Abstract
Exported organic table grapes from the U.S. are currently fumigated with methyl bromide to control quarantined pests such as western flower thrips, Frankliniella occidentalis (Pergande). An alternative treatment which is compatible with organic products is needed. In this study, controlled atmosphere with ultralow oxygen (ULO) treatment was studied to control thrips on harvested table grapes. ULO treatments with <0.01ppm oxygen at 3.3°C for 1, 2, and 3days were tested for thrips control. The 3-day ULO treatment achieved complete control of thrips. The treatment was also applied to Thompson seedless and Flame seedless grape varieties and grape quality was evaluated two weeks after the treatment. The ULO treatment had no negative impact on the visual quality of grapes. There were no significant differences in overall grape quality or premium quality berries between the ULO treatment and the control. The results indicated that the ULO treatment was effective and safe to control western flower thrips on table grapes and had a potential for commercial use.
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