GrowON Webinar, Thurs Aug. 25th: What We Know About Onion Thrips as Pest of Covered Crops

Onion thrips (Thrips tabaci) are an increasing pest of greenhouse ornamentals, strawberries, vegetables, and even cannabis. Why is this, and what can growers do about it?

To learn more about this emerging pest, register for the latest GrowON webinar – a webinar series JUST for covered crops!

Click on the image to register or see the link below!


Ashley Summerfield, Senior Research Technician in the Biocontrol Lab at the Vineland Research and Innovation Centre, and recent M.Sc. recipient from the University of Guelph. If you don’t know by now, Ashley is our resident thrips expert (including thrips identification!).

A western flower thrips female (left) and male (centre) compared to an onion thrips female (right). Can’t tell them apart? You’ll be able to by the end of this webinar! Photo by A. Summerfield.

Date and Time:

Thursday, August 25th, 12:00–1:00 PM EST

Zoom Registration:


Onion thrips outbreaks in greenhouse crops have been on the rise. Unfortunately, typical IPM programs for western flower thrips don’t seem to be as effective for this thrips pest, and we don’t know why. Ashley will discuss the results her Master’s research comparing the efficacy of common thrips IPM tools on onion thrips versus western flower thrips, and what growers should be doing NOW to manage their onion thrips populations. She’ll also discuss where research on this emerging pest should go from here.

Onion thrips damage to new foliage in cut chrysanthemums. Photo by OMAFRA.


Dr. Sarah Jandricic, Greenhouse Floriculture IPM Specialist, Ontario Ministry of Agriculture, Food and Rural Affairs, email:

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