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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

October Last Monday Grant Webinar for Fruit and Vegetable Growers

October 28, 2019
4:00 pm

Are you curious about what grants are available to help your farm business?

To help disseminate information on grants on a consistent basis, ENYCH is offering a "current grants" webinar on the last Monday of every month at 4:00pm

Each month's webinar focuses on 1 grant.  The October webinar topic is TBD but might feature Ag Labor Housing Grants.
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Produce Safety Alliance FSMA Grower Training Course

October 30, 2019
8am - 5pm
Canajoharie, NY

A grower training course developed by the Produce Safety Alliance (PSA) that meets the regulatory requirements of the Food Safety Modernization Act (FSMA) Produce Safety Rule.  At least one person per farm producing more than $25,000 worth of fruits and vegetables must attend this course once.  Participants will receive a certificate of course completion by the Association of Food and Drug Officials. 

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Tarping for Reduced Tillage Workshop

November 2 - November 19, 2019

Are you a vegetable farmer already using tarps? Or are you wondering if and how tarps could work best on your farm?

The Cornell Small Farms Program is excited to announce a series of workshops on tarping for reduced tillage in small-scale vegetable systems, to be held in Maine and New York this fall. The Reduced Tillage (RT) project of the Cornell Small Farms Program supports farmers in adopting scale-appropriate RT practices that can lead to healthy, productive soils and greater profitability. Through the evaluation of novel tools and methods using systems-based field research and on-farm trials, the project helps farmers learn about the approaches that can work for their farm. This work is accomplished in collaboration with the University of Maine, and with support from Northeast SARE.

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Announcements

Resources from CCE ENYCHP!

We are developing new ways to connect with the CCE ENYCHP team this year! We have a Youtube page located at this link. Check out videos on Table Grape Production, Pest Updates and the 20 Minute Ag Manager - in 4 Minutes series

We have a Facebook Page here as well as an Instagram page. We keep these places updated with current projects, events, and other interesting articles and deadlines.

There are also text alerts available. Fruit and vegetable farmers in 17 Eastern NY counties can now receive real time alerts on high risk disease and pest outbreaks texted directly to their cell phone. The Eastern NY Commercial Horticulture program, which is supported by local Cornell Cooperative Extension associations, will now offer text alerts to those that enroll in our program in 2019. 

The text alerts will be reserved for important crop alerts that could impact management decisions immediately. For instance, if there were an outbreak of Late Blight in the area, this would be transmitted to vegetable growers.

Farmers can choose the crop for which they wish to receive updates. Additionally they can request that Ag Business Alerts be sent to them. These alerts might include due dates for crop insurance deadlines, market opportunities etc.

If you have questions, please contact enychp@cornell.edu


Podcasts

Climate Change Adaptations

September 30, 2019
In this episode regional vegetable specialist Elisabeth Hodgdon interviews University of Vermont PHD student Alissa White about a series of interviews with growers in the north east concerning climate change adaptations.

Listeners can access Alissa White’s climate change adaptation survey report and additional information on the project by clicking on the following link:

https://adaptationsurvey.wordpress.com/results/
Alissa’s project was sponsored by a Northeast SARE Graduate Student Grant (GNE17-163).

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