Control of Dry Rot Disease on Potato During Storage

Document Type : Original Article

Author

Plant Pathol. Res., Inst.., Agric. Res. Centre, Giza, Egypt

Abstract

Potato dry rot disease caused by Fusarium solani during storage and marketing is investigated in the present work. Salts potassium phosphate dibasic K2HPO4, potassium phosphate mono basic KH2PO4, potassium carbonate K2CO3, potassium bi carbonate KHCO3, sodium carbonate Na2CO3, and sodium bicarbonate NaHCO3,, hot water and thiobendazole (Tecto) fungicide were tested for controlling of F. solani during cold storage at three-months (7oC for one month then at room temperature 22+2oC for two months) and 90- 100% RH. Absolute efficacy (100%) of all tested treatments in naturally infected potato tubers for three months. The only exception was recorded for hot water treatment in that should 75.02 and 59.97% during 2011-2012, respectively. Potato tubers dipping in salts or hot water and Tecto treatments reduced the dry rot disease and maintained the proper quality of tubers during the cold storage at 7oC for one month followed by shelf life up to 3 months. All post harvest treatments decreased the loss in fresh weight and Sprouting of Potato tubers compared with the untreated tubers during storage at 7oC. On the other hand, all treatments increased the moisture content, and decreased polyglacturonase and cellulase activity. On the other hand, no PME activity was detected in naturally infected or artificially inoculated tubers with F. solani and the only exception was found in KH2PO4 and K2CO3 treatments. This study demonstrates that potato tubers can be safely stored without sprouting and control of dry rot for 3 months (7oC for one month then storage of two month at room temp. 22+2oC) if dipped in KH2PO4, KHCO3 and Na2CO3.

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