DESCRIPTION OF PLATES. 
Puate I. (Frontispiece.) The ‘‘rough-bark” disease on apple branches and leaves. 
Fig. 1.—A branch ofa Yellow Newtown tree, showing the earlier stages of the disease. 
Fig. 2.—A Yellow Newtown apple branch which shows the disease in its later 
stages. Fig. 3.—Apple leaves showing pycnidia of the fungus on areas which 
were first burned with a hot needle and then sprayed with spores. 
Puate II. Fig. 1.—Branches of Yellow Newtown apple trees, showing various stages 
of the ‘‘rough-bark” disease. Fig. 2—Yellow Newtown apple twigs, showing the 
‘“‘rough-bark”’ disease produced by artificial inoculation with spores of Phomopsis 
mali. Both the incipient sunken stage and the later roughened stage are shown. 
Prats III. Fig. 1.—York Imperial apple leaves inoculated with Phomopsis malt 
through areas which had previously been burned with a hot needle. The fungus 
is fruiting on the spots. Fig. 2.—Growth of Phomopsis mali on corn meal, showing 
ropelike masses of spores after 60 days. Fig. 3.—York Imperial apple, about one- 
third grown, showing rot produced by artificial inoculation with the fungus, which 
is fruiting on the decayed spots. Note the ring of pycnidia on the largest spot. 
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