Pernicious root

Macbeth, [4.3.84-90]. Macduff. “This avarice/ Sticks deeper, grows with more pernicious root/ Than summer-seeming lust, and it hath been/ The sword of our slain kings. Yet do not fear;/ Scotland hath foisons to fill up your will/ Of your mere own. All these are portable,/ With other graces weigh’d.”