Key Accomplishments

Here’s a look at some key accomplishments by CREC’s personnel over the past century, from the early 1900’s to present day, and the mark that their work has made on history - citrus and scientific.

• FCOC Invents Frozen Juice Concentrate

  Brief History of Frozen Concentrate

  FDOC researchers developed current technology for making frozen concentrate orange juice. The process was patented in 1948 by E.L. Moore, L.G. MacDowell, and C.D. Atkins of the Florida Citrus Commission, now known as the Florida Department of Citrus. Frozen orange juice concentrate was an instant hit with the public and Florida orange juice became one of the world’s favorite beverages.

  Beginning around 1917, a company in neighboring Haines City, began packing orange juice.  As more and more citrus was produced, inventors went to work to try to find ways of canning, dehydrating and otherwise preserving the juice so that it could be shipped and stored (Citrifacts II :103), by Thomas B. Mack, 1998)(Citrus Industry 25(11):6-8).

  Events of history, technical innovations, and reliable refrigeration systems were the main reasons to bring the patent of frozen concentrated by L.G. MacDowell, E.L. Moore and C.D. Atkins to forefront.  The research process was instituted to provide a better tasting juice for WWII troops  (see copy of the patent).   The frozen citrus concentrate was marketed through the Snow Crop label which would later become Minute Maid (Frozen Food Age (1992): 96D).  The technology to support the research model was provided by companies like Vacuum Foods.  Evaporator design had to improve from simple heat exchange systems to falling film (Nagy et al.  Citrus Science and Technology (1977), v. 2:211-212,215-216) (see also Orlando Sentinal, June 29, 2003 and July 6, 2003).

  

  Enlarge - 1946 "Concentrator" display with samples at the Citrus Exposition

  Research continues at CREC to improve the product and adapt to changes in varieties and consumer taste.

  

  Enlarge - Display of concentrate methods at the Citrus Exposition

  Response to grower concern about the loss of fruit from the 1957-58 freeze created this project.  A portable freeze chamber was assembled to test the temperatures that would produce levels of leaf, tree and fruit damage.

  

  Enlarge - 1946 "Concentrator" display at the Citrus Exposition

  Citrus Station Mimeo Series 62-6, September 19, 1961 (pdf file)
  Controlled freezing of orange trees and fruit

  

  Enlarge - CD Atkins foreground DOC 1942-1973

  

  Enlarge -  Ed Moore seated DOC 1942-present

  

  Enlarge - CD Atkins, Ed Moore, and L. MacDowell awarded by D. Taylor and Gov. Fuller Warren

• The Nutritional Needs of Citrus Trees

  In the early 1900’s, little was known about plant nutrition. CREC scientists determined that citrus trees need several minor elements, including copper, zinc, manganese and iron. CREC, in conjunction with the USDA, developed fertilizer recommendations for citrus and provided growers with some of the most comprehensive nutritional information available for any crop at that time. These pivotal advances in plant nutrition lead to more efficient fertilizer use and substantial increases in fruit production.

• Yellow Spot

  Yellow Spot, a widespread problem in the first half of the century, caused citrus trees to lose leaves and eventually die. In the 1950’s, I. Stewart and C.D. Leonard determined that it was due to a deficiency of the mineral, molybdenum, and that it could be corrected by application of sodium molybdenum.

• First Mechanical Hedging Machine

  In the 1950's, citrus tree pruning studies led to the development of the first mechanical hedging machine built at CREC. Now, mechanical hedging is a standard practice in Florida groves. Research on production practices has enabled growers to manage and maintain the high-density plantings common in Florida groves today.

• “Spreading Decline”

  In the 1950’s and 1960’s, some growers lost up to 70 percent of their crops because of “spreading decline.”  CREC scientists R.F. Suit and E.P. DuCharme discovered that the cause of “spreading decline” was the burrowing nematode. Following this discovery, a team of scientists developed a control program for the burrowing nematode that many believe saved the industry.

• Greasy Spot

  In the 1960’s, CREC scientists discovered that a fungus, Mycosphaerella citri, was the cause of a disease called greasy spot. Further work led to an understanding of the life cycle of the fungus and the development of control measures.

  • Greasy Spot
• Oil Sprays

  The use of petroleum oil sprays for pest control was developed by CREC scientists in the 1960’s. Today, oil sprays are an important component of integrated pest management programs for scales, aphids and other insects.

• Advancements in Citrus Juice Processing

  UF and the FDOC scientists and engineers have worked with the citrus industry on improvements in juice processing technology, orange and grapefruit juice quality and flavor, food safety, studies on citrus’ nutritional benefits, and research on citrus by-products. For the past 50 years, scientific researchers have presented research updates at Citrus Processor’s Day, an annual conference held at CREC.

• Florida Juice Quality

  CREC-FDOC researchers have played a big role in developing juice quality standards for Florida orange and grapefruit juice. Analytical methods have been developed to detect the adulteration of juices and their country of origin. These methods help ensure that Florida citrus products are always top-notch quality. FDOC scientists test over a thousand juice samples every year to make sure that they meet Florida standards.

• Alternaria Brown Spot

  In 1973, Alternaria brown spot disease appeared on Dancy tangerines in Florida. Within a couple of years, growers were suffering substantial yield losses. CREC scientists identified the cause of the disease as the fungus, Alternaria citri, and by 1976, recommendations for control of this disease were published.

  • Alternaria Brown Spot
• Irrigation

  Fifty years ago, citrus irrigation was uncommon. Studies initiated in the 1950’s demonstrated that proper irrigation could increase yield. Further research focused on water conservation and led to the development of microsprinkler systems, considered to be the most economical and efficient system today.

• Freeze Protection Methods

  Early methods to protect citrus trees and fruit from freezing weather utilized heaters or wind machines. In the 1980’s, CREC and other UF researchers demonstrated that microsprinkler irrigation was effective for freeze protection. Today, microsprinkler irrigation is the most commonly used form of citrus freeze protection in Florida.

• Advances in Fresh Fruit Packing

  Advances in Fresh Fruit Packing

  UF and FDOC researchers continue to work closely with Florida’s fresh fruit industry, making advancements in decay control, degreening, storage, handling, packaging and packinghouse technology. CREC scientists publish a Packinghouse Newsletter and host an Annual Packinghouse Day, a meeting where scientists and industry personnel share information about the latest topics in fresh fruit packing.

• Books and Publications

  CREC faculty have published numerous widely recognized books and publications, including the Florida Spray Guide and the Florida Citrus Pest Management Guide. CREC scientists also publish Extension fact sheets and technical bulletins for both homeowners and citrus growers, many of which are available free to the public. Faculty members also are on editorial boards of scientific journals.

• Diaprepes Root Weevil

  Diaprepes Root Weevil

  At CREC, scientists are studying ways to manage the Diaprepes root weevil (Diaprepes abbreviatus). A serious threat to Florida groves today, CREC’s multi-disciplinary research effort focuses on studying the biology of this insect and devising integrated pest management programs.

  • Diaprepes Root Weevil
• New Varieties

  CREC researchers have been instrumental in developing new and improved citrus varieties with traits such as disease resistance and superior flavor. At CREC, scientists have made breakthroughs in techniques to produce novel citrus hybrids and regenerate seedlings in tissue culture. These techniques hold promise for making further improvements in citrus varieties.

• Environmentally Safe Production

  CREC scientists work on ways to minimize the leaching of herbicides, fertilizers and other chemicals into groundwater and to develop environmentally safe production practices.

• Molecular Biology of Citrus Tristeza Virus

  CREC scientists are working to uncover the molecular secrets of the citrus tristeza virus, the cause of some of citrus’ worst diseases, in efforts to develop effective management strategies. Working with other laboratories, a team of scientists have decoded the sequence of the virus’ genetic material - no small task, for the citrus tristeza virus is the largest plant virus known.

• High-Tech Agriculture

  UF and CREC engineers and scientists are adapting satellite and computer technology to help growers manage their citrus groves. Called “precision agriculture,” it involves the use of global positioning system (GPS) satellites, computers and other high-tech equipment to analyze trees in a grove for disease and pest problems, soil deficiencies and other problems that may otherwise go undetected.