Volume 20, Number 1 - Spring 1987 (1987)
Peer-Review Articles
An Annotated List and New Species Descriptions of Collembola Found in the Project Elf Study Area of Michigan
Richard J. Snider and Frank J. Calandrino
Puddling by Female Florida Tiger Swallowtail Butterflies, Papillo Glaucus Australis (Lepidoptera: Papilionidae)
J. Mark Scriber
Appearance of Damage Symptoms and Reinfestation Rates for Christmas Trees Attacked by the Zimmerman Pine Moth, Dioryctria Zimmermani (Lepidoptera: Pyralidae)
James W. Yonker and Donald L. Schuder
Change in Nutritional Quality of Detached Aspen and Willow Foliage Used as Insect Food in the Laboratory
William E. Miller
A Study of the Biology of Rhopalosiphum Padi (Homoptera: Aphididae) in Winter Wheat in Northwestern Indiana
J. E. Araya, J. E. Foster, and S. E. Cambron
Economic Thresholds for Central European and North American Wheat Insects
Stanley G. Wellso and Theo Wetzel
An Improved Biotic Index of Organic Stream Pollution
William L. Hilsenhoff