The presence of the carrot fly is a big threat for the growth of carrots. In spring the flies crawl from the soil and become active. The carrot fly still is one of the most common pests in the growth of carrots. By monitoring the population can be monitored and actions can be taken when necessary.
The carrot fly (psila rosae) can cause damage in many types of umbelliferous crops, such as celeriac, celery, parley and carrots. The carrot fly has two to three flight per year. The first flight is in May to June, the second flight is from the end of July until the beginning of September. The third flight takes place from September to November. The life cycle of the carrot fly has 6 stages. This life cycle has an egg stage, 3 larval stages, a pop stage and the imago. About 1 to 10 days after emerging to an adult the flies lay their eggs around the base of the crops. Three larval stages follow after hatching of the eggs. In the first stage the larvae attack the lateral roots, during the second phase the lateral roots and the taproot. The larvae in phase 3 feed themselves completely from the taproot after which the larvae emerge to an adult.