Comparison of low oxygen controlled atmosphere treatments on the mortality of first instar Queensland Fruit Fly (Bactrocera Tryoni (Froggatt)) at 3 °C in cherry fruit
John B. Golding, Andrew Jessup, Lorraine Spohr, Shashirekha Satyan, Huertas Maria Diaz-Mula
Abstracts of 7th International Postharvest Symposium 2012 (IPS2012). 25-29 June, 2012. Putra World Trade Centre (PWTC), Kuala Lumpur, Malaysia. 238 pages.
2012
บทคัดย่อ
Queensland Fruit Fly Bactrocera tryoni (Froggatt) (QFF) is a major quarantine pest for some Australian cherry producers. Treatments to combat infestation can often affect fruit quality, restrict marketing flexibility and affect grower returns. Our previous work has shown that a postharvest combination treatment of high carbon dioxide (CO2) at 3°C for varying lengths oftime before storage in air was effective at killing first instar QFF larvae. The controlled atmosphere storage treatment in these previous studies utilised 95% CO2 with 1 % oxygen (O2) at 3°e. In this experiment, fruit were infested with QFF first instar larvae then treated in controlled atmosphere drums at 3°C with either (a) 1 % O2 with 95% CO2, (b) 1 % O2 with 99% nitrogen (N2) or ( c) air (21 % O2/ 78% N2). After two days treatment, all the fruit were transferred from the drums and placed in air storage at 3°C for up to 10 days. The 95% CO2 treatment resulted in 100% mortality of the QFF larvae by 6 days of cold storage, whereas in the fruit treated with 1 % O2 with N2 or air, complete mortality of the QFF larvae was reached at the 10 day assessment. The results show that the short-term 1% O2 in 95% CO2 treatment at 3°C was more effective in reducing the time in cold disinfestation than the 1 % O2 in either N2 or air.