brassica

— The destruction of the roots of brassicae by the Cabbage Root Fly and the tunnels in carrots and onions caused by the larvae of the Carrot and Onion Flies respectively, usually followed by rotting of the affected plants, are very frequently observed, whereas in the past, measures for the control of these pests have been very inadequate. […] When visited on June 13 over 50 per cent. of the brassicae were attacked by cabbage root maggot and many had already been transplanted.