. Bulletin. Agriculture. Fig. 11.—Chlamydos- pores from a fruit 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. They become brown and are much enlarged sometimes attaining a diameter of one half inch (Fig. 7). In late stages of the disease numerous minute black elevations appear in the spots, caused by the develop- ment of p3'cnidia be- neath the epidermis. The pycnidia are some- times arranged in the form of a circle. They break through to the surface and set free numerous minute spores (Fi
. Bulletin. Agriculture. Fig. 11.—Chlamydos- pores from a fruit 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. They become brown and are much enlarged sometimes attaining a diameter of one half inch (Fig. 7). In late stages of the disease numerous minute black elevations appear in the spots, caused by the develop- ment of p3'cnidia be- neath the epidermis. The pycnidia are some- times arranged in the form of a circle. They break through to the surface and set free numerous minute spores (Fig. 10). Thick walled spores known as chlamydospores are common in the apple tissue and are probably impor- tant in carrying the disease over the winter (Fig. 11). Another spore that is found in the host tissue and is extremely common in cultures of the fungus is shown in Fig. 12. These spores are produced in indefinite numbers from knob-like projections on the side of the fungous threads (Fig. 13). Recent experiments^ have shown that the fungus causing the fruit spot of apples is also responsible for a similar spot on quinces known as "quince ; The dis- ease may spread from one host to the other. Treatment. The fungus does not attack the apples until thej' are nearly grown. Con- Fig. 12.—Spores of Phoma Pomi from a fruit 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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