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11 September 2020 Determining the Effect of Postharvest Cold Storage Treatment on the Survival of Immature Drosophila suzukii (Diptera: Drosophilidae) in Small Fruits
Laura J. Kraft, D. Adeline Yeh, Miguel I. Gómez, Hannah J. Burrack
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Abstract

We evaluated the effect of postharvest cold storage temperature (0.0–2.2°C) and duration (3–5 d) on pupal emergence of single life stage populations of laboratory-generated Drosophila suzukii (Matsumura) and mixed-age populations collected in the field from blackberries, blueberries, strawberries, and raspberries. For field-infested fruit, cold storage at any temperature and duration resulted in less pupal emergence compared with the control held at 20°C, but D. suzukii subjected to higher temperatures and shorter storage durations in caneberries had higher survival. When a single life stage of D. suzukii was exposed to cold storage, pupal emergence was significantly reduced across all fruit types held at 0°C and for most life stages and fruit types held at 1.5 and 2.2°C, dependent on the substrate. Freshly laid eggs exposed to cold storage produced the lowest pupal emergence. Our results suggest using cold storage treatment is an effective postharvest management strategy for small-fruit growers to use on-farm as part of an integrated program to manage D. suzukii infestation. An economic assessment was made to examine the profit implications of an investment in cold storage units to counter pest pressure. Results suggest that investment in a cold storage unit would breakeven in about 4 yr. On farms that already have cold storage installed, we estimated a $0.11/kg decrease in blueberry market price for holding fruit for 3 d. Together, this cost assessment will provide growers with the knowledge to make decisions based on infestation risk and the seasonal sale price of blueberries.

Published by Oxford University Press on behalf of Entomological Society of America 2020. This work is written by (a) US Government employee(s) and is in the public domain in the US.
Laura J. Kraft, D. Adeline Yeh, Miguel I. Gómez, and Hannah J. Burrack "Determining the Effect of Postharvest Cold Storage Treatment on the Survival of Immature Drosophila suzukii (Diptera: Drosophilidae) in Small Fruits," Journal of Economic Entomology 113(5), 2427-2435, (11 September 2020). https://doi.org/10.1093/jee/toaa185
Received: 5 February 2020; Accepted: 21 July 2020; Published: 11 September 2020
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KEYWORDS
cold storage
postharvest
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