. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 179 the new growth. It was formerly supposed that this fungus was very largely propagated by a perennating mycelium, or by infec- tions resulting during the summer and persisting in the woody parts until the following season, but as will be shown later, infec- tions must generally occur as the buds unfold. The percentage resulting from a mycelium remaining alive in the hypertrophied twigs is very small. The badly affected twig dies and the my- celium with it. From other
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. ASCOMYCETES 179 the new growth. It was formerly supposed that this fungus was very largely propagated by a perennating mycelium, or by infec- tions resulting during the summer and persisting in the woody parts until the following season, but as will be shown later, infec- tions must generally occur as the buds unfold. The percentage resulting from a mycelium remaining alive in the hypertrophied twigs is very small. The badly affected twig dies and the my- celium with it. From other affected twigs diseased leaf buds are seldom produced (Fig. 65).. Fig. 65. One Healthy and Three Diseased Twigs of Peach; the Center Twigs recovered from the Attack Susceptibility of host varieties. There is a great difference in the susceptibility of different varieties under similar conditions. Moreover, a single variety may show a difference in resistance when grown under diverse environmental conditions. A list of the most susceptible varieties in New York would not correspond with a list for California. Among susceptible varieties in the far West have been included such as the following: Crawford's Early and Late, Elberta and Salway, Heath King and Hale's Early, Lovell, Old Mixon Free, etc.; while for Ohio, Mountain Rose, Old Mixon, Globe, Elberta, and others are among those most 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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