Progress 10/01/12 to 09/30/13
Outputs
Progress Report Objectives (from AD-416): Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. Approach (from AD-416): Fumigate with ozone under laboratory and commercial conditions to establish effective rates. Documents Trust with California Table Grape Commission. Log 38919. Formerly 5302-43000-035-06T (10/10). This project supports Objective 2 of the parent project, Evaluate postharvest practices and treatments for table grapes using substances of minimal environmental and dietary risk. Tests to evaluate the use of ozone fumigation to prolong the storage life of fresh grapes were conducted at the San Joaquin Valley Agricultural Sciences Center in Parlier in 2012. Ozone is an allowed substance for use by �organic� growers under the USDA National Organic Program. Application of ozone gas was shown to extend the storage life of table grapes. Under controlled conditions, the ozone treatment during storage was combined in strategies with conventional sulfur dioxide fumigation that was reduced in frequency from once weekly to every two weeks. This strategy resulted in control of postharvest decay that was superior to ozone alone, while reducing sulfur dioxide residues and bleaching injuries to the grapes. This work provides information to add a method to control decay losses in the table grape industry, which produced 99 million boxes worth approximately $1.4 billion in California alone in 2011.
Impacts
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Progress 10/01/11 to 09/30/12
Outputs
Progress Report Objectives (from AD-416): Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. Approach (from AD-416): Fumigate with ozone under laboratory and commercial conditions to establish effective rates. Progress was made on objective 2B in the parent project. At the San Joaquin Valley Agricultural Sciences Center in Parlier in 2011, tests to evaluate the use of ozone fumigation to prolong the storage life of fresh grapes were conducted. Ozone is an allowed substance for use by �organic� growers under the USDA National Organic Program. Application of ozone gas was shown to extend the storage life of table grapes. Under controlled conditions, the penetration of ozone into various kinds of commercial grape packaging was evaluated. This helped to identify for growers and packaging manufacturers the type of packaging best suited for use in storage rooms where ozone gas is used. Under environmental conditions that simulated the cold storage of table grapes, the rate of mortality of seven common decay fungi was determined in a low concentration (0.1 ppm) of ozone gas shown in prior work to prolong fruit storage life. Most of these fungi died completely within several weeks, while in cold air alone they survived several months. This work provides information to add a method to control decay losses in the table grape industry, which produced 99 million boxes worth approximately $1,400,000,000 in California alone in 2010. These results were presented to growers and packaging manufacturers in several informal meetings; a portion was included in a written progress report to the California Table Grape Commission submitted January 31, 2012 and two oral presentations (university seminars).
Impacts
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Progress 10/01/10 to 09/30/11
Outputs
Progress Report Objectives (from AD-416) Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. Approach (from AD-416) Fumigate with ozone under laboratory and commercial conditions to establish effective rates. Documents Trust with California Table Grape Commission. Log 38919. Formerly 5302-43000-035-06T (10/10). This agreement was established in support of Objective 2 of the in-house project, the goal being to develop integrated and commercially feasible postharvest practices and treatments to improve quality and extend the shelf and shipping life of fresh fruit (primarily citrus fruit and table grapes).At the San Joaquin Valley Agricultural Sciences Center in Parlier in 2011, tests to evaluate the use of ozone fumigation were conducted. Ozone is an allowed substance for use by �organic� growers under the USDA National Organic Program. Application of ozone gas was shown to extend the storage life of table grapes. Under controlled conditions, the penetration of ozone into various kinds of commercial grape packaging was evaluated, so as to identify for growers and packaging manufacturers the type of packaging best suited for use in storage rooms where ozone gas is used. This work provides information for adding a method to control of decay losses in the table grape industry, which produced 99 million boxes worth approximately $1,400,000,000 in California alone in 2010.
Impacts
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Progress 10/01/09 to 09/30/10
Outputs
Progress Report Objectives (from AD-416) Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. Approach (from AD-416) Fumigate with ozone under laboratory and commercial conditions to establish effective rates. Documents Trust with California Table Grape Commission. Log 38919. Formerly 5302-43000-032-14T (11/10). The agreement was established in support of Objective 1 of the in-house project, the goal being to minimize postharvest decay losses of table grapes using biological control, generally-recognized-as-safe or reduced- risk compounds, and thermal treatments. At the San Joaquin Valley Agricultural Sciences Center in Parlier in 2009, tests to evaluate the use of ozone fumigation were conducted. Ozone is an allowed substance for use by �organic� growers under the USDA National Organic Program. Application of ozone gas was shown to extend the storage life of table grapes. Under controlled conditions, the penetration of ozone into various kinds of commercial grape packaging was evaluated, so as to identify for growers and packaging manufacturers the type of packaging best suited for use in storage rooms where ozone gas is used. This work provides information to add a method to control of decay losses in the table grape industry, which produced 99 million boxes worth approximately $1,200,000,000 in California alone in 2008.
Impacts
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Progress 10/01/08 to 09/30/09
Outputs
Progress Report Objectives (from AD-416) Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. Approach (from AD-416) Fumigate with ozone under laboratory and commercial conditions to establish effective rates. Documents Trust with California Table Grape Commission. Log 38919 Significant Activities that Support Special Target Populations Postharvest quality is an important aspect of table grapes marketing, but the influence of ozone gas during storage remains unclear. Ozone, a well- known biocide gas, reduced postharvest decay by approximately 50% when applied in very high concentrations for one hour before cold storage. The use of constant low concentrations of ozone gas will be determined using equipment that will precisely control its concentration during the storage of packaged grapes. The influence of the gas on the severity of postharvest decay losses and its ability to penetrate commercial packaging will be determined. Cooperator activity has been monitored by the use of technical meetings, visits to the laboratory, and telephone conversations.
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