Converse of object

• stop: We had to carry through a mass picket there in order to stop some blacklegs.

Modifies a noun

• labor: Although there was some blackleg labor, the strike seemed solid, especially in the North East.

• disease: This may have important ramifications for our understanding of the blackleg disease cycle.

Noun used with modifier

• potato: Dr. Jennie L Brierley, from the Scottish Crop Research Institute, whose interests include the epidemiology of potato blackleg.