. The Botrytis blight of tulips ... Botrytis; Tulips. The Botrytis Blight of Tulips 325 color changes to a whitish gray with a brownish tinge, and a translucent or water- soaked area appears about the margin. At this stage the margins of the lesions are quite definite (fig. 24). Toward the center abundant conidiophores are often pro- duced. Under favorable conditions the lesions enlarge still farther, coalesce, and frequently involve the entire leaf. If a lesion develops toward the base of a leaf, it may cause the leaf to break over. When an infec- tion takes place on the mar- gin of the leaf
. The Botrytis blight of tulips ... Botrytis; Tulips. The Botrytis Blight of Tulips 325 color changes to a whitish gray with a brownish tinge, and a translucent or water- soaked area appears about the margin. At this stage the margins of the lesions are quite definite (fig. 24). Toward the center abundant conidiophores are often pro- duced. Under favorable conditions the lesions enlarge still farther, coalesce, and frequently involve the entire leaf. If a lesion develops toward the base of a leaf, it may cause the leaf to break over. When an infec- tion takes place on the mar- gin of the leaf near the tip, there results the character- istic appearance shown in figure 26. This wrinkling and bending of Ihe leaf to one side is due to the more rapid growth of the healthy tissue opposite the lesion. (Klebahn, 1905:4). Both young and old lesions are found on the same leaf showing that infections take place continuously (fig. 25). The outer sheathing leaf is likely to be attacked before the others, probably being infected as it emerges from the bulb. It bends down- ward and usually is abun- dantly covered with conidio- phores (fig. 27).. 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 Hopkins, Edwin Fraser, 1891- [from old catalog]. [Ithaca]
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttulips, bookyear1921
