Table 1.

Cumulative number of diseased elms, alive elms, and percentage Dutch elm disease incidence since initiation of study in Detroit, Michigan, 1974-1978.

Treatment19741974-751974-761974-771974-78
DEDAliveDEDAliveDEDAliveDEDAliveDEDAlive
Girdlingplus
 prompt removal
113
5.6%
1923184
9.1%
1845279
13.8%
1743358
17.7%
1664497
24.6%
1525
Promptremoval
 only
85
4.7%
1735155
8.6%
1656272
15.1%
1532377
20.9%
1427489
27.1%
1315
Methoxychlorspray
 plus conventional
116
6.4%
1700232
12.8%
1579430
23.8%
1380566
31.3%
1244714
39.4%
1096
Conventional
 removal
110
6.2%
1659208
11.8%
1554410
23.3%
1352556
31.5%
1206748
42.5%
1014