus industry towards that end. As founding member and chair of the Riverside Horticultural Club's experimental committee, he also pioneered a collaborative approach to conducting experimental plantings, and published more than 150 semitechnical and popular papers on citrus and other subjects between 1895 and 1915.

Riverside California State Assembly
California State Assembly
The California State Assembly is the lower house of the California State Legislature. There are 80 members in the Assembly, representing an approximately equal number of constituents, with each district having a population of at least 420,000...

 member Miguel Estudillo worked with Reed and a committee of the Riverside Chamber of Commerce to draft Assembly Bill 552, which provided for a pathological laboratory and branch experiment station in Southern California. On March 18, 1905, a legislative board of commissioners was appropriated $30,000 to select the site and implement the measure. On February 14, 1907, the University of California Regents
Regents of the University of California
The Regents of the University of California make up the governing board of the University of California. The Board has 26 full members:* The majority are appointed by the Governor of California for 12-year terms....

 established the UC Citrus Experiment Station (CES) on 23 acres (93,077.8 m²) of land on the east slope of Mount Rubidoux in Riverside. However, the University's decision to concentrate on the development of the University Farm in Davis lead to only one scientist among two initial staff being assigned to the CES. Dubbed the Rubidoux Laboratory, the initial purpose of the station was to concentrate on various soil management
Soil management
Soil management concerns all operations, practices and treatments used to protect soil and enhance its performance.-Practices:Soil management practices that affect soil quality:...

 problems such as fertilization, irrigation
Irrigation
Irrigation may be defined as the science of artificial application of water to the land or soil. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and revegetation of disturbed soils in dry areas and during periods of inadequate rainfall...

, and improvement of crops
Crop (agriculture)
A crop is a non-animal species or variety that is grown to be harvested as food, livestock fodder, fuel or for any other economic purpose. Major world crops include maize , wheat, rice, soybeans, hay, potatoes and cotton. While the term "crop" most commonly refers to plants, it can also include...

.

Expansion and Relocation to Box Springs

In 1913, a record killing freeze caused a panic throughout the $175 million Southern California citrus industry, which demanded more state-funded agricultural research. Three acts of the California Legislature in 1913 provided $185,000 to fund an enlarged Citrus Experiment Station to be located in one of the eight southern counties. Developers of the San Fernando Valley
San Fernando Valley
The San Fernando Valley is an urbanized valley located in the Los Angeles metropolitan area of southern California, United States, defined by the dramatic mountains of the Transverse Ranges circling it...

, recently opened for settlement by the 1914 completion of the Owens Valley aqueduct, lobbied intensively for the CES to be relocated there. Herbert John Webber, professor of plant breeding
Plant breeding
Plant breeding is the art and science of changing the genetics of plants in order to produce desired characteristics. Plant breeding can be accomplished through many different techniques ranging from simply selecting plants with desirable characteristics for propagation, to more complex molecular...

 and the newly appointed CES director from Cornell University
Cornell University
Cornell University is an Ivy League university located in Ithaca, New York, United States. It is a private land-grant university, receiving annual funding from the State of New York for certain educational missions...

, considered various site proposals but ultimately worked with Riverside officials and local growers to assist in drafting and endorsing a proposal for the station to be relocated to its current site on 475 acres (1.9 km²) of land 2.5 miles (4 km) from downtown Riverside, adjacent to the Box Springs Mountain
Box Springs Mountain
Box Springs Mountain, at about , is the highest peak in the Box Springs Mountains range in north-west Riverside County, California, United States. The mountain is east of downtown Riverside, and north-west of Moreno Valley, a partial border between the two large cities...

s. On December 14, 1914 the UC Regents approved the selection, news of which caused jubilation in downtown Riverside: "The entire city turned into the streets, the steam whistle on the electrical plant blew for 15 minutes, and the Mission Inn bells were rung in celebration." It was, according to Reed as quoted in the Riverside Daily Press: "...the most important day that has occurred in all the history of Riverside."

The new station was to be governed autonomously under Webber's direction. He spent the next few years personally recruiting the founding research team, eleven scientists organized into six divisions of agricultural chemistry
Agricultural chemistry
Agricultural chemistry is the study of both chemistry and biochemistry which are important in agricultural production, the processing of raw products into foods and beverages, and in environmental monitoring and remediation...

, plant physiology
Plant physiology
Plant physiology is a subdiscipline of botany concerned with the functioning, or physiology, of plants. Closely related fields include plant morphology , plant ecology , phytochemistry , cell biology, and molecular biology.Fundamental processes such as photosynthesis, respiration, plant nutrition,...

, plant pathology, entomology
Entomology
Entomology is the scientific study of insects, a branch of arthropodology...

, plant breeding
Plant breeding
Plant breeding is the art and science of changing the genetics of plants in order to produce desired characteristics. Plant breeding can be accomplished through many different techniques ranging from simply selecting plants with desirable characteristics for propagation, to more complex molecular...

, and orchard management
Orchard
An orchard is an intentional planting of trees or shrubs that is maintained for food production. Orchards comprise fruit or nut-producing trees which are grown for commercial production. Orchards are also sometimes a feature of large gardens, where they serve an aesthetic as well as a productive...

. Webber also initiated the development of the Citrus Variety Collection on 5 acres (20,234.3 m²) planted with approximately 500 species
Species
In biology, a species is one of the basic units of biological classification and a taxonomic rank. A species is often defined as a group of organisms capable of interbreeding and producing fertile offspring. While in many cases this definition is adequate, more precise or differing measures are...

 of citrus from around the world, which grew to become the greatest such variety collection internationally. He also planted hundreds of other subtropical crops, including 70 varieties of avocado
Avocado
The avocado is a tree native to Central Mexico, classified in the flowering plant family Lauraceae along with cinnamon, camphor and bay laurel...

, imported from Mexico
Mexico
The United Mexican States , commonly known as Mexico , is a federal constitutional republic in North America. It is bordered on the north by the United States; on the south and west by the Pacific Ocean; on the southeast by Guatemala, Belize, and the Caribbean Sea; and on the east by the Gulf of...

, that produced more than 45,000 hybrids through controlled pollination
Pollination
Pollination is the process by which pollen is transferred in plants, thereby enabling fertilisation and sexual reproduction. Pollen grains transport the male gametes to where the female gamete are contained within the carpel; in gymnosperms the pollen is directly applied to the ovule itself...

. (He also engaged in agricultural extension
Agricultural extension
Agricultural extension was once known as the application of scientific research and new knowledge to agricultural practices through farmer education...

 activities by founding the California Avocado Association in 1914, and by organizing the annual citrus institute of the National Orange Show in San Bernardino and the Date Growers Institute of Coachella Valley
Coachella Valley
Coachella Valley is a large valley landform in Southern California. The valley extends for approximately 45 miles in Riverside County southeast from the San Bernardino Mountains to the saltwater Salton Sea, the largest lake in California...

.)

The original laboratory, farm, and residence buildings on the Box Springs site were designed by Lester H. Hibbard of Los Angeles, a graduate of the University of California School of Architecture, in association with a colleague, H.B. Cody. Built at a cost of $165,000, the architecture followed the Mission style
Mission style
Mission style may refer to the following:*Mission Style Furniture*Mission Revival Style architecture*American Craftsman, an architectural and design movement*Mission School, an art movement of the late 20th century...

 suggesting the Spanish colonial heritage of Southern California. The site, which became the early nucleus of the UCR campus, eventually opened in 1917, although the Division of Agricultural Chemistry continued to occupy lab space at the Rubidoux site. (The Rubidoux site is today occupied by the UC Center for Water Resources.)

Research achievements during the Webber Administration

Webber's tenure as director of the CES lasted, with a few interruptions, from 1913 until his retirement in 1929. A few important achievements of the CES during his directorship were: Walter P. Kelly's development of drainage
Drainage
Drainage is the natural or artificial removal of surface and sub-surface water from an area. Many agricultural soils need drainage to improve production or to manage water supplies.-Early history:...

 techniques for reclaiming thousands of acres of California land made unproductive by salt accumulation
Soil salination
Soil salinity is the salt content in the soil.- Causes of soil salinity :Salt-affected soils are caused by excess accumulation of salts, typically most pronounced at the soil surface. Salts can be transported to the soil surface by capillary transport from a salt laden water table and then...

; the development of chemical fertilizers; the discovery of boron
Boron
Boron is the chemical element with atomic number 5 and the chemical symbol B. Boron is a metalloid. Because boron is not produced by stellar nucleosynthesis, it is a low-abundance element in both the solar system and the Earth's crust. However, boron is concentrated on Earth by the...

 poisoning, methods for its control, and an understanding of the necessity of minute amounts of boron in citrus growth. Howard B. Frost's pioneering genetic
Genetics
Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

 research lead to the first accurate reports of the normal number of chromosome
Chromosome
A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA-bound proteins, which serve to package the DNA and control its functions.Chromosomes...

s for some citrus, the first discovery of polyploidy
Polyploidy
Polyploid is a term used to describe cells and organisms containing more than two paired sets of chromosomes. Most eukaryotic species are diploid, meaning they have two sets of chromosomes — one set inherited from each parent. However polyploidy is found in some organisms and is especially common...

 in citrus, and the first descriptions of citrus tetraploids. Frost also developed tools for guiding artificial hybridization for production of new citrus cultivar
Cultivar
A cultivar'Cultivar has two meanings as explained under Formal definition. When used in reference to a taxon, the word does not apply to an individual plant but to all those plants sharing the unique characteristics that define the cultivar. is a plant or group of plants selected for desirable...

s, which resulted in widespread propagation of nuclear lines
Nuclear DNA
Nuclear DNA, nuclear deoxyribonucleic acid , is DNA contained within a nucleus of eukaryotic organisms. In mammals and vertebrates, nuclear DNA encodes more of the genome than the mitochondrial DNA and is composed of information inherited from two parents, one male, and one female, rather than...

 and contributed to the improvement of citrus plantings throughout the world. By working out the etiology
Etiology
Etiology is the study of causation, or origination. The word is derived from the Greek , aitiologia, "giving a reason for" ....

 of various types of diseases, particularly gummosis
Gummosis
Gummosis is the formation of patches of a gummy substance on the surface of certain plants, particularly fruit trees. This occurs when sap oozes from wounds or cankers as a reaction to outside stimuli such as adverse weather conditions, infections, insect problems, or mechanical damage. It is...

, Howard S. Faucet contributed significantly to improved methods for disease control and made possible the discovery of the viral
Virus
A virus is a small infectious agent that can replicate only inside the living cells of organisms. Viruses infect all types of organisms, from animals and plants to bacteria and archaea...

 nature of some diseases which were responsible for causing quick decline among 3 million orange trees over a 25 year period. H.J. Quale's entomological
Entomology
Entomology is the scientific study of insects, a branch of arthropodology...

 research on citrus insects, mite
Mite
Mites, along with ticks, are small arthropods belonging to the subclass Acari and the class Arachnida. The scientific discipline devoted to the study of ticks and mites is called acarology.-Diversity and systematics:...

s, and walnut insects lead to the first recognition of the problem of insect resistance to fumigation
Fumigation
Fumigation is a method of pest control that completely fills an area with gaseous pesticides—or fumigants—to suffocate or poison the pests within. It is utilized for control of pests in buildings , soil, grain, and produce, and is also used during processing of goods to be imported or...

, and of means of overcoming it. Harry H. Smith and Harold Compere's discovery of natural parasites of the citrophilus mealybug in Australia
Australia
Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 effected almost complete control of this parasite in California, which saved growers in Orange County
Orange County, California
Orange County is a county in the U.S. state of California. Its county seat is Santa Ana. As of the 2010 census, its population was 3,010,232, up from 2,846,293 at the 2000 census, making it the third most populous county in California, behind Los Angeles County and San Diego County...

 almost $1 million in crop losses annually. Although its major emphasis was on citrus, the CES also made research contributions to every major crop grown in Southern California.

The Citrus Research Center and Agricultural Experiment Station

After Webber retired, Leon D. Batchelor became the second director of the CES. Under his direction, the land, capital facilities, and operating budget expanded significantly, and the station moved into several new areas of agricultural science
Agricultural science
Agricultural science is a broad multidisciplinary field that encompasses the parts of exact, natural, economic and social sciences that are used in the practice and understanding of agriculture. -Agriculture and agricultural science:The two terms are often confused...

, including statistics
Statistics
Statistics is the study of the collection, organization, analysis, and interpretation of data. It deals with all aspects of this, including the planning of data collection in terms of the design of surveys and experiments....

 and experimental plot design, herbicide
Herbicide
Herbicides, also commonly known as weedkillers, are pesticides used to kill unwanted plants. Selective herbicides kill specific targets while leaving the desired crop relatively unharmed. Some of these act by interfering with the growth of the weed and are often synthetic "imitations" of plant...

s to reduce weeds, and the first studies of the effects of air pollution
Air pollution
Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere....

 on crops. After he retired in 1951, Alfred M. Boyce became the new director, and the CES entered another period of growth as agricultural production in Southern California boomed after World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

. The old divisional structure was replaced along departmental lines, and five new departments were added, including the nation's first department of nematology
Nematology
Nematology is the scientific discipline concerned with the study of nematodes, or roundworms. Although nematological investigation dates back to the days of Aristotle or even earlier, nematology as an independent discipline has its recognizable beginnings in the mid to late 19th century.- History...

. A committee on air pollution research was also developed in 1953.

When the Citrus Experiment Station celebrated its fiftieth anniversary, it had grown considerably in size and stature with several new buildings and a wider range of horticultural research conducted with more acres for experimental plantings. The laboratory's original two staff personnel increased to 265 personnel by 1957. The lab itself had become famous throughout the citrus industry. In 1961, to reflect the growth of the laboratory, the name was changed to the Citrus Research Center and Agricultural Experiment Station (CES-AES). At the time, the director was Alfred M. Boyce for which Boyce Hall, the home to the Entomology and Biochemistry Departments, is named.

Successive development

In the 1970s, research at the station incorporated new scientific disciplines and techniques such as molecular biology
Molecular biology
Molecular biology is the branch of biology that deals with the molecular basis of biological activity. This field overlaps with other areas of biology and chemistry, particularly genetics and biochemistry...

 and genetics
Genetics
Genetics , a discipline of biology, is the science of genes, heredity, and variation in living organisms....

. Environmental protection
Environmental protection
Environmental protection is a practice of protecting the environment, on individual, organizational or governmental level, for the benefit of the natural environment and humans. Due to the pressures of population and our technology the biophysical environment is being degraded, sometimes permanently...

 along with agriculture in arid
Arid
A region is said to be arid when it is characterized by a severe lack of available water, to the extent of hindering or even preventing the growth and development of plant and animal life...

 and semiarid regions became new focus areas. New crops were developed, including turfgrass varieties with tolerance to soil salinity and air pollution
Air pollution
Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere....

. Biological control and integrated pest management
Integrated Pest Management
Integrated pest management is an ecological approach to agricultural pest control that integrates pesticides/herbicides into a management system incorporating a range of practices for economic control of a pest...

 remained robust areas of research. In one case, the importation and establishment of a tiny stingless wasp brought the ash whitefly, which caused millions of dollars in damage to agriculture and also despoiled cars, under control. It was a case that brought wide spread attention to Citrus Experiment Station research.

The last quarter-century has also seen the release of several patented new varieties of citrus, starting with the ‘Oroblanco
Oroblanco
An oroblanco or sweetie is a cross between an acidless pomelo and a white grapefruit. It is slightly larger in size than a grapefruit but has fewer seeds and is sweeter. When ripe, its thick rind is bright green or golden in color. The Oroblanco fruit has a similar taste to the scent of its flowers...

grapefruit
Grapefruit
The grapefruit , is a subtropical citrus tree known for its sour fruit, an 18th-century hybrid first bred in Barbados. When found, it was named the "forbidden fruit"; it has also been misidentified with the pomelo or shaddock , one of the parents of this hybrid, the other being sweet orange The...

 in 1981 and continuing with the recent release of the ‘Tango’ mandarin
Mandarin orange
The orange, also known as the ' or mandarine , is a small citrus tree with fruit resembling other oranges. Mandarin oranges are usually eaten plain or in fruit salads...

. Another breeding program has yielded cowpea
Cowpea
The Cowpea is one of several species of the widely cultivated genus Vigna. Four cultivated subspecies are recognised:*Vigna unguiculata subsp. cylindrica Catjang...

 lines that are early-maturing and heat-tolerant, making them particularly well-suited to the drought conditions of West Africa
West Africa
West Africa or Western Africa is the westernmost region of the African continent. Geopolitically, the UN definition of Western Africa includes the following 16 countries and an area of approximately 5 million square km:-Flags of West Africa:...

, helping to reduce hunger
Hunger
Hunger is the most commonly used term to describe the social condition of people who frequently experience the physical sensation of desiring food.-Malnutrition, famine, starvation:...

 and poverty
Poverty
Poverty is the lack of a certain amount of material possessions or money. Absolute poverty or destitution is inability to afford basic human needs, which commonly includes clean and fresh water, nutrition, health care, education, clothing and shelter. About 1.7 billion people are estimated to live...

 there.

Today, the CES-AES is operated by Agricultural Operations, a support department of the College of Natural and Agricultural Sciences at UCR. In addition to the original 420 acres (1.7 km²) CES-AES, the department also oversees the 540 acres (2.2 km²) Coachella Valley Agricultural Research Station, located about 80 miles (128.7 km) southeast of campus, in a desert environment near the Salton Sea
Salton Sea
The Salton Sea is a shallow, saline, endorheic rift lake located directly on the San Andreas Fault, predominantly in California's Imperial Valley. The lake occupies the lowest elevations of the Salton Sink in the Colorado Desert of Imperial and Riverside counties in Southern California. Like Death...

. (Acquired in 1991 to mitigate the loss of agricultural lands on the UCR main campus due to development.) On the two stations, over 50 crops are grown for research including citrus
Citrus
Citrus is a common term and genus of flowering plants in the rue family, Rutaceae. Citrus is believed to have originated in the part of Southeast Asia bordered by Northeastern India, Myanmar and the Yunnan province of China...

, avocado
Avocado
The avocado is a tree native to Central Mexico, classified in the flowering plant family Lauraceae along with cinnamon, camphor and bay laurel...

, turfgrass, asparagus
Asparagus
Asparagus officinalis is a spring vegetable, a flowering perennialplant species in the genus Asparagus. It was once classified in the lily family, like its Allium cousins, onions and garlic, but the Liliaceae have been split and the onion-like plants are now in the family Amaryllidaceae and...

, date palm
Date Palm
The date palm is a palm in the genus Phoenix, cultivated for its edible sweet fruit. Although its place of origin is unknown because of long cultivation, it probably originated from lands around the Persian Gulf. It is a medium-sized plant, 15–25 m tall, growing singly or forming a clump with...

s, vegetable
Vegetable
The noun vegetable usually means an edible plant or part of a plant other than a sweet fruit or seed. This typically means the leaf, stem, or root of a plant....

s, small grain
GRAIN
GRAIN is a small international non-profit organisation that works to support small farmers and social movements in their struggles for community-controlled and biodiversity-based food systems. Our support takes the form of independent research and analysis, networking at local, regional and...

, alfalfa
Alfalfa
Alfalfa is a flowering plant in the pea family Fabaceae cultivated as an important forage crop in the US, Canada, Argentina, France, Australia, the Middle East, South Africa, and many other countries. It is known as lucerne in the UK, France, Australia, South Africa and New Zealand, and known as...

, and ornamentals
Ornamental plant
Ornamental plants are plants that are grown for decorative purposes in gardens and landscape design projects, as house plants, for cut flowers and specimen display...

.

Library collections

The University of California, Riverside Libraries are now home to the research collections of the former Citrus Experiment Station Library as well as substantial archives containing historical and administrative documents from the Station. A sampling of historical materials and rare books from Special Collections are represented in the online Citrus Experiment Station Centennial Exhibition on the UCR Libraries website. Visit exhibition
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