Problems are being reported in a number of recently sown brassica catch crops. Some crops appear to have germinated, but areas within the crop are subsequently failing to grow, or even dying. In some instances almost the whole crop has failed in the late establishment phase.

In most reports to date, these problems are occurring in spring barley. The plants began to show symptoms as the first or second pair of true leaves appeared. This is the stage at which plants begin to take up nutrients from the soil, as all growth before that is fuelled from the seed reserves.