The non-profit research centre would like samples from across the UK, but is particularly interested in those from northern England and Scotland.
Click here to view the sampling guidelines
A recent spike in reports of CSFB damage to emerging oilseed rape highlighted the problem of resistance to pyrethroid insecticides.
Data from 2016 shows that around 60% of the CSFB population in the UK is pyrethroid resistant and this resistance applies across all pyrethroids.
Continued monitoring of resistance levels will allow the industry to better understand the scale of the problem and find the most appropriate solution.
Click here to read some tips for controlling CSFB with pyrethroids, integrated pest management and repellents.