. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. Table 1.—Effect of various treatments during shoot elon- gation on the incidence of current season needle necrosis on Noble fir Christmas trees Treatments1 Percent symptomatic needles2 Check Basal irrigation Antitranspirant (Folicote) Fungicide (Bravo 500) 53% shade cloth a a a a b 1 Treatments were applied to individual trees in each of 16 blocks. The soil beneath the trees receiving the irriga- tion treatment
. Recent research on foliage diseases : conference proceedings : Carlisle, Pennsylvania, May 29-June 2, 1989. Leaves Diseases and pests United States Congresses. Table 1.—Effect of various treatments during shoot elon- gation on the incidence of current season needle necrosis on Noble fir Christmas trees Treatments1 Percent symptomatic needles2 Check Basal irrigation Antitranspirant (Folicote) Fungicide (Bravo 500) 53% shade cloth a a a a b 1 Treatments were applied to individual trees in each of 16 blocks. The soil beneath the trees receiving the irriga- tion treatments was flooded on 24 May, 17 and 25 June, 7, 19, 24 and 29 July. Folicote (diluted 1:19 in water) and Bravo 500 at g were applied to trees on 24 May, 3, 17 and 27 June and the shade cloth was placed over the trees on 23 May 1985. 2 Data collected on 9 August 1985. Numbers followed by the same letter are not significantly different, P < , Duncan's mulitple range test. Discussion Although only a limited number of diseases and disor- ders have been reported on Noble fir (2,3,7,8), surveys of Noble fir Christmas tree plantations in western Washing- ton and Oregon indicate that current season needle necrosis is prevalent throughout the production areas examined. Approximately twice as many needles on the survey trees exhibited symptoms of this needle disorder in 1984 compared to 1983, indicating that there can be considerable variation in disease incidence from one year to another. Outside of the Pacific Northwest, this disor- der has been observed on Noble fir growing near. 0 1 5 CALCIUM CHLORIDE (MG/ML) Figure 4.—Relationship between increasing concentra- tions of calcium chloride and the percentage of Noble fir needles with current season needle necrosis during 1985 and 1986 tests (Y1 = - , r = , P<). Table 2.—Phytotoxicity associated with applications of calcium chloride to Noble fir Christmas trees during 1985 and 1986 Concentrat
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