| dc.date |
2006-11-13T15:19:42Z |
|
| dc.date |
2006-11-13T15:19:42Z |
|
| dc.date |
1976 |
|
| dc.date.accessioned |
2013-10-16T07:41:53Z |
|
| dc.date.available |
2013-10-16T07:41:53Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3366 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3366 |
|
| dc.description |
Aerial surveys of six Montana National Forests in 1975 found
a 22.1% increase in the area of visible defoliation caused
by the western spruce budworm. It is estimated that 2,278,804
acres of Douglas-fir forests are now suffering at least 25%
defoliation. This is an increase of 503,706 acres over the
1,775,098 acres defoliated in 1974. Egg mass surveys were
made in infested areas to predict the degree of defoliation
in 1976. Based on this survey, the following mean percent
defoliation is predicted for each National Forest: Deerlodge,
56%; Helena, 57%; Gallatin, 29%; Beaverhead, 37%; Flathead, 5%;
Lolo, 24%. |
|
| dc.language |
en_US |
|
| dc.publisher |
Missoula, MT. : Forest Environmental Protection, USDA, Forest Service, Northern Region, State & Private Forestry |
|
| dc.relation |
Report (United States. Forest Service. Northern Region) |
|
| dc.relation |
no. 76-4 |
|
| dc.relation |
Forest environmental protection |
|
| dc.title |
Potential for defoliation by western spruce budworm in Douglas-fir stands in Montana, 1976 |
|
| dc.type |
Technical Report |
|