EFFECTS OF LAMINATED ROOT-ROT (PHELLINUS-WEIRII) ON DOUGLAS-FIR FOLIAR CHEMISTRY

To determine the effects of laminated root rot (Phellinus weirii) on D ouglas-fir (Pseudotsuga menziesii (Mirb.) France) foliar chemistry, ch lorophyll a and b, N, P, K, Ca, Mg, Mn, Fe, and foliage moisture were measured in new and old foliage from 20- to 80-year-old coastal Dougla s-fir. Measurements were made in June and September of 1993 and June o f 1994. Chlorophyll a and b, Ca, Fe, Mg, and Mn were higher in old fol iage in both June and September, while moisture, N, and K were higher in the new foliage. The relationship of P to foliage age changed with time. Reductions in foliage moisture, chlorophyll a, and N were consis tently associated with P. weirii infection in all plots, but the norma l high variability in foliage chemistry made demonstration of statisti cal significance difficult. Within-tree variability in foliar chemistr y was much higher in June than in September, especially in the new fol iage.