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Effects of Fruit Cooling on Spotted Wing Drosophila

August 22, 2012

Effects of Fruit Cooling on Spotted Wing Drosophila

In some of the first literature written in Japan in 1939 (Kanzawa, T.) about spotted wing drosophila, Drosophila suzukii, (SWD), experiments were made regarding the sensitivity of the egg and larval stages of spotted wing drosophila to periods of temperatures above and below freezing (32o F).


As is noted in the two graphs below, at constant temperatures of up to 35o F, 96 hours or more of cooling resulted in total mortality of spotted wing drosophila eggs and larvae. This was also anecdotally confirmed in tests conducted in 2009 in California.

While temperatures below freezing are not useful to fruit shippers, temperatures in the area of 35o F are useful. However, it is important to note that for success the constancy of the temperature is critical. So, while in an ideal situation constant temperatures of 35o F or a little below are effective in SWD egg and larvae suppression when extended for periods longer than 96 hours, the reality can vary significantly from the ideal. Shipped fruit ordinarily do not experience lengthy regimes of constant temperature as they are moved from place to place. Temperatures of a refrigerator truck can vary by location inside and placement of the produce (ie on the side, towards the bottom etc.), and certainly the temperatures at the point of sale can vary from the ideal to room temperature to even warmer.

Additionally, while initial damage from SWD on raspberries, blackberries and strawberries can be difficult to detect, this is not the case for other fruits such as cherries or blueberries, where the activity of SWD will leave an unsightly blemish.

The take home message from this information is that while extended cooling can be suppressive of SWD, growers should not rely on cooling alone. It will still be important to manage SWD in field.
Thanks to Shinji Kawai for making the information from the 1939 Kanzawa paper available.

This article was posted on the UC Santa Cruz county blog by Mark Bold on March 23, 2010.  You can view more blog posts by going to: http://cesantacruz.ucdavis.edu/Strawberry_Nursery_Plant_Production/

 



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Upcoming Events

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October 21, 2025 : Cover Crop Field Meeting
Willsboro, NY

Thinking about upping your farm's cover cropping game? New technology for seeding and crop tracking, research-driven recommendations for high tunnel cover cropping, cold tolerant varieties for North Country climates, and farmer expertise will be shared at this field event.

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The first-ever New York State Agritourism Conference, hosted by the CCE Agritourism Program Work Team, is designed to support farms in growing successful visitor experiences. This statewide gathering will feature expert-led sessions, peer networking, and practical tools to help farms expand direct sales, education, hospitality, and entertainment offerings.

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  • November 10: A full day of educational sessions targeted at beginning or experienced agritourism operators.
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ASL 104sp Seleccion y organizacion del personal (Staffing and Organizing Your Team) taught in Spanish

November 12, 2025 : ASL 104sp Selección y organización del personal (Staffing and Organizing Your Team) in Spanish

ASL104-SP: Selección y organización del personal (Staffing and Organizing Your Team - impartido en español) ¡Inscripciones abiertas!

En este curso identificamos cómo escribir descripciones de puestos disponibles en el trabajo para atraer a los mejores candidatos. Aprenderá a encontrar empleados con un perfil deseado, cómo entrevistar y seleccionar a las personas adecuadas. Descubrirá cómo completar la documentación de nuevos empleados, la autorización de empleo y la contratación de personal (on-boarding): es decir, cómo efectivamente incorporar nuevos empleados al rancho en una manera exitosa y productiva.

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