What are the best chemicals for controlling these? I know very little about it. Starane in cereals, shield in beet? Glyphosate in stubbles appears to be too late as they have formed daughter tubers. thought I was getting on top of them but they are really bad this year in a field that was spuds 5 years ago. TBH wasn't really targeting them this year and think they came quite late after herb application in spring barley.