Relationships between catches in flight and emergence traps of the mountain pine beetle, Dendroctonus ponderosae Hopk. (Col.: Scolytidae)

Daily emergence of the mountain pine beetle from lodgepole pine trees was monitored in the field by using caged bolts and by counting emergence holes on standing trees. Flying mountain pine beetles, pine engraver beetles and Pityogenes plagiatus knechteli (Swaine) were captured daily in two types of barrier traps. Daily totals of emergence holes and emergence into cages were moderately correlated with daily captures by both types of barrier traps. A simple model of daily emergence was developed based on estimates of brood density, daily proportions of brood adults, and daily proportions of brood adults ready to emerge. Daily catches of pine engravers and P. plagiatus knechteli were highly intercorrelated, but correlations with catches of mountain pine beetle were low for both species. The results are discussed in relation to beetle emergence and flight behaviour

Patterns of landing of spruce beetles, Dendroctonus rufipennis (Coleoptera: Scolytidae), on baited lethal trap trees

The distribution of spruce beetles (Dendroctonus rufipennis [Kirby]) landing on lethal trap trees was studied in each of 2 years. A wire basket and sticky boards on each tree were used to trap beetles. Significantly more beetles landed on the north side of the boles than on the other three aspects. The density of beetles that landed increased sharply to about 1.6-2.4 m above ground and then decreased. A three- parameter empirical model was used to describe the relationship. On average, about 4 of all the beetles that landed did so below the maximum height of insecticide treatment (4 m). The proportion of beetles from the lower 4 m of the bole that were trapped in the wire baskets ranged from 11% to 57% and averaged 33%. High correlations between numbers of beetles trapped in wire baskets at the paired trap trees each year, and between beetles trapped in wire baskets and on corresponding sticky boards showed that catches in the baskets were good indicators of the total numbers of beetles that landed on trap trees.Relative heat accumulation in the stand in degree-hours above a base temperature of 13.3°C during the day was a good indicator of the relative numbers of beetles that landed on the sticky boards. On typical days, beetles began to land on trap trees in midmorning: landings peaked between 1500 hours and 1600 hours and ceased by 2000 hours

Mortality of spruce beetle broods in bolts submerged in water

Six weeks of continuous submersion in water of spruce bolts containing larvae and young adults of the spruce beetle resulted in complete mortality. We estimated that 22 days of continuous submersion would be required to kill 50% of the brood. Brood development ceased in the submerged bolts even though water temperature, which increased from 13.3°C to 17.8°C during the experiments, was well above the larval development threshold (6.1°C)

Wheat potential yield trials 1980

80C34, 80TS9, 80BA4, 80WH8, 80KA7, 80N20, 80E41

Team Spirit: How Three Libraries Are Working to Support Health Sciences Libraries in Liberia

This poster presentation is a collaborative effort of librarians from Lamar Soutter Library, University of Massachusetts Medical School; Himmelfarb Health Sciences Library, The George Washington University; and Louis Stokes Health Sciences Library, Howard University. International medicine initiatives often occur through institution specific efforts. Yet information needs extend across borders and institutions. Three American health sciences libraries have united to support the development of health sciences libraries in Liberia. While separate schools will support undergraduate and graduate medical education initiatives, the libraries are working together to bring current information resources to all health care professionals

Field techniques for rearing and marking mountain pine beetle for use in dispersal studies

Mountain pine beetles, Dendroctonus ponderosae, were marked with fluorescent (DayGlo) powders in vacuum chambers and on powder-covered brood trees in the field for use in release-recapture studies of dispersal behaviour. A large wall tent was used as a field insectary to accelerate late stages of development of large numbers of beetles in naturally infested bolts of lodgepole pine. Up to 28% of the marked beetles which flew were recovered from lethal trap trees. Beetles self-marked on powdered brood trees were captured in barrier traps in predicted proportions