. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 34° FUNGOUS DISEASES OF PLANTS very pronounced shot-hole effect. Varieties of Primus americana are frequently free from this fungus. Where a species or variety is subject to shot-hole diseases a shot- hole effect may also be produced upon the leaves by spraying with any substance injurious to the leaf. When the leaves are so severely injured that the spots coa- lesce, the large irregular pieces may fall out in the same manner as just indicated. In any case the effects of shot-hole
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 34° FUNGOUS DISEASES OF PLANTS very pronounced shot-hole effect. Varieties of Primus americana are frequently free from this fungus. Where a species or variety is subject to shot-hole diseases a shot- hole effect may also be produced upon the leaves by spraying with any substance injurious to the leaf. When the leaves are so severely injured that the spots coa- lesce, the large irregular pieces may fall out in the same manner as just indicated. In any case the effects of shot-hole troubles on the leaf are frequently very severe, so that practically complete defoliation of the trees may take place by midsummer. The fungus. In many cases the development of the acervuli of the fungus is not evident before the diseased areas have fallen away, but varieties in which the injured areas are persistent exhibit the fruiting pustules in great quantity. In such cases the spores may be seen to issue from the acervulus in tendril-like masses which are quickly spread out over the surface by dew and other agencies, appearing at first as a pale or ashen coating, becoming darker after a few days. The conidiophoric layer is often extensive and closely beset with the minute conidio- phores (Fig. 164). The spores are curved and measure ordinarily Fig. 163. Culture of Cylindrospo- RWM PaDI. 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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