. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. Figure 1.—Stromatal development and conidial production of Dothistroma septospora. A: Stromata developing under epidermis. B: Stromata appearing on the surface of the lesion by slitting epidermis. C: Stroma producing condidia (c). D: Stroma which has turned black and dried. E: Conidial masses (cm) produced on a stroma. F: Conidia. (Scales: A, B, C, D, E = 100 (im, F = 10 (im) As shown in table 1, conidia were first detected on stromat
. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. Figure 1.—Stromatal development and conidial production of Dothistroma septospora. A: Stromata developing under epidermis. B: Stromata appearing on the surface of the lesion by slitting epidermis. C: Stroma producing condidia (c). D: Stroma which has turned black and dried. E: Conidial masses (cm) produced on a stroma. F: Conidia. (Scales: A, B, C, D, E = 100 (im, F = 10 (im) As shown in table 1, conidia were first detected on stromata on 2 April 1983, and on 21 April 1984. A large number of conidia was produced from late May to early July 1983, and from early June to early July 1984 (fig. 1C, E, F). Stromata then turned black and dried, and almost no conidia were detected after early August 1983, and after mid-August 1984 (fig. ID). In May and June, 1985, which was the peak period of conidial production, conidia were produced per stroma. The perfect state of the fungus, Mycosphaerella pini E. Rostrup apud Munk, was not found at all during the experiments. As shown in figure 2, the 10-day average temperature was 13 and 14 C at the time of initial conidial production, 20-22 C and 22-25 C at the time of the highest production in 1983 and 1984, respectively, and 28 C at the time of final production in both years. There was rain throughout the period of conidial production, and rainfall at 10-day intervals during the period was 6-181 and 0-199 mm in 46. 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 Merrill, William; Ostry, Michael E; United States. Forest Service; International Union of Forestry Research Organizations. Working Party on Foliage Diseases. Washington, D. C. : U. S. Dept. of Agriculture, Forest Service
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