Spotted Wing Drosophila Monitoring Report August 12, 2016

— Written By Grant Palmer and last updated by

We presented our final blueberry monitoring data last week, so this week, we shift to presenting blackberry trap captures only.

Floricane fruiting blackberries are reaching the end of harvest, and the majority of the fruit available is overripe, not ideal for Spotted Wing Drosophila (SWD). The rises we are seeing at the Cleveland 1 and Lincoln 3 sites may be due to this. However at Lincoln 1, we are trapping in primocane fruit blackberries, and the population was building before field management efforts began. The blackberries at Lincoln 1 have only just begun to be available within the last couple of weeks.

wasp on blackberry

As the fruit becomes overripe, it becomes more attractive to insects such as wasps, which are then seen more frequently in the fields. Photo: Grant Palmer.

The average number of total (male and female) SWD captured per site per day are presented in the figures below. YSW refers to traps baited with “yeast/sugar water”, and Scentry refers to traps with Scentry lures.

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.

We will be looking to see a sudden decline in Lincoln 1 YSW trap captures similar to the drops seen at the other research locations.

More information

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