. Annual report, 1954. Forests and forestry Southern States Periodicals; Forests and forestry Research Southern States Periodicals. Table 18. - -Oxidation-reduction measurements in a healthy and a "die-out" loblolly plantation (In millivolts) Depth of : Oxidation-reduction measurements , made in soil : Fall : Winter : Spring samples : Healthy Diseased ? Healthv Diseased * Healthv • T~)i ^pacjpH (Inches) : stand stand : stand stand : stand : stand 0- 218 91 140 -1 79 31 194 96 103 38 71 38 165 82 86 36 60 38 135 90 78 19 59 28 115 58 72 18 44 18 30-3
. Annual report, 1954. Forests and forestry Southern States Periodicals; Forests and forestry Research Southern States Periodicals. Table 18. - -Oxidation-reduction measurements in a healthy and a "die-out" loblolly plantation (In millivolts) Depth of : Oxidation-reduction measurements , made in soil : Fall : Winter : Spring samples : Healthy Diseased ? Healthv Diseased * Healthv • T~)i ^pacjpH (Inches) : stand stand : stand stand : stand : stand 0- 218 91 140 -1 79 31 194 96 103 38 71 38 165 82 86 36 60 38 135 90 78 19 59 28 115 58 72 18 44 18 116 52 68 2 35 9 10. SOIL IN HEALTHY STANDS SOIL IN DISEASED STANDS Sapstreak Disease of Sugar Maple and Yellow-poplar During the past 15 years, 198 sugar maple and 144 yellow-poplar trees have been inoculated with Endoconidiophora virescens. Only 15 trees, two of them yellow-poplars, have become diseased following inoculation. Strains of the fungus isolated from sap- streak-diseased maples have killed maples, and from blue-stained yellow- poplar lumber have infected yellow- poplars. Thus, although successful infection appears to be uncommon, both in nature and artificially, the ordinary blue-stain Endoconidiophora appears to be able to act as a quick killer of large trees once it succeeds in invading the vascular system. A 13-acre plot of 78 large sugar maples in an area where sapstreak has been common was put under observation in 1941. So far, eight have died and two more are diseased. The disease has thus far been identified only on sugar maple near Barnardsville, North Carolina, and on yellow-poplar near AshevLlle, North Carolina, and Damascus, Tennessee. Figure recession from filled wells, in two hours. - 68 -. 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 Southeastern Forest Experime
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