أعرض تسجيلة المادة بشكل مبسط
| dc.date |
2006-11-01T21:01:51Z |
|
| dc.date |
2006-11-01T21:01:51Z |
|
| dc.date |
1973 |
|
| dc.date.accessioned |
2013-10-16T07:41:21Z |
|
| dc.date.available |
2013-10-16T07:41:21Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3283 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3283 |
|
| dc.description |
The western spruce budworm, Choristoneura occidentalis (Free.), has
caused a measurable impact on a portion of the Flathead Indian Reservation
during a 5-year infestation period. This survey showed that
most of the grand fir and alpine fir, and 13.8 percent of the Douglas fir
has been top killed in the Valley Creek area west of Arlee, Montana.
The survey also disclosed that a total net growth loss of 19.6± 1.9 board
feet per acre per year has occurred since 1967. Significant growth
reduction at the 99 percent level occurred in Douglas-fir, grand fir,
alpine fir, and western larch. Little mortality in trees 5 inches d.b.h.
and greater has occurred to date. Of the trees under 5 inches d.b.h.
55.6 percent were not suitable for Christmas tree production because
of insect damage. |
|
| dc.language |
en_US |
|
| dc.publisher |
Missoula, Mont. : USDA, Forest Service, Northern Region, Division of State and Private Forestry |
|
| dc.relation |
Report (United States. Forest Service. Northern Region) |
|
| dc.relation |
no. 73-17 |
|
| dc.relation |
Insect and disease report |
|
| dc.title |
Observations on the impact of western spruce budworm on the Valley Creek Drainage, Flathead Indian Reservation, Montana |
|
| dc.type |
Technical Report |
|
الملفات في هذه المادة
|
لا توجد أي ملفات مرتبطة بهذه المادة.
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هذه المادة تبدو في المجموعات التالية:
أعرض تسجيلة المادة بشكل مبسط