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M.D. Boyette, D.F. Ritchie, S.J. Carballo, S.M. Blankenship, and D.C. Sanders

A significant portion of harvested produce never reaches the consumer due to, postharvest diseases. Various chemicals have been used to reduce the incidence of postharvest diseases. Many of these materials have been removed from the market in recent years due to economic, environmental, or health concerns. Although somewhat limited in the range of diseases controlled, chlorination is effective when combined with proper postharvest handling practices. Additionally, it is a relatively inexpensive postharvest disease control method that poses little threat to health or the environment. The proper use of chlorination in the management of postharvest diseases in fresh fruits and vegetables is discussed.

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Joseph L. Smilanick

Postharvest Pathogens and Disease Management . 2005. P. Narayanasamy. John Wiley, Somerset, NJ. 578 pages. $135.00. Hardcover. ISBN: 978-0-471-74303-3 Postharvest diseases are responsible for the spoilage of durable and fresh perishable

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M. Damayanti, G.J. Sharma, and S.C. Kundu

The application of gamma radiation for improving the storage of pineapple fruits [Ananas comosus (L.) Merr. cv. Queen] has been studied in an attempt to reduce decay caused by fungal pathogens such as Ceratocystis paradoxa (Dade)-Moreau and Penicillium purpurogenum Stoll. Gamma radiation at 50, 75, 100, 150, and 250 Gy improved shelf life. The maximum tolerable dose was ≈250 Gy. Fruits irradiated with up to 150 Gy and then stored at 25 to 28C maintained their texture better than did the controls. Radiation, particularly at doses >250 Gy, caused browning of the shin and softening of tissues. Browning increased with increasing radiation dose and storage duration. Excessively high doses promoted spoilage. Doses in the range of 50 to 250 Gy, in combination with storage at 11 to 13C, can be used to reduce postharvest losses in pineapple due to fungal diseases and senescence, thereby extending shelf life.

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Christian Krarup and Oscar Núñez

Poster Session 52—Postharvest Storage 21 July 2005, 1:15–2:00 p.m. Poster Hall–Ballroom E/F

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William H. Tietjen, Winfred P. Cowgill Jr., Martha H. Maletta, Peter J. Nitzsche, and Stephen A. Johnston

The effect of disease forecasting systems and stake or ground culture on foliar and postharvest disease control for tomato (Lycopersicon esculentum) was evaluated during two growing seasons in northern New Jersey. Foliar disease was reduced and marketable yield increased by stake culture. Percent of postharvest losses, including loss due to anthracnose, was significantly reduced by stake culture. Effectiveness of disease control schedules, weekly or forecaster-generated, was not affected by cultural system. Disease forecasting was shown to have potential for optimizing fungicide use in tomato production by controlling foliar disease and fruit anthracnose with fewer applications than a weekly schedule.

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R. Garca-Estrad, J. Siller-Cepeda, M. Bez, M. Muy, and E. Araiza

107 POSTER SESSION (Abstr. 441–448) Postharvest Physiology–Tomatoes

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Mark S. Mount and Phyllis M. Berman

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Michael E. Wisniewski and Charles L. Wilson

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Chiam L. Liew and Robert K. Prange

1 Graduate student. 2 Postharvest physiologist. This study was supported in part by a fellowship from Acadia Univ., Wolfville, N.S. We thank K.B. McRae (statistician) for advice on experimental planning, statistical analysis, presentation of results