Mycobiology.  2014 Sep;42(3):262-268. 10.5941/MYCO.2014.42.3.262.

Effect of Thymol and Linalool Fumigation on Postharvest Diseases of Table Grapes

Affiliations
  • 1Department of Bioscience and Food Science, Konkuk University, Seoul 143-701, Korea. scchun@konkuk.ac.kr
  • 2Department of Plant Pathology, Rural Development Administration, Suwon 441-857, Korea.

Abstract

Several postharvest diseases of table grapes (Vitis vinifera) occur during storage, and gray mold rot is a particularly severe disease because the causal agent, Botrytis cinerea, grows at temperatures as low as 0degrees C. Other postharvest diseases, such as those caused by Penicillium spp. and Aspergillus spp., also often lead to deterioration in the quality of table grapes after harvest. The use of plant essential oils such as thymol and linalool, to reduce postharvest diseases in several kinds of fruits, including table grapes and oranges, has received much attention in European countries. However, to the best of our knowledge there has been no report of the use of thymol fumigation to control gray mold in table grapes in Korea. Thymol (30 microg/mL) and linalool (120 microg/mL) significantly inhibited mycelial growth and conidia germination of B. cinerea. The occurrence rate of gray mold rot of B. cinerea and other unknown fungi was significantly reduced by fumigation with 30 microg/mL thymol in several table grape cultivars, such as Campbell early, Muscat Bailey A, Sheridan, and Geobong. In this study, fumigation with 30 microg/mL thymol, had no influence on the sugar content and hardness of grapes, but reduced fungal infection significantly. This suggests that 30 microg/mL thymol could be utilized to reduce deterioration of grapes due to gray mold and other fungal infections during long-term storage.

Keyword

Botrytis cineria; Fumigation; Linalool; Postharvest diseases; Table grapes; Thymol

MeSH Terms

Aspergillus
Botrytis
Citrus sinensis
Fruit
Fumigation*
Fungi
Germination
Hardness
Korea
Oils, Volatile
Oman
Penicillium
Plants
Spores, Fungal
Thymol*
Vitis*
Oils, Volatile
Thymol
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