. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 164 Bulletin 395 Frequently in the latter case the spots anastomose. Since the lesions are very small, about one to two millimeters in diameter, the foliage is not injured to any extent by the anthracnose, although later in the season the affected leaves may become more or less ragged. It has been observed also that in some cases the spots drop out
. Annual report of the New York State College of Agriculture at Cornell University and the Agricultural Experiment Station. New York State College of Agriculture; Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 164 Bulletin 395 Frequently in the latter case the spots anastomose. Since the lesions are very small, about one to two millimeters in diameter, the foliage is not injured to any extent by the anthracnose, although later in the season the affected leaves may become more or less ragged. It has been observed also that in some cases the spots drop out and give the shothole effect characteristic of many leaf spots. The common leaf spot of the raspberry, which may be confused with anthracnose, is caused by a species of Septoria. The lesion differs from that of the anthracnose disease in being irregular in outline and pale brown in color, with minute pycnidia just visible to the eye. In the case of the Septoria disease a yellowing and dying of the leaves occurs. ETIOLOGY The anthracnose disease of the raspberry is caused by the fungous pathogene Plectodiscella veneia Burkliolder. MORPHOLOGY The mycelium of Plectodiscella veneta when mature is hyaline and com- posed of minute cells many of which are globose. In all stages the fungus. Fig. 15. AscocARP of plectodiscella veneta Longitudinal section through the ascocarp, showing various stages in the development of the ascospores. Outlined with camera lucida from prepared slide. The tissue is somewhat shrunken. X 850 is very local and forms a stroma in the epidermal and subepidennal cells of the host. This stroma is frequently subcuticular, but never has it been 274. 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 York State College of Agriculture; Cornell University. Agricultural Experiment Station. [Ithaca
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