During the First World War, the need to secure a domestic supply
of nitrate compounds necessary to the manufacture of explosives caused
the federal government to undertake an extensive program of research
and development of industrial nitrogen fixation processes. These
government activities were to have far-reaching consequences for the
development...
Riparian zones are critical habitats for management because of their importance
for both cattle production and wildlife, and a high potential for resource conflicts.
Riparian management should address habitat and microhabitat features that sustain both
livestock production and wildlife diversity. I conducted a study to determine how small
mammal distributions...
The objectives of this study were: 1) to learn the life history and habits of Medetera aldrichii Wheeler and a Lonchaea sp. in association with the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins, in western Oregon and Washington; 2) to determine if the larvae of M. aldrichii were predaceous on the Douglas-fir...
Six species of Cleridae, including Enoclerus spegeus Fabricius,
E. lecontei Wolcott, E. schaefferi (Barr), E. eximius Mannerheim,
Thanasimus undatulus Say, and an undescribed species of Enoclerus,
were found on Douglas-fir in western Oregon. E. sphegeus was the
only clerid of the six species studied which was primarily associated
with the...
The study involves the establishment, management, and behavioral
observations of Nomia melanderi Cockerell and Megachile rotundata
(Fabricius) in California, a survey of native bees within western Fresno
County, a determination of selfing and/or parthenocarpy in two fields of
alfalfa, and observations on the honeybee as an alfalfa pollinator.
The alkali...
The leaf- cutter bee Megachile rotundata (Fabricius) is an important
alfalfa pollinator in western North America.
This study was designed to provide information on methods of
orientation used by M. rotundata in order to make recommendations
regarding the parameters within which adult nesting populations may
be relocated.
Preliminary studies suggest...
Biological interrelationships between the ambrosia beetle
Xyleborus dispar (F.) (Coleoptera:Scolytidae) with its symbiotic
fungus, Ambrosiella hartigii Batra (Fungi Imperfecti) were investigated
in western Oregon.
Postdiapause adults of X. dispar collected in March through
June with rotary nets, and excised from overwintered and newly
attacked host material, produced a single generation...
The dynamics of a field population of the cinnabar moth, Tyria
jacobaeae L., were studied near Jordan, Linn County, Oregon. In
both 1970 and 1971 larval populations were so large that all foliage of
the host weed, tansy ragwort, Senecio jacobaea L., was consumed.
The ensuing starvation accounted for the...
