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Filtering by: Subject Forest insects -- Montana Degree Name Doctor of Philosophy (Ph.D.)

The biology of the balsam woolly aphid, Chermes piceae Ratz., in Oregon and Washington and the identification and evaluation of its native predators

Creator:

Mitchell, Russel Gene

Resource Type:

Dissertation

Full Text:

ACKNOWLEDGMENTS Acknowled~nts should first be made to the Pacific Northwest Forest and Range EXperiment
A biological and developmental study of Coeloides brunneri Vier. : a parasite of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopk.

Creator:

Ryan, Roger B.

Resource Type:

Dissertation

Full Text:

of this insect and of its natural eneries. Still, the study of' the complex interrelationships
Foraging ecology of pollinators in the early stages of secondary succession in the western hemlock (Tsuga heteropohylla (Raf.) Sarg.) zone of the Oregon Coast Range

Creator:

Burikam, Intawat

Abstract:

The early stages of secondary succession of the McDonald and Paul Dunn State Forests, Corvallis, Oregon, were grouped into three stages; herb, herb-shrub, and shrub, based on vegetation types. Flowers of herbaceous species and residual shrubs dominated in the early years after clear-cutting. Woody plants became increasing abundant in the...

Resource Type:

Dissertation

Full Text:

to early summer and late summer flowering peaks, respectively. Insect pollinators partitioned