It was introduced into Africa for this purpose , but it has spread rapidly and is now a serious pest in southern Africa , where it is known as rooikrans ( in Afrikaans , `` red garland '' ) .
It was introduced into Africa for this purpose , but it has spread fast and is now a serious pest in South Africa , where it is known as ` rooikrans ' ( = ` red garland ' in Afrikaans ) .