. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. 6/19 6/26 7/11 7/24 1986 DATE 8/7 8/20 Figure 1.—The development of current season needle ne- crosis on branches in the top, middle and bottom portions of 10 Noble fir Christmas trees. 60 40 20 TOP OF TREE [ZD MIDDLE EH! BOTTOM m. i 6/19 6/26 7/11 7/24 1986 DATE 8/7 8/20 Figure 2.—The development of current season needle ne- crosis on branches in the top, middle and bottom portions of 10 Grand fir Christmas trees. In the plantings of
. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. 6/19 6/26 7/11 7/24 1986 DATE 8/7 8/20 Figure 1.—The development of current season needle ne- crosis on branches in the top, middle and bottom portions of 10 Noble fir Christmas trees. 60 40 20 TOP OF TREE [ZD MIDDLE EH! BOTTOM m. i 6/19 6/26 7/11 7/24 1986 DATE 8/7 8/20 Figure 2.—The development of current season needle ne- crosis on branches in the top, middle and bottom portions of 10 Grand fir Christmas trees. In the plantings of smaller Grand fir and noble fir examined in 1986, initial current season needle necrosis symptoms were observed on 9 June and symptom devel- opment occurred most rapidly during the next 4-week period. The incidence of trees with current season needle necrosis was slightly higher for the Grand fir and there were no differneces between the two Noble fir seed sources in the percentage of trees with symptomatic needles (fig. 3). T R E E S A F F E C T E D 100 80 60 40 - 20 GRAND FIR ? 053 NOBLE FIR I 440 NOBLE FIR r. 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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