Replacing A Problem Prone Street Tree Saves Money; A Case Study Of The Tuliptree In Berkeley, California

Article Figures & Data

Table 1.

Maintenance vs. replacement, the twenty year costs of 400 University Avenue tuliptrees in Berkeley, California^*

Maintenance	Activity cost	Frequency	Total twenty year costs ($)
Activity	per tree ($)	per tree	Tuliptrees	Replacements
Trimming	213	2 times in 20 yrs.	170,400
(structural)		1 time in 20 yrs.		85,200
Trimming	32	2 times in 20 yrs	25,600
(clearance)		3 times in 20 yrs		38,400
Dead tree removal	100	1 tree in 100/yr.	8,000	8,000
Dead tree replacement	100	1 tree in 100/yr.	8,000	8,000
Watering (Jul-Sep)	0.60	Biweekly 1 st 3 yrs.	none	3,600
Trunk growth allowance	25	Once in 20 yrs.	10,000	none
Tuliptree removal	100	Once in 20 yrs.	none	40,000
Tuliptree replacement	100	Once in 20 yrs	none	40,000
SUBTOTAL			———	———
			222,000	223,200
Sidewalk damage repair	400	3/8 of trees in 20 yrs.	60,000	none
Pest management	9		72,000	none
SUBTOTAL			———	———
			132,000	none
TOTAL			———	———
			354,000	223,200

Table 2.

Twenty year costs for annual aphid honeydew management for 400 University Avenue tuliptrees in Berkeley, California.^*

Method	Annual cost per tree	Total 20 year cost for 400 tuliptrees
Sidewalk washing (weekly Jun-Sep.)	$38.40	$307,200
Canopy soap sprays (3 times/yr.)	24.00	192,000
Injection (once/yr.)	9.00	72,000
Chemical sprays (2 times/yr.)	12.00	96,000