Biology and control of sugar beet significant weeds:: Fool's parsley - Aethusa cynapium L.

Aetbusa cynapium is winter annual weed but can emerge during the whole vegetation period, especially in spring when appropriate moisture is available. It occurs as a weed in sugar beet and vegetable stands (carrot, parsley, onion). High efficacy on this species is shown by active ingrediences triflusulfuron and clopyralid that are uptaken by leaves. From the group of soil applied herbicides, only quinmerac can be used to control A. cynapium, but its efficacy is strongly influenced by soil moisture. Clopyralid is the only active ingredience effective enough to control this weed species in late growing stage.