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22 October 2022 Susceptibility of ‘Malama’ Avocados to Bactrocera dorsalis (Diptera: Tephritidae) in Hawai’i and a Proposed Systems Approach for Market Access
Peter A. Follett, Glenn Asmus, Lindsey Hamilton, Dara Stockton
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Abstract

Avocados are generally poor hosts or nonhosts for tephritid fruit flies, which can influence the type of mitigation measures required by export protocols for trade. We conducted experiments to determine the susceptibility of the avocado, Persea americana, cv. ‘Malama’ to infestation by Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera:Tephritidae), in Hawai’i using laboratory and field no-choice cage tests, together with field sampling. In no-choice cage tests, infestation rates increased with decreasing fruit firmness over time after harvest. Although risk of infestation was negatively correlated with fruit firmness, about 50% of mature hard fruit exposed immediately after harvest became infested. In field cage tests, mature hard fruit on the tree at the 25% purple color stage were not infested, whereas fruit at the 50, 75, and 100% purple color stages were infested at relatively low rates. Field sampling of fallen ‘Malama’ fruit over two seasons showed no natural infestation by B. dorsalis and trap captures in avocado orchards using McPhail traps containing protein bait lures averaged 0.13 ± 0.03 (mean ± SE) flies per trap per week, underscoring the low prevalence of fruit flies in avocado orchards and the poor host quality of this cultivar. A systems approach based on poor host status, low prevalence, and a limited harvest period (October to March) and distribution area (northern tier states) is proposed to export ‘Malama’ avocados from Hawai’i to the continental United States.

Published by Oxford University Press on behalf of Entomological Society of America 2022. This work is written by (a) US Government employee(s) and is in the public domain in the US.
Peter A. Follett, Glenn Asmus, Lindsey Hamilton, and Dara Stockton "Susceptibility of ‘Malama’ Avocados to Bactrocera dorsalis (Diptera: Tephritidae) in Hawai’i and a Proposed Systems Approach for Market Access," Journal of Economic Entomology 115(6), 1894-1900, (22 October 2022). https://doi.org/10.1093/jee/toac150
Received: 27 June 2022; Accepted: 1 September 2022; Published: 22 October 2022
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KEYWORDS
oriental fruit fly
Persea americana
phytosanitary
quarantine Pest
Tephritidae
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