Spotted Wing Drosophila Monitoring Report June 17, 2016

— Written By Grant Palmer
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Over the last couple weeks there was a substantial amount of rainfall at our blueberry research sites. While rain is necessary, large amounts can delay picking and pest management which can increase insect pressure. This issue is further compounded by the fact that spotted wing drosophila tends to thrive in moist, cool environments before and after periods of rainfall.

Noticeable increases in trap captures at the blueberry research sites appear to coincide with this increase in rainfall. This change is more visible in the YSW traps than in the Scentry baited traps.

Bumblebee

Bumblebees are frequently seen in and around blackberry fields. This one was feeding from honeysuckle around one of the research sites. 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.

This is a graph depicting number of SWD captured on a total/SWD per day basis in YSW traps.

This is a graph depicting the number of SWD captured on a total/SWD per day basis caught in Scentry bait traps.

Blueberry trap captures have spiked with the rain and I would expect those numbers to be returning back to levels before the large period of rainfall in the next segment of 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.

This is a graph depicting number of SWD captured on a total/SWD per day basis in YSW traps

This is a graph depicting number of SWD captured on a total/SWD per day basis in Scentry bait traps.

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

More information

Past insect monitoring reportsEntomology Portal

Updated on Jul 15, 2016
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