. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 360 FUNGOUS DISEASES OF PLANTS. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 360 FUNGOUS DISEASES OF PLANTS. Fig. 178. Septoria Pyricola : Section of Pycnidium nutrient media, germ tubes being pushed out from either end or from the middle (Fig. 179). This fungus has been readily cultivated upon bean stems and pear twigs, and I have reported the growth as follows: Here the fungus grew slowly at first, producing after sev- eral weeks the pyc- nidia of the Septoria. After several trans- fers this fungus grows quite luxuriantly on bean pods or stems, as seen in fig- ure . . , producing the pycnidia in a short time, and the pycnidia are then not so definite in form but formed of a very loose stromatic mass. The sub- merged hyphae are dark in color, while the aerial growth is dense and white, except the stromatic mass inclosing the pycnidium. I have had cultures for eighteen months; and although they have been subjected to various climatic conditions, nothing of further interest has as yet come from them. In nature the fungus is being closely watched for other stages, but I can say nothing definite upon this point at present, although other fungi have been found on the old leaves. Fig. 179. Septoria Pyricola: Ger- _ , „, . , minating Spores Control. Ihis fungus has been readily controlled in the orchard by the use of standard Bor- deaux mixture applied as for pear scab. Where vigorous nursery stock would be produced, it is necessary to spray every season; but a single application, after the first flush of growth, is often 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956. Boston ; New York : Ginn
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