Table 1.

Average phytotoxlclty ratings based on foliar appearance of treated and untreated trees.^¹

Species	1984	1985	1986
Plane
treated	1.4^*	1.0	0.1
untreated	0.9	0.7	0.0
Red maple
treated	1.0	0.8	0.7
untreated	0.7	0.7	0.8
Norway maple
treated	0.4	0.2	0.2
untreated	0.3	0.2	0.1

↵Ratings based on June inspections of foliage (0 = no phytotoxicity).
↵* = significantly different from control (95% confidence level), standard errors approximately 0.1 for each group.