Table 3.— Comparisons of herbicide treatments by mean numbers of ectomycorrhizal short roots (cm) on 10-cm 

 segments of main lateral seedling root, based on 30 samples for each treatment 



Nursery 



Treatment 







Mount Sopris 









Lucky Peak 





Ponderosa pine 



Lodgepole pine 



Engelmann spruce 



Ponderosa pine 



Lodgepole pine 



X 







X 







X 



a 



X 







X 







Control (no herbicide) 



37.6 



7.1 



35.7 



6.5 



48.7 



8.9 



35.5 



6.3 



36.1 



7.1 



Bifenox 























Bif. 1x1, + PG3 



37.0a^ 



9.8 



34.9a 



6.5 



5 



— 



38.6a 



5.8 



43.1a"6 



8.4 



Bif. 1 X. PS 



31.4a 



7.3 



33.0a 



6.8 



— 



— 



38.6a 



8.6 



39.6a 



7.0 



Bif. 1 X, PG 



35.2a 



9.9 



36.3a 



5.9 



— 



— 



39.0a 



4.8 



41.6a" 



8.9 



Bif. 2x, PS 



38.0a 



7.7 



35.1a 



7.0 



— 



— 



33.5a 



6.7 



41.2a" 



7.4 



Bif. 2x. PG 



oo.ya 



y.y 



Q-l OK * 7 



0.0 







0"7 C -^ 



o/.ba 



b.y 



40. ya 



y.1 



DCPA 























DCPA 1 X. PS - PG 



— 



— 



— 



— 



— 



— 



35.6a 



6.3 



43.8a" 



7.2 



DCPA 1 X, PS 



— 



— 



— 



— 



— 



— 



37.7a 



6.5 



38.2b 



5.8 



DCPA 1 X. PG 







— 











— 



— 



38.2a 



6.1 



38.3b 



7.8 



DCPA 2x. PS 















38.8a 



9.1 



41.0b" 



9.7 



DCPA 2x, PG 















37,6a 



8.1 



44.8a" 



8.5 



IMaoroDamide 























Nap. 1 X , PS -:- PG 



35.2a 



9.9 



35.4a 



7.5 



43.3a 



6.9 











Nap. 1 X . PS 



33.7a 



8.1 



37.4a 



9.3 



43.6a 



9.0 











Nap. 1 X, PG 



37.0a 



7.6 



35.7a 



7.2 



45.6a 



11.4 











Nap. 2x, PS 



37.5a 



12.4 



33.1b 



7.3 



45.2a 



8.2 











Nap. 2x. PG 



34.2a 



6.5 



34.3a 



6.4 



46.1a 



9.4 











M X = applied concentration according to manufacturer's recommendation. 2x = double concentration, for actual concentration of 

 active ingredient (see table 1). 

 2PS = immediately postseeding. 



2PG = postgermination. usually 4 to 5 v^eeks after seedling emergence. 



■"Treatments within a single herbicide group and species (down column) that do not share a common subscript letter are signifi- 

 cantly different to at least o = 0.05 level. Duncan's multiple range test. 

 ^Dash indicates this combination not tested. 



^" = treatment differs from appropriate control (head of column) to at least a = 0.01 level. Duncan's multiple range test. 

 = treatment differs from appropriate control (head of column) to at least o = 0.05 level. Duncan's multiple range test. 



4 



