5. Cognizance principles to plant quarantine objects Cognizance principles are consistent, but plant quarantine objects can be different in various countries or areas. 1)Disaster pests; 2)Transfer by human activity; 3)Distributed in a limited area home or abroad.5. Cognizance principles to plant quarantine objects Cognizance principles are consistent, but plant quarantine objects can be different in various countries or areas. 1) Disaster pests; 2) Transfer by human activity; 3) Distributed in a limited area home or abroad