Cabbage Maggot (delia Radicum) As A Potential Rapeseed (brassica Napus L.) Pest In The Czech Republic. Can We Make Use Of The German Experience?

摘要

Cabbage maggot (Delia radicum) belongs to one of the most significant pests of Brassicaceae vegetables (especially cauliflower) in the Czech Republic. Nowadays, it is also presented as a potentially major pest of rapeseed {Brassica napus L.). This work provides a historical overview of the cabbage maggot's occurrences on Brassicaceae vegetables in the Czech Republic territory up to the year 2005. In addition, it offers a prognosis of this pest's prospective spread. Based on the German experience, it can be assumed that the high concentration of rapeseed will cause a considerable spread of the cabbage maggot, and consequently, it will lead to an increase in the economic injury. Therefore, Czech growers are faced with another serious problem -there are no pesticides registered for the rapeseed usage to protect rapeseed plants against the cabbage maggot. However, the possibility of using rapeseed-registered pesticides against this crop's other pests is one of the solutions at hand. Moreover, other countries' observations may be successfully employed in an effort to solve this problem. In these countries, the damage caused by the cabbage maggot has been reduced by modification of the growing technology-