ABSTRACT
Spring ploughing did not reduce the numbers of carrot flies that emerged from fields infested with this pest. Water-traps were effective for monitoring fly activity in the field, though the most appropriate hue of yellow paint needs to be confirmed. The time of activity of the first generation was forecast accurately using the number of day-degrees accumulated above a base temperature of 6°C. Further work is required to produce a correspondingly accurate forecast for the second generation. Standard sampling methods are essential, if data collected by Group members are to be incorporated into any generalized model for forecasting carrot fly attacks.
