Infection can take place anywhere along the carrot root and lesions start as pinhead-size spots.
In most cases visible symptoms develop in the month before harvest maturity and develop rapidly if conditions are favourable. Cavity spot reduces the quality of carrots so that they become unacceptable for the local and export fresh markets. Cavity spot has resulted in severe losses and has been difficult to control. Control Cavity spot can be minimised by using an integrated control program based on tolerant varieties, rotation, liming, scheduling harvesting, and metalaxyl application. Grow carrots when cavity spot is least likely to occur.