Spotted Wing Drosophila Monitoring Report June 29, 2016

— Written By Grant Palmer and last updated by

We have now processed blueberry traps through the week of July 12 and blackberry traps through July 6. Spotted wing drosophila (SWD) trap captures remain higher in blackberry fields. Blackberry plants grow thick and tall, resulting in the formation of a cooler, shaded region within the plant. This area can allow SWD shelter during the heat of the day. SWD management also presents problems for growers who wish to preserve beneficial insects in their fields. Swallowtail butterflies, for example, are common in at our blackberry sites.

swallowtail butterfly

Swallowtail butterflies are not pests and can be seen flitting through the fields visiting blooms. Photo: Grant Palmer

The average number of total (male and female) SWD captured per site per day are presented in the figures below. Trapping began at six blueberry fields on May 11, 2016. Scentry lures were not available until May 17th, so these were deployed at blueberry locations during the second week of monitoring.

YSW refers to traps baited with “yeast/sugar water”, and Scentry refers to traps with Scentry lures.

2016 blueberry ysw data

2016 blueberry scentry data

We are monitoring a total of five blackberry fields, and first checked traps on May 17, 2016. SWD trap captures are generally higher in blackberry fields as compared to blueberry fields.

2016 blackberry ysw data

2016 blackberry scentry data

Data is continually processed and will be updated weekly as it becomes available.

The last week of blueberry monitoring was completed on 7/13/2016. The spike in Bladen 1 trap captures was likely a result of reduced availability of suitable fruit for SWD due to over-ripening.

Blackberries will continue to be monitored until later in the season.

More information

Past insect monitoring reportsEntomology Portal