. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 192 FUNGOUS DISEASES OF PLANTS On blighted branches of the peach the mycelium has been found (Smith) to grow most abundantly in the cambium and soft bast, these tissues disappearing in large measure with the forma- tion of extensive gum pockets (Fig. 71). The conidiophores arise as short hyphae, which soon become septate at the extremities, branched and nodulose. The branching proceeds in an indefinite and usually irregular or semidichotomous fashion (Fig. 72, a and b). From the ap
. Fungous diseases of plants : with chapters on physiology, culture methods and technique . Fungi in agriculture. 192 FUNGOUS DISEASES OF PLANTS On blighted branches of the peach the mycelium has been found (Smith) to grow most abundantly in the cambium and soft bast, these tissues disappearing in large measure with the forma- tion of extensive gum pockets (Fig. 71). The conidiophores arise as short hyphae, which soon become septate at the extremities, branched and nodulose. The branching proceeds in an indefinite and usually irregular or semidichotomous fashion (Fig. 72, a and b). From the apex of these branches toward the base conidia are rapidly cut off, these cells remaining for a time simply moniliform or as branched chains, each con- striction between the nodulations eventually marking the line of. flg. 72. sclerotwia fructigena : conidiophores and conidia, Section of Apothecium, Ascus, and Ascospores separation between adjacent spores. The spores germinate readily, and often while still massed in the tuft of conidiophores, that is, before being blown or brushed away. Germination studies, have shown that many of the conidia may live through until the suc- ceeding season, and, as indicated, the mycelium is even more capable of effective hibernation. Ordinarily no apothecial stage has been observed to intervene regularly in the life cycle of this fungus, and the ascosporous or Sclerotinia stage is not believed to be important to continue the propagation of the fungus. During the spring of 1902 the Scle- rotinia stage was found (Norton) quite commonly in the orchards of Maryland. The apothecia were discovered arising from scle- rotia, which might be developed either within the tissues or on. 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
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