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Article

Postharvest Control of Table Grape Gray Mold on Detached Berries with Carbonate and Bicarbonate Salts and Disinfectants

F. Mlikota Gabler, J. L. Smilanick
Am J Enol Vitic. January 2001 52: 12-20; published ahead of print March 01, 2001
F. Mlikota Gabler
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J. L. Smilanick
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Abstract

The control of postharvest gray mold on detached table grape berries by treatment with carbonate and bicarbonate salt solutions, alone or with chlorine, ozone, or ethanol, was evaluated. Sodium carbonate (SC), potassium carbonate (PC), sodium bicarbonate (SBC), potassium bicarbonate (PBC), and ammonium bicarbonate (ABC) were tested without control of pH for their toxicity to spores of Botrytis cinerea in vitro, and the concentrations that stopped germination of 95% (EC95) of the spores were 16, 17, 36, 58, and 163 mM, respectively. When bicarbonate solutions were adjusted to pH 7.2 (±0.2), the mean EC95 concentrations for two B. cinerea strains of ABC, SBC, and PBC were 48, 102, and 112 mM, respectively. In 1.5 µg/ml of ozone in water, 50% and 95% mortality of spores of B. cinerea occurred after 21.3 and 35.6 sec, respectively. In tests to control gray mold on grapes, among the bicarbonates, each applied at 500 mM, ABC was significantly more effective than SBC and PBC. It was also superior to PC (100 mM) and chlorine (200 µg/ml) and equal in effectiveness to SC (100 mM) and ethanol (70% wt/vol). The addition of 200 µg/ml chlorine to the bicarbonate salts significantly decreased gray mold incidence. Ozone in water at 10µg/ml significantly controlled gray mold, although its efficacy was irregular and dependent on grape condition. Among all the treatments, berry condition was an important factor; for example, there was significant decrease in control when wounded berries were treated compared to unwounded berries. The quality of grapes after treatment with ABC, SBC, ethanol, and chlorine was acceptable; ozone in water caused minor rachis injury; while severe injuries, mostly brown spots on berries, occurred after SC, PC, and PBC treatments.

Acknowledgment: We thank Dennis Margosan for providing cultures of Botrytis cinerea and his thorough review of the manuscript.

  • Copyright 2001 by the American Society for Enology and Viticulture

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Postharvest Control of Table Grape Gray Mold on Detached Berries with Carbonate and Bicarbonate Salts and Disinfectants
F. Mlikota Gabler, J. L. Smilanick
Am J Enol Vitic.  January 2001  52: 12-20;  published ahead of print March 01, 2001

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Postharvest Control of Table Grape Gray Mold on Detached Berries with Carbonate and Bicarbonate Salts and Disinfectants
F. Mlikota Gabler, J. L. Smilanick
Am J Enol Vitic.  January 2001  52: 12-20;  published ahead of print March 01, 2001
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