| dc.date |
2006-10-26T13:35:10Z |
|
| dc.date |
2006-10-26T13:35:10Z |
|
| dc.date |
1972 |
|
| dc.date.accessioned |
2013-10-16T07:41:10Z |
|
| dc.date.available |
2013-10-16T07:41:10Z |
|
| dc.date.issued |
2013-10-16 |
|
| dc.identifier |
http://hdl.handle.net/1957/3228 |
|
| dc.identifier.uri |
http://koha.mediu.edu.my:8181/xmlui/handle/1957/3228 |
|
| dc.description |
Epidemic levels of the pine butterfly, Neophasia menapia (Felder and
Felder) have been evident in ponderosa pine stands in the Bitter Root
Valley since 1969. Evaluations of this infestation were initiated in
1970 to assess overwintering egg populations at 20 locations within
the infestation (Ciesla et al. 1971). Defoliation was estimated
following the feeding period in 1971 and a linear regression model was
computed using defoliation as the dependent variable and egg density as
the independent variable (Bousfield and Ciesla 1971). The purpose of
this study was to provide a basis for predicting future population
levels.
The objective of this evaluation is to test the prediction model,
forecast 1972 defoliation potential, and to obtain additional biological
information on the infestation. |
|
| 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. 72-9 |
|
| dc.relation |
Insect disease report |
|
| dc.title |
Potential for defoliation of ponderosa pine stands by pine butterfly on the Bitterroot and Lolo National Forests, Montana in 1972 |
|
| dc.type |
Technical Report |
|