The Collaborative International Dictionary of English v.0.48:
Quitch \Quitch\ (kw[i^]ch), n. 1. (Bot.) Same as Quitch grass. [1913 Webster] 2. Figuratively: A vice; a taint; an evil. [1913 Webster] To pick the vicious quitch Of blood and custom wholly out of him. --Tennyson. [1913 Webster]