BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 45 
endangered by Ribes plants that have developed subsequently from 
seeds or sprouts. Such areas may require one or two reworkings, 
and these are timed at periodic intervals so as to remove the Ribes 
before they are able to produce seed. This practice prevents serious 
damage to'the pines, keeps the Ribes suppressed, and gradually works 
toward their permanent elimination from control areas. The details 
of the Ribes eradication work are given in table 6. 
Table 6. — Ribes eradication work during the calendar year 1939 
Region 
Initial 
eradication 
Reeradi- 
cation 
Total ini- 
tial eradi- 
cation and 
reeradica- 
tion i 
Effective 
labor 
Ribes 
destroyed 
Southern Appalachian States - 
North Central States 
Western white pine States (Idaho, Montana, 
Washington) 
Sugar pine States (California and Oregon) . 
Rocky Mountain States (Colorado and Wy- 
Acres 
340. 736 
359, 132 
292, 613 
36, 090 
128. 541 
Acres 
359, 405 
131.974 
73, 406 
68, 776 
72, 530 
Acres 
700. 141 
491, 106 
366, 019 
104, 866 
201, 071 
^fan-days 
159, 891 
34, 218 
83. 292 
158, 304 
135, 119 
Number 
13, 541, 085 
3, 230, 851 
17, 823, 644 
28, 376, 882 
19, 339, 389 
Total 
1. 157. 112 
706. 091 
1.863. 203 
570. 824 
82,311, 851 
i Includes work of cooperating Federal, State, and local agencies. 
Of the 570,824 man-days of employment provided, 290,637 man- 
days represent relief labor. 204,202 C. C. C. labor, and 75,985 the 
labor of cooperating State and local agencies. The number of indi- 
viduals employed during the season totaled 15,280. of whom 6,589 
were obtained from relief rolls, 6,015 from the C. C. C, and 2.676 
from the Department and its cooperating State and local agencies. 
Of the acreage reported above, 1,313,485 acres were worked by 
eradication crews paid from allotments of emergency-relief funds 
to the Bureau and to the Forest Service. The C. C. C. enrollees 
covered 374,820 acres, and the remaining 174,898 acres were worked 
by temporary employees of the Department and other cooperating 
agencies. Numerous States and townships provided appropriations 
for cooperation in control work on pinelands within their borders, the 
most substantial of such appropriations being those of New 7 York 
and Idaho. 
Where the work is in remote forest areas, it is necessary to subsist 
the men in camps. There were 83 such camps operated during 
the season, of which 45 contained relief laborers and 38 contained 
temporary employees of the Department and cooperating agencies. 
In addition. C. C. C. labor was assigned from 178 camps. The work 
of the C. C. C. on the National forests was performed by enrollees 
from camps assigned to the Forest Service of this Department. The 
work on the national parks and Indian reservations was carried on 
by labor from C. C. C. camps allotted to the National Park Service 
and Office of Indian Affairs of the Department of the Interior. The 
C. C. C. work on private and State lands was performed in most cases 
by labor assigned from camps under the direction of State foresters 
and the Soil Conservation Service. 
