کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8882114 | 1624969 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Development of an improved postharvest cold treatment for Thaumatotibia leucotreta (Meyrick) (Lepidoptera: Tortricidae)
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم زراعت و اصلاح نباتات
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چکیده انگلیسی
Some of South Africa's fresh produce export markets require postharvest cold treatment of fruit as a phytosanitary risk mitigation treatment for Thaumatotibia leucotreta. Currently, the most widely used treatment entails a 22-d exposure to sub-zero temperatures. This treatment has been primarily based on studies conducted in the 1950s and 1960s. Given the age of the data and subsequent indications that a reduced duration treatment may be effective, a new set of cold treatment efficacy data was generated in this study. The treatments were tested at the probit 9 level, using fourth and fifth instar T. leucotreta, these instars having previously been shown to be the most cold-tolerant. Three time-temperature combinations using sub-zero temperatures were initially evaluated: 20 d, 18 d and 16 d at average temperatures in the range of â0.16 °C to â0.44 °C; and thereafter a time-temperature combination using an above-zero temperature was evaluated: 19 d at an average temperature of 1.05 °C. All treatments were shown to cause mortality at or in excess of the probit 9 level (99.9968% efficacy at the 95% confidence level). These results demonstrate the efficacy of the following potential postharvest cold treatments for T. leucotreta for phytosanitary treatment purposes: 16 d at â0.2 °C, 18 d at â0.4 °C, 20 d at â0.4 °C and 19 d at 1.0 °C, which are recommended for conversion into the following treatment protocols: 16 d at or below â0.1 °C, 18 d at or below â0.3 °C, 20 d at or below â0.3 °C and 19 d at or below 1.2 °C, commencing once all probe readings are at or below: â0.2 °C, â0.4 °C, â0.4 °C and 1.0 °C respectively. Relative to the cold treatments currently in use for T. leucotreta, the shorter duration and in some cases higher temperatures will be less costly and logistically easier to apply with reduced adverse effects in the form of fruit chilling injury and hence trade restriction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Postharvest Biology and Technology - Volume 125, March 2017, Pages 188-195
Journal: Postharvest Biology and Technology - Volume 125, March 2017, Pages 188-195
نویسندگان
Sean D. Moore, Wayne Kirkman, Peter R. Stephen, Sonnica Albertyn, Claire N. Love, Tim G. Grout, Vaughan Hattingh,