2011 Annual Report 1a.Objectives (from AD-416) Evaluate benefits and risks of using ozone to control postharvest decay of table grapes. 1b.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). 3.Progress Report 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.