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Physiological Study of Pre- and Postharvest-treated Lisbon Lemon during Storage

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072503.(doi:10.13031/2013.23389)
Authors:   M Soleimani, L Tabil, G Z Dabbagh
Keywords:   Citrus, storage, curing, physiology, decay

Citrus decay by different genera of molds, especially Penicilium, Alternaria, Diplodia and Fusarium is a serious problem that restricts storage life of citrus fruits. The use of chemicals has been proven to inhibit crop decay, but some residuals may remain in the crop and in the environment. Curing has been brought up as a physical method and as an alternative for controlling Penicillium species during storage. In this study, the influence of preharvest treatments (using spraying trees with a very low toxicity chemical named Rovral TS with or without 2,4-D) and postharvest treatments (by Rovral TS solution and curing) was investigated on the decay and physiological properties of Lisbon lemon (C. limon). Treatments were carried out in 4 groups (including: 1) No treatment with Rovral; 2) Rovral spraying at preharvest stage; 3) treatment with Rovral in combination with a low concentration of 2,4-D at preharvest stage; and 4) Rovral treatment at postharvest stage), and each group including 3 sub-treatments (No curing, curing at 36°C for 48 h, and curing at 36°C for 72 h). Physiological evolution of the stored samples including decay, weight loss, brix (total soluble solids) and acidity, firmness, and respiration were measured during three-month storage period. Curing by itself controlled fungal decay during short-term cold storage, while it was not successful for long-term storage. Application of Rovral TS with curing controlled decay very well, but resulted to higher respiration and higher weight loss.

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