Table 1.

Area (mm²) of 1-, 2- and 3-year-old bark wounds in eight tree species treated and untreated with 9.6 g PBZ by soil injection.

Species	Treatment	Initial area	1 year later	2 years later	3 years later
White oak	Treated	314.2	142.5 a^*	77.5 a	9.8 a
(Quercus alba)	Control	314.2	43.3 b	3.9 b	0.0 b
Red oak	Treated	314.2	136.3 a	39.0 a	4.7 a
(Q. rubra)	Control	314.2	78.2 b	3.1 b	0.0 a
Sweetgum	Treated	314.2	84.9 a	65.5 a	58.3 a
(Liquidambar styraciflua)	Control	314.2	24.1 b	0.0 b	0.0 b
Black walnut	Treated	314.2	119.0 a	81.0 a	57.5 a
(Juglans nigra)	Control	314.2	57.2 b	23.6 b	7.4 b
European black alder	Treated	314.2	140.1 a	115.3 a	13.7 a
(Alnus glutinosa)	Control	314.2	127.8 a	11.6 b	0.0 a
Yellow poplar	Treated	314.2	25.8 a	0.0 a	0.0 a
(Liriodendron tulipifera)	Control	314.2	68.0 a	15.6 a	1.2 a
White ash	Treated	314.2	20.7 a	1.0 a	0.0 a
(Fraxinus americana)	Control	314.2	20.2 a	0.6 a	0.0 a
White pine	Treated	314.2	30.6 a	12.6 a	11.2 a
(Pinus strobus)	Control	314.2	25.5 a	0.0 a	0.0 a

↵* Pair values followed by the same lowercase letter are not significantly different at the P ≤ 0.05 level (Tukey’s Studentized Range Test).