The objectives undertaken in this study were:
1) to develop means of identifying the immature stages of
the known insect predators and parasites of the Douglas-fir beetle; 2) to investigate the possible distribution,
spatially and/or temporal, of the known insect predators
and parasites in standing trees infested by the Douglas-fir...
The study was undertaken to determine the seasonal and diurnal
flight patterns of scolytid beetles inhabiting a second growth
forest of Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) in western
Oregon. Air temperatures, relative humidity, light intensity, and wind
velocities were recorded for evaluation of their influence on flight activity.
The insects were...
The flight behavior of Ips confusus (Lec.) was primarily
studied under field conditions, but augmented with
complementary laboratory studies whenever feasible. The
experiments were mostly conducted in areas of endemic population
levels, but also under epidemic and prairie conditions.
The techniques and devices used in marking, releasing,
attracting, and trapping...