Post Harvest – Page 2

2008 Michelle D Danyluk (Microbial Risk Analysis)

Quantitative Microbial Risk Assessment of Citrus

Focused attention on recent produce-related foodborne illness outbreaks has lead to interest at many government levels to establish appropriate food safety regulations. For simplicity, general cross commodity regulations may be written, and while useful, they also have many limitations. For example, food safety risks associated with tree crops such as citrus are inherently different to those associated with transitional row crops. In the absence of data, regulators may be required to “guess” at what appropriate food safety standards may be.

2008 Mary Lu Arpaia (Postharvest Sensory)

Postharvest Sensory Evaluation

This project was provided as bridge funding for Sue Collin who works with the Project Leader and is responsible for overseeing our citrus sensory evaluation program. There were several objectives outlined in the proposal. Progress on each of these objectives is presented below.

2008 Mark Hoddle (Cold Treatment for Bean Thrips)

Does Cold Storage of Navel Oranges Kill Bean Thrips?

Bean thrips are very small insects that are native to California. Each fall, bean thrips migrate into navel orange groves and overwinter inside the navels of navel oranges. Contamination of exported fruit by bean thrips causes serious quarantine problems for California growers, especially when infested shipments arrive in Australia and New Zealand. Because bean thrips has never established in either of these two countries despite being intercepted in fruit for over 40 years, it has been proposed that thrips reaching these countries are unlikely to be viable because of accumulated cold stress.

2008 Joseph L Smilanick (New Methods)

New Methods to Control Postharvest Decay of Citrus

Evaluation continued of potassium sorbate (KS), a common food preservative. In prior work, its effectiveness to stop postharvest decay when used alone was fair; it was improved by heat, and it markedly improved the performance of several fungicides, including imazalil, pyrimethanil, and thiabendazole.

2008 James E Adaskaveg (Treatment Evaluation)

Evaluation of New Postharvest Treatments to Reduce Postharvest Decays and Improve Fruit Quality in Citrus Packinghouse Operations

Research was done on the evaluation of new postharvest treat- ments (i.e., azoxystrobin, fludioxonil, pyrimethanil, propicon- azole) for the management of postharvest Penicillium decays caused by Penicillium digitatum and P. italicum as well as sour rot caused by Geotrichum citri-aurantii.

2008 Elizabeth Mitcham (Ethyl Formate Studes)

Control of Bean Thrips in Navel Oranges Using Ethyl Formate Fumigation for Export to Australia

Citrus producers in the California Central Valley are faced with a significant problem due to the presence of bean thrips in navel oranges destined for Australia. Our objective is to confirm effective control of bean thrips with ethyl formate and to thoroughly test the tolerance of navel oranges to effective treatments.

2007 Tony Koselka (Automated Picking Hand)

Robotic Mechanical Harvester for Fresh Market Citrus: Automated Picking Hand

The development of a Picker robot requires the development of a viable end effector (picking hand) for removing fruit from the trees. This project, co-funded by the CRB, Washington Tree Fruit Research Commission, Vision Robotics, and Olin College of Engineering, is intended to develop prototypes of the first generation picking hand for fresh fruit. The technical development is performed through the Senior Consulting Program for Engineering at the Olin.

2007 Tim McConnell (Robotic Picker)

Robotic Mechanical Harvester for Fresh Market Citrus

Scouting is critical to the mechanization of fresh citrus. During 2007, Vision Robotics (VRC) created a prototype Scout and demonstrated it mapping orange trees in production groves. This prototype built on work developed using VRC’s virtual reality simulation in prior years.

2007 James Thompson and David Slaughter (Freeze Damage)

Survey of SensingMethods for Detection of Freeze Damage in Oranges

The goals of this project were to develop and test field methods for detecting orange samples exceeding the USDA threshold level for freeze-damaged fruit and to evaluate high-speed, real-time methods of detecting freeze-damaged fruit.

Development of new methods for identifying freeze-damaged oranges within the first few weeks following a freeze event is a priority for the Citrus Research Board. Accurate assessment of freeze damage in a grove allows citrus producers to optimize their management strategies during the weeks immediately after a freeze event. A device that is rapid, accurate and field-portable will allow growers to determine whether a block of fruit should be harvested immediately for the fresh market or juice or whether the damage level warrants postponing harvest until fruit can be sorted by density in the packinghouse.

2007 Joseph L Smilanick ( New Methods)

New Methods to Control
Postharvest Decay of Citrus

The purpose of this project is to evaluate new methods to extend the postharvest life of fresh citrus fruit.