California Agriculture
California Agriculture
California Agriculture
University of California
California Agriculture

Archive

California Agriculture, Vol. 65, No.1

Growing bigger, better: Artisan olive oil comes of age
Cover:  The California olive industry has undergone striking changes in recent years. An internationally certified sensory taste panel has raised the quality of California olive oils, creating new markets (page 8); the nonnative, invasive olive fruit fly has transformed pest control for oil and table olives (pages 14, 21 and 29); and super-high-density hedgerow plantings have contributed to increased oil olive acreage (page 34). Photo: Lisa Romerein.
January-March 2011
Volume 65, Number 1

Peer-reviewed research and review articles

UC Cooperative Extension sensory analysis panel enhances the quality of California olive oil
by Paul M. Vossen, Alexandra Kicenik Devarenne
| Full text HTML  | PDF  
Sensory panel data continues to be essential to the evolution and growth of the California olive oil industry.
California's olive oil industry has evolved from primarily a salvage operation of the table olive industry to a producer of world-class, premium, extra-virgin olive oil. In 1997, UC Cooperative Extension started the first California olive oil taste panel, which was officially recognized by the International Olive Council in 2001. Specific protocols were used to screen potential panelists and train them to identify defects and positive characteristics, identical to 43 other world taste panels. The UCCE panel helped the California Olive Oil Council develop a seal certification program using sensory analysis. Certification provides consumers with assurance that labeled oils are free of defects and warrant the “extra virgin” grade. Sensory evaluation using a unique UCCE profile sheet provides complete and detailed information about specific positive flavor characteristics of olive cultivars grown in California. The UCCE sensory panel has also contributed to a better understanding of the qualities of California olive oil and advancement of the industry by participating in research on pest management, cultural practices and processing.
Understanding the seasonal and reproductive biology of olive fruit fly is critical to its management
by Hannah J. Burrack, Ray Bingham, Richard Price, Joseph H. Connell, Phil A. Phillips, Lynn Wunderlich, Paul M. Vossen, Neil V. O'Connell, Louise Ferguson, Frank G. Zalom
| Full text HTML  | PDF  
A statewide monitoring program has provided valuable insights on the olive pest's occurrence, population dynamics, reproduction and other factors.
The olive fruit fly was first detected in Los Angeles in 1998 and in all the olive-growing regions of California soon after. Following its initial detection, UC researchers and Cooperative Extension farm advisors, county agricultural commissioners and the California Department of Food and Agriculture Pest Detection and Emergency Project established a statewide monitoring program to determine the extent of the olive fruit fly's occurrence, track its seasonal biology and evaluate monitoring tools. Fly populations and infestations can reach high levels throughout California but tend to be lower in the San Joaquin Valley. Trap captures typically exhibit a bimodal distribution with peaks in the spring and fall. Olive infestation is related to fly densities, climate and fruit size. Gravid, mated females vary in density throughout the year but are present at some level year-round. The data is being used to develop models that will better predict when the adults are active and olives are at risk.
Biological controls investigated to aid management of olive fruit fly in California
by Kent M. Daane, Marshall W. Johnson, Charles H. Pickett, Karen R. Sime, Xin-Geng Wang, Hannah Nadel, John W. Andrews Jr., Kim A. Hoelmer
| Full text HTML  | PDF  
Researchers studied the biology of imported natural enemies to determine the best species to release in the state's climatically varied olive-growing regions.
The widespread and rapid establishment of the olive fruit fly in California required immediate changes in integrated pest management (IPM) programs for olives. After finding that resident natural enemies did not provide adequate control, researchers began a worldwide search for parasitoids, with exploration in the Republic of South Africa, Namibia, India, China and other countries. Parasitoids were shipped to California, and most were studied in quarantine to determine the best species for release. Two parasitoid species — Psyttalia lounsburyi and Psyttalia humilis — are now being released throughout the state's olive-growing regions, and researchers are studying their effectiveness.
High temperature affects olive fruit fly populations in California's Central Valley
by Kent M. Daane, Marshall W. Johnson, Kris Lynn-Patterson, Hannah Nadel, Susan B. Opp, Judy Stewart-Leslie, Xin-Geng Wang
| Full text HTML  | PDF  
Adult flies suffer from heat stress in very hot weather, and their ability to fly, feed and reproduce is affected.
Olive fruit fly commonly infests olives in California's Central Valley. Field studies indicate that trap counts for olive fruit fly adults in pesticide-free sites decrease in mid-and late summer and then rebound from September to November. Part of this decline is associated with heat stress that the flies experience in mid-July and August. Studies have shown that adult flies will die within a few days if they cannot access adequate amounts of water and carbohydrates. Flight ability is dramatically reduced when resources are unavailable. Olive fruit fly adults may use black scale honeydew as a carbohydrate source to help them survive hot periods. Heat also affects the fly's reproduction and immature stages within olive fruit. Geographic information system (GIS) maps may be useful for predicting the risk of olive fruit fly infestation.
Mediterranean clonal selections evaluated for modern hedgerow olive oil production in Spain
by Juan Francisco Hermoso, Antonia Ninot, Agusti Romero, Joan Tous
| Full text HTML  | PDF  
Three olive oil cultivars were tested for their horticultural characteristics and sensory qualities in super-high-density fields.
Traditional olive oil production is limited by its high cost, mainly due to labor expenses for harvesting and pruning. A new olive planting system based on hedgerows and harvesting machines could decrease production costs while maintaining high quality. To improve the efficiency of the continuous-straddle mechanical harvesters, vigor must be managed to limit tree size. However, few cultivars are adapted to this system. Selections from three cultivars are typically used in these super-high-density orchards. We field-tested ‘Arbequina i-18’, ‘Arbosana i-43’ and ‘Koroneiki i-38’ in an irrigated, super-high-density planting system in Catalonia (northeast Spain). We present a review of 6 years of horticultural data and summarize sensory characteristics and other properties of the resulting olive oils.
Sidebar: Olive cultivars field-tested in super-high-density system in southern Italy
by Angelo Godini, Gaetano Alessandro Vivaldi, Salvatore Camposeo
Full text HTML  | PDF  
Methods evaluated to minimize emissions from preplant soil fumigation
by Suduan Gao, Bradley D. Hanson, Dong Wang, Gregory T. Browne, Ruijun Qin, Husein A. Ajwa, Scott R. Yates
| Full text HTML  | PDF  
Low permeability plastic mulches are highly effective but costly; water treatment or target-area fumigation are better options for crops with low profit margins.
Many commodities depend on preplant soil fumigation for pest control to achieve healthy crops and profitable yields. Under California regulations, minimizing emissions is essential to maintain the practical use of soil fumigants, and more stringent regulations are likely in the future. The phase-out of methyl bromide as a broad-spectrum soil fumigant has created formidable challenges. Most alternatives registered today are regulated as volatile organic compounds because of their toxicity and mobile nature. We review research on methods for minimizing emissions from soil fumigation, including the effectiveness of their emission reductions, impacts on pest control and cost. Low-permeability plastic mulches are highly effective but are generally affordable only in high-value cash crops such as strawberry. Crops with low profit margins such as stone-fruit orchards may require lower-cost methods such as water treatment or target-area fumigation.

Editorial, News, Letters and Science Briefs

Sustainable food systems: The global picture
by Dan Dooley
Full text HTML  | PDF  
Letters
From our readers
Full text HTML  | PDF  
New methods are transforming table olive and olive oil production in California
by Jeannette Warnert
Full text HTML  | PDF  
Webmaster Email: wsuckow@ucanr.edu

Thank you for visiting us at California Agriculture. We have created this printable page for you to easily view our website offline. You can visit this page again by pointing your Internet Browser to-

http://calag.ucanr.edu/archive/index.cfm?issue=65_1

California Agriculture, Vol. 65, No.1

Growing bigger, better: Artisan olive oil comes of age
Cover:  The California olive industry has undergone striking changes in recent years. An internationally certified sensory taste panel has raised the quality of California olive oils, creating new markets (page 8); the nonnative, invasive olive fruit fly has transformed pest control for oil and table olives (pages 14, 21 and 29); and super-high-density hedgerow plantings have contributed to increased oil olive acreage (page 34). Photo: Lisa Romerein.
January-March 2011
Volume 65, Number 1

Peer-reviewed research and review articles

UC Cooperative Extension sensory analysis panel enhances the quality of California olive oil
by Paul M. Vossen, Alexandra Kicenik Devarenne
| Full text HTML  | PDF  
Sensory panel data continues to be essential to the evolution and growth of the California olive oil industry.
California's olive oil industry has evolved from primarily a salvage operation of the table olive industry to a producer of world-class, premium, extra-virgin olive oil. In 1997, UC Cooperative Extension started the first California olive oil taste panel, which was officially recognized by the International Olive Council in 2001. Specific protocols were used to screen potential panelists and train them to identify defects and positive characteristics, identical to 43 other world taste panels. The UCCE panel helped the California Olive Oil Council develop a seal certification program using sensory analysis. Certification provides consumers with assurance that labeled oils are free of defects and warrant the “extra virgin” grade. Sensory evaluation using a unique UCCE profile sheet provides complete and detailed information about specific positive flavor characteristics of olive cultivars grown in California. The UCCE sensory panel has also contributed to a better understanding of the qualities of California olive oil and advancement of the industry by participating in research on pest management, cultural practices and processing.
Understanding the seasonal and reproductive biology of olive fruit fly is critical to its management
by Hannah J. Burrack, Ray Bingham, Richard Price, Joseph H. Connell, Phil A. Phillips, Lynn Wunderlich, Paul M. Vossen, Neil V. O'Connell, Louise Ferguson, Frank G. Zalom
| Full text HTML  | PDF  
A statewide monitoring program has provided valuable insights on the olive pest's occurrence, population dynamics, reproduction and other factors.
The olive fruit fly was first detected in Los Angeles in 1998 and in all the olive-growing regions of California soon after. Following its initial detection, UC researchers and Cooperative Extension farm advisors, county agricultural commissioners and the California Department of Food and Agriculture Pest Detection and Emergency Project established a statewide monitoring program to determine the extent of the olive fruit fly's occurrence, track its seasonal biology and evaluate monitoring tools. Fly populations and infestations can reach high levels throughout California but tend to be lower in the San Joaquin Valley. Trap captures typically exhibit a bimodal distribution with peaks in the spring and fall. Olive infestation is related to fly densities, climate and fruit size. Gravid, mated females vary in density throughout the year but are present at some level year-round. The data is being used to develop models that will better predict when the adults are active and olives are at risk.
Biological controls investigated to aid management of olive fruit fly in California
by Kent M. Daane, Marshall W. Johnson, Charles H. Pickett, Karen R. Sime, Xin-Geng Wang, Hannah Nadel, John W. Andrews Jr., Kim A. Hoelmer
| Full text HTML  | PDF  
Researchers studied the biology of imported natural enemies to determine the best species to release in the state's climatically varied olive-growing regions.
The widespread and rapid establishment of the olive fruit fly in California required immediate changes in integrated pest management (IPM) programs for olives. After finding that resident natural enemies did not provide adequate control, researchers began a worldwide search for parasitoids, with exploration in the Republic of South Africa, Namibia, India, China and other countries. Parasitoids were shipped to California, and most were studied in quarantine to determine the best species for release. Two parasitoid species — Psyttalia lounsburyi and Psyttalia humilis — are now being released throughout the state's olive-growing regions, and researchers are studying their effectiveness.
High temperature affects olive fruit fly populations in California's Central Valley
by Kent M. Daane, Marshall W. Johnson, Kris Lynn-Patterson, Hannah Nadel, Susan B. Opp, Judy Stewart-Leslie, Xin-Geng Wang
| Full text HTML  | PDF  
Adult flies suffer from heat stress in very hot weather, and their ability to fly, feed and reproduce is affected.
Olive fruit fly commonly infests olives in California's Central Valley. Field studies indicate that trap counts for olive fruit fly adults in pesticide-free sites decrease in mid-and late summer and then rebound from September to November. Part of this decline is associated with heat stress that the flies experience in mid-July and August. Studies have shown that adult flies will die within a few days if they cannot access adequate amounts of water and carbohydrates. Flight ability is dramatically reduced when resources are unavailable. Olive fruit fly adults may use black scale honeydew as a carbohydrate source to help them survive hot periods. Heat also affects the fly's reproduction and immature stages within olive fruit. Geographic information system (GIS) maps may be useful for predicting the risk of olive fruit fly infestation.
Mediterranean clonal selections evaluated for modern hedgerow olive oil production in Spain
by Juan Francisco Hermoso, Antonia Ninot, Agusti Romero, Joan Tous
| Full text HTML  | PDF  
Three olive oil cultivars were tested for their horticultural characteristics and sensory qualities in super-high-density fields.
Traditional olive oil production is limited by its high cost, mainly due to labor expenses for harvesting and pruning. A new olive planting system based on hedgerows and harvesting machines could decrease production costs while maintaining high quality. To improve the efficiency of the continuous-straddle mechanical harvesters, vigor must be managed to limit tree size. However, few cultivars are adapted to this system. Selections from three cultivars are typically used in these super-high-density orchards. We field-tested ‘Arbequina i-18’, ‘Arbosana i-43’ and ‘Koroneiki i-38’ in an irrigated, super-high-density planting system in Catalonia (northeast Spain). We present a review of 6 years of horticultural data and summarize sensory characteristics and other properties of the resulting olive oils.
Sidebar: Olive cultivars field-tested in super-high-density system in southern Italy
by Angelo Godini, Gaetano Alessandro Vivaldi, Salvatore Camposeo
Full text HTML  | PDF  
Methods evaluated to minimize emissions from preplant soil fumigation
by Suduan Gao, Bradley D. Hanson, Dong Wang, Gregory T. Browne, Ruijun Qin, Husein A. Ajwa, Scott R. Yates
| Full text HTML  | PDF  
Low permeability plastic mulches are highly effective but costly; water treatment or target-area fumigation are better options for crops with low profit margins.
Many commodities depend on preplant soil fumigation for pest control to achieve healthy crops and profitable yields. Under California regulations, minimizing emissions is essential to maintain the practical use of soil fumigants, and more stringent regulations are likely in the future. The phase-out of methyl bromide as a broad-spectrum soil fumigant has created formidable challenges. Most alternatives registered today are regulated as volatile organic compounds because of their toxicity and mobile nature. We review research on methods for minimizing emissions from soil fumigation, including the effectiveness of their emission reductions, impacts on pest control and cost. Low-permeability plastic mulches are highly effective but are generally affordable only in high-value cash crops such as strawberry. Crops with low profit margins such as stone-fruit orchards may require lower-cost methods such as water treatment or target-area fumigation.

Editorial, News, Letters and Science Briefs

Sustainable food systems: The global picture
by Dan Dooley
Full text HTML  | PDF  
Letters
From our readers
Full text HTML  | PDF  
New methods are transforming table olive and olive oil production in California
by Jeannette Warnert
Full text HTML  | PDF  

University of California, 1301 S. 46th St., Bldg. 478 Richmond, CA
Email: calag@ucanr.edu | Phone: (510) 665-2163 | Fax: (510) 665-3427
Please visit us again at http://californiaagriculture.ucanr.edu/