1) Agricultural pest 2) Living like a knave 
In agriculture, roguing refers to the act of identifying and removing plants with undesirable characteristics from agricultural fields. Rogues are removed from the fields to preserve the quality of the crop being grown. That is, the plants being removed may be diseased, be of an unwanted variety, or undesirable for other reasons. For example, to e...
The removal of diseased plants from a crop in order to prevent the spread of the disease. 
Removal of diseased plants.