Table 1.

Effectiveness of pruning infected elms in Evanston, Illinois.

Year pruned	Total public trees infected	No. trees pruned	No. trees surviving in fall of 1975	Percent pruned trees surviving
			Elms pruned on public property
1972	395	6	4	66
1973	321	11	7	64
1974	646	55	33	60
1975	235	2	2	100
Total		74	46	Avg. 62
	Total private trees infected	Elms pruned on private property
1972	370	17	2	12
1973	248	4	1	25
1974	495	8	5	63
1975	184	2	2	100
Total		31	10	Avg. 32