Behavioral and ecological aspects of the field and developmental
biology of Apanteles yakutatensis (Ashm.), a primary larval parasite of
the alfalfa looper, Autographa californica (Speyer), were investigated
in 1980 and 1981. Populations of A. yakutatensis were found in commercial
peppermint, alfalfa and crimson clover fields involving two
areas (Willamette Valley,...
The influence of natural enemies and plant apparency in
determining the abundance of the cabbage aphid Brevicoryne brassicae L.
and the imported cabbageworm Pieris rapae L. was examined on collards
grown in a collard monoculture and in a collard-alfalfa biculture.
This design was used to examine the factors affecting collardherbivore...
An exotic pest of deciduous plants, Operophtera
brumata (L.), was discovered in Portland, Oregon in
1978. O. brumata, the winter moth, is native to
northern Africa and temperate Eurasia. Its range
extends from Scandanavia, Britain, and France to Japan.
It is also now well established on the North American
continent...
The known biology of Bareogonalos canadensis
(Harrington) is based on literature records of six
collections from three areas in the Pacific Northwest.
The objective of this study was to obtain fundamental
knowledge on the biology of B. canadensis, especially
its distribution, abundance, and host species, as well
as its potential...
Ecological relationships between D. coccinellae and its coccinellid hosts were examined in the Willamette Valley, Oregon, in 1982. The distribution and relative abundance of seven species of coccinellids from eight collecting sites were monitored to determine percent parasitism by D. coccinellae on a spatial and temporal basis. Host size and...
Fifteen species of Noctuidae (Lepidoptera) were collected in alfalfa and
peppermint in western Oregon. Seven of these species were hosts for the braconid
parasitoid Meteorus communis. The most frequently parasitized (percent) species were
Agrotis ipsilon (35.3), Dargida procincta (15.0), and Peridroma saucia (6.9). Other
species parasitized were Autographa californica (3.8)...
Douglas-fir, Pseudotsuga menziesii and white alder,
Alnus rhombifolia, species that are prevalent in the
Pacific Northwest, were fed to larvae of the gypsy moth,
Lymantria dispar L. Gypsy moth larvae from different
familial lines (egg masses) from a single geographic
population were evaluated on these hosts. The larvae
were fed...
The genus Ormyrus has a worldwide distribution and
comprises about sixty recognized species. The higher
taxonomic relationships of the genus are uncertain, as
evidenced by its placement in the families Ormyridae,
Pteromalidae, or Torymidae. Here, the genus is described
in detail and a preliminary catalog of the world species
is...
Hippodamia convergens Guerin-Meneville was selected for
rapid development through five generations at four constant
temperatures (18, 22, 26, and 30°C). Two levels of selection
were used: intense and moderate. Differences in developmental
rate, survivorship, live adult weight, aphid consumption,
adult longevity, and fecundity were measured for both groups
and an...
The effects of forest cutting on forested systems and the biotic components of those systems has been at the forefront of scientific research. The inventory and monitoring of biodiversity is one technique used for measuring the effects of forest management. Because bioinventory studies are expensive, indicator species are often sought...