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Contact Us

Laurie George
Extension Educator, Local Food Systems and Small Farms
University of Illinois Extension
4618 Broadway
Mt. Vernon, IL 62864
Phone: 618-242-0780
FAX: 618-242-0781

Nathan Johanning
Extension Educator, Local Food Systems and Small Farms
University of Illinois Extension
402 Ava Rd.
Murphysboro, IL 62966
Phone: 618-687-1727
FAX: 618-687-1612

Bronwyn Aly
Extension Educator, Local Food Systems and Small Farms
University of Illinois Extension
1715 College Avenue
Carmi, IL 62821
Phone: 618-382-2662
FAX: 618-382-2276

Fruit Production

Fruit Production

Pest Management

July 2013; Updates of Spotted Wing Drosophila (SWD)

Beginning in the last week of June, reports of spotted wing Drosophila adults in traps or larvae in fruit have indicated activity of this insect in Montgomery, Champaign, and McHenry counties.  It is likely to be active in most other Illinois counties as well.  To repeat from the late June issue of this newsletter … everyone growing blueberries, blackberries, and raspberries should be monitoring for this insect.  There is a great deal of useful information on SWD on a Michigan State University web site devoted to it …  A section on monitoring includes instructions on how to make and use traps to detect this insect’s presence.  Simple instructions for making and using traps and notes on insecticides labeled against it in various crops were presented in the June 20 issue of this newsletter. 

In recent discussions about this insect on the applecrop list serve, Peter Jentsch of Cornell University provided the following comments …

A Penn State Extension Article on SWD Natural History summaries and references studies on basic biology of the insect found at  Here's a quote from the article that discusses aspects of temperature on insect biology.

"SWD prefers environments with moderate temperatures and high humidity. Adults are most active at temperatures around 70°F, and their activity is greatly decreased when temperatures are only 15 degrees colder or warmer." Adults need shelter when temperatures drop below about 50°F and begin hibernation at 40°F. Female adults exposed to cold temperatures lay very few eggs, and the eggs and larvae are killed by several days of exposure to temperatures just above freezing. Thus, seasonal populations are likely to start out extremely low in each spring, increase as temperatures warm, decline during hot spells, and then increase very rapidly during early fall when temperatures become more ideal. Regardless of whether SWD can overwinter in a region, it can be readily reintroduced in fruit that is shipped from warmer regions.

Rick Weinzierl (217-244-2126;