NORTHERN SPY • FREE TRANSLATOR.ORG • Definition of Northern Spy

... troublesome disease of the apple is the apple-scab, which disfigures the fruit as well as lessens its size. It also often does much harm to the foliage, and thus checks the growth of the trees (Fig. 214). The Baldwin, Fameuse, Northern Spy and Red Canada are particularly subject to this disease, and it is much more troublesome in moist seasons than when the weather is dry. The use of fungicides will do much to lessen the injury from ...

— Manual of Gardening (Second Edition) • L. H. Bailey