Roberts, B.R. and A.M. Townsend. 1975. What roles do trees play in cleansing the air? Weeds, Trees and Turf 14(7):38-39.
One detrimental side-effect of the increasing energy demand in this country is the possibility of higher levels of air pollution. With more and more industries converting to coal as an alternative source of energy, the concentration of certain atmospheric pollutants, particularly sulfur dioxide (SO2), will increase proportionately. Thus, despite our efforts now and in the future, a certain degree of air pollution is inevitable. The problem then becomes one of maintaining pollution at some acceptable level. This can be accomplished in two ways: (1) by controlling the source of pollution through proper legislation and surveillance; and (2) by maintaining an adequate and effective reservoir for existing pollutants.
Furniss, M.M. and W.F. Barr. 1975. Insects affecting important native shrubs of the northwestern United States. Forest Service General Technical Report INT-19. Intermountain Forest and Range Experiment Station, Ogden, Utah. 64p.
Information is presented on insects and mites associated with important shrubs native to the Pacific Northwest. Forty-three insect species or insect groups and one mite species are discussed with emphasis placed on their geographic range, hosts, type of damage, appearance and habits, life cycle, and natural control. The orders of insects and mites represented are Coleoptera (beetles), Diptera (flies), Hemiptera (true bugs), Hymenoptera (ants), Lepidoptera (moths and butterflies), Thysanoptera (thrips), and Acarina (mites). A host plant index to the following genera is provided: Acer, Alnus, Amelanchier, Arctostaphylos, Artemisia, Atriplex, Betula, Ceanothus, Cercocarpus, Chrysothamnus, Populus, Prunus, Purshia tridentata, Quercus, Ribes, Rosa, Salix, Sambucus, Symphoricarpus, Ulmus.
- © 1976, International Society of Arboriculture. All rights reserved.
