Effect of Diatomaceous earth, malathion, dimethoate and permethrin on Leptoglossus occidentalis (Hemiptera: Coreidae): A pest of conifer seed. 1987. Summers, D.; Ruth, D.S. Journal of the Entomological Society of British Columbia 84: 33-38.
Experience with insecticides for control of cone and seed insects in Douglas-fir seed orchards in British Columbia. 1986. Summers, D.; Miller, G.E. Pages 267-283 in A. Roques, editor. Proceedings of the 2nd conference of the Cone and Seed Insects Working Party S2.07.01, September 3-5, 1986, Olivet, France. INRA-CRF Station de Zoologie Forestière, Ardon, France.
Inland spruce cone rust (Chrysomyxa pirolata) control: relation of ferbam application to Basidiospore production, rainfall, and cone phenology. 1986. Summers, D.; Sutherland, J.R.; Woods, T.A.D. Canadian Journal of Forest Research 16: 360-362.