High cold tolerance and differential population response of third instars from the Zeugodacus tau complex to phytosanitary cold treatment in navel oranges

Dias, Vanessa; Hallman, Guy J.; Araújo, Alexandre Santos; Lima, Isac; Galvão-Silva, Fábio Luís; Caravantes, Luis A.; Rivera, M. C.; Aguilar, Joan Sansa i; Cáceres-Barrios, Carlos E; Vreysen, Marc J. B.; Myers, Scott W.

doi:10.1016/j.postharvbio.2023.112392

Postharvest Biology and Technology

2023

DOI: 10.1016/j.postharvbio.2023.112392

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High cold tolerance and differential population response of third instars from the Zeugodacus tau complex to phytosanitary cold treatment in navel oranges

Vanessa Dias

Guy J. Hallman²,

Alexandre Santos Araújo

et al.

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2024

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Cited by 4 publications

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Modelling time-temperature-dependent mortality of pest flies in cold storage to support the management of trade-related biosecurity risks

Ratnayake,

Darnell,

Henderson

et al. 2024

J Pest Sci

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Cold treatment with rigorous regulatory oversight is often mandated to manage horticultural trade-related biosecurity threats, such as invasive, cold-sensitive fruit flies (Diptera: Tephritidae). Cold treatment schedules, developed through rigorous laboratory experiments, require a set temperature and duration to ensure at least a probit 8.7 (99.99%) mortality rate, regardless of infestation likelihood. This threshold is costly to demonstrate for each pest and commodity combination and the resultant treatment may be harmful to fruit quality. Moreover, these stringent schedules do not account for cold-induced mortality already occurring in commercial supply chains. We developed a predictive temperature-dependent mortality function using 28 published cold treatment studies of pest fly species to support more flexible and proportionate use of cold treatment. The daily mortality rate was unaffected by the duration of cold exposure (0–20 days). The mortality rate varied primarily by pest species (10 species) and developmental stage (eggs and larval stages), and to a lesser extent by temperature (0–7 °C) and host (13 fruit types). Our model mostly predicted fewer days to meet probit 9.0 mortality compared to empirical results from large-scale studies, suggesting these studies can be overly conservative. By leveraging previous empirical studies, our model enables estimation of temperature-dependent daily mortality for unstudied pest developmental stage host–temperature combinations, which can then be empirically validated through targeted studies. It is hoped these results will shift cold treatment usage from highly regulated, fixed temperature treatments with a target mortality rate requirement to a more flexible approach that accounts for existing commercial supply chain practices and infestation likelihood in produce.

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Modelling time-temperature-dependent mortality of pest flies in cold storage to support the management of trade-related biosecurity risks

Ratnayake,

Darnell,

Henderson

et al. 2024

J Pest Sci

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Comparative Responses of Two Major Cucurbit Pests, Zeugodacus cucurbitae and Zeugodacus tau to Phenylbutanoid Male Lures

Shamshir,

Wee

2024

J Chem Ecol

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Phytosanitary cold treatment of cherry tomatoes infested with Bactrocera dorsalis, Zeugodacus cucurbitae, and Zeugodacus tau (Diptera: Tephritidae)

Regmi,

Lin,

Chuang

et al. 2024

Journal of Economic Entomology

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Fruit flies attack numerous crops, including cherry tomatoes (Solanum lycopersicum var. cerasiforme). The potential presence of the immature stages of fruit fly species inside tomatoes during export hinders their international market access. Therefore, phytosanitary treatment must be performed before export to prevent fruit fly species from entering countries where they are not naturally found. We developed a phytosanitary cold disinfestation treatment protocol to eliminate oriental fruit fly (Bactrocera dorsalis Hendel), melon fly (Zeugodacus cucurbitae Coquillett), and pumpkin fruit fly (Zeugodacus tau Walker) concealed inside cherry tomatoes without causing critical damage to the fruit. We determined that the third instar of Z. cucurbitae exhibited the highest cold tolerance among the various development stages of the three fruit fly species. Thus, we performed a small-scale disinfestation test on Z. cucurbitae in two cultivars of tomato. We achieved complete disinfestation after 15 days of cold treatment at 1°C–1.5°C. The confirmatory test revealed the elimination of more than 80,000 treated third instar of Z. cucurbitae in each tomato variety. The developed phytosanitary cold treatment allows the tomatoes to retain their commercial value. This study provides a standard phytosanitary cold treatment protocol for cherry tomatoes, ensuring the disinfestation of fruit flies before their export to international markets.

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High cold tolerance and differential population response of third instars from the Zeugodacus tau complex to phytosanitary cold treatment in navel oranges

Cited by 4 publications

References 23 publications

Modelling time-temperature-dependent mortality of pest flies in cold storage to support the management of trade-related biosecurity risks

Modelling time-temperature-dependent mortality of pest flies in cold storage to support the management of trade-related biosecurity risks

Comparative Responses of Two Major Cucurbit Pests, Zeugodacus cucurbitae and Zeugodacus tau to Phenylbutanoid Male Lures

Phytosanitary cold treatment of cherry tomatoes infested with Bactrocera dorsalis, Zeugodacus cucurbitae, and Zeugodacus tau (Diptera: Tephritidae)

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