Table 2.

Annual and total shoot growth (cm) for 3 years and total reduction expressed as a percentage of untreated controls of seven species of trees in Indiana untreated and treated in April 1996 with paclobutrazol using the soil injection method.

Treatment	Year			3-year total	Percentage reduction
Treatment	1996	1997	1998	3-year total	Percentage reduction
Black walnut
Central leader
Control	27.5 a	13.5 a	7.5 a	48.5 a
Treated	12.5 a	8.9 a	6.8 a	28.2 a	42
Lateral shoots
Control	10.0 a	10.5 a	8.2 a	28.7 a
Treated	7.0 a	5.6 a	4.8 a	17.4 a	39
Red oak
Central leader
Control	71.7 a	45.7 a	31.2 a	148.6 a
Treated	64.3 b	31.3 b	28.1 a	123.7 a	17
Lateral shoots
Control	55.4 a	23.4 a	21.5 a	100.3 a
Treated	40.1 b	17.5 a	16.2 a	73.8 a	26
Sweetgum
Central leader
Control	51.5 a	54.7 a	67.0 a	173.2 a
Treated	0.8 b	0.3 b	0.3 b	1.4 b	99
Lateral shoots
Control	34.0 a	27.7 a	21.7 a	83.4 a
Treated	0.7 b	0.3 b	0.2 b	1.2 b	99
White ash
Central leader
Control	44.8 a	37.5 a	37.5 a	119.8 a
Treated	31.3 b	26.3 b	35.0 a	92.6 a	23
Lateral shoots
Control	31.0 a	20.5 a	15.2 a	66.7 a
Treated	24.0 a	17.5 a	13.9 a	55.4 a	17
White oak
Central leader
Control	37.3 a	32.0 a	28.7 a	98.0 a
Treated	18.2 b	13.7 b	20.7 a	52.6 b	46
Lateral shoots
Control	41.7 a	28.7 a	32.8 a	103.2 a
Treated	14.7 b	10.0 b	10.2 b	34.9 b	66
White pine
Central leader
Control	95.3 a	82.3 a	89.8 a	267.4 a
Treated	84.0 b	48.0 b	55.7 b	187.7 b	30
Lateral shoots
Control	55.4 a	46.5 a	37.2 a	139.1 a
Treated	50.0 a	34.7 b	28.6 b	113.3 b	19
Yellow poplar
Central leader
Control	53.7 a	43.0 a	63.3 a	160.0 a
Treated	37.0 b	44.1 a	59.5 a	140.6 a	12
Lateral shoots
Control	32.3 a	28.3 a	24.7 a	85.3 a
Treated	21.8 b	22.4 a	18.6 a	62.8 a	26

Pairs of values followed by the same lowercase letter are not significantly different at the P ≤ 0.05 level.