Table 2.

Average closure of the branch pruning wounds from Shigo or conventional cuts during four growing seasons, 1987-1990.

	Shigo cut				Conventional cut
Cultivar^{* *}	Closure of branch pruning wounds (mm)
	’87	’88	’89	’90	’8 7	’88	’89	’90
Platanus	-0.5	11.2	13.1	11.3	4.6	19.2^*	21.9^*	15.5
Liquidambar	2.9	8.6	13.8	14.7	7.1 ^*	13.1 ^*	21.5^*	18.3
Acer (1)	1.9	7.3	10.5	10.1	8.4^*	13.1 ^*	15.6^*	13.0
Acer (2)	4.5	7.4	11.0	10.6	11.6^*	8.9	13.7	15.5^*
Acer (3)	2.8	6.3	7.7	12.1	10.7^*	13.3^*	18.2^*	19.3
Acer (4)	5.0	7.0	10.6	9.3	8.9^*	8.7^*	10.2	10.7
Ulmus	7.1	13.5	12.9	6.0	14.5^*	14.4	12.0	6.2
Fraxinus	4.2	4.6	4.6	5.3	9.2	8.0	6.8	7.9
Quercus	0.4	4.6	18.6	24.8	-0.6	9.1	20.2	22.4
Gledltsia	2.4	7.5	9.5	10.9	9.5^*	10.8	11.5	10.8
Average	3.1	7.8	11.2	11.5	8.4	11.9	15.2	14.0

↵* Significantly greater closure than Shigo cuts at P = .05 as determined by Student’s t test using paired samples
↵* * See Table 1 for species or cultivar designation