. Bulletin. Agriculture -- New Hampshire. Dec, 1909.] SOME APPLE DISEASES. 117. west as Michigan. It is not so destructive as the scab, but often causes otherwise perfect fruit to go as seconds. It is found on abnost every variety of apple, but the Bald\\'in is especially susceptible. The disease appears about the middle of August. At this time it may be seen as spots of a deeper red on the col- ored surface of the apple and of a darker green on the lighter portion. As the sea- son advances, the spots be- come more prominent. They usually become slightly sunken, and on the red surface the colo
. Bulletin. Agriculture -- New Hampshire. Dec, 1909.] SOME APPLE DISEASES. 117. west as Michigan. It is not so destructive as the scab, but often causes otherwise perfect fruit to go as seconds. It is found on abnost every variety of apple, but the Bald\\'in is especially susceptible. The disease appears about the middle of August. At this time it may be seen as spots of a deeper red on the col- ored surface of the apple and of a darker green on the lighter portion. As the sea- son advances, the spots be- come more prominent. They usually become slightly sunken, and on the red surface the color often changes to brown or black (Fig. 7). The tissue be- neath the spot is rendered brown and corky to a depth of several cells (Fig. 8). Cold storage seems to check the development of the spots, but in cellar storage they often become more sunken and spread deeper into the tissue of the apple. [Microscopical studies have shown that a particular fungus is always present in these spots. The fungus in question has been found to be a species of Cylindrospo- rium. In the early stages of the diseases it has made but scant development, but later it forms a firm fungus mass, from the upper surface of which sporophores and spores are produced (Fig. 9). The spores are long, thread-like and from one to five celled (Fig. 10). Fig. 8.— thru a fruit spot. The corky cells beneath the epidermis are shown above, while below are seen the brown and withered cells produced in the later devel- opment of the spot. The fungus can be seen in the pocket in the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New Hampshire Agricultural Experiment Station. [Hanover, N. H. ] : New Hampshire Agricultural Experiment Station
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