- Fox, J. W., D. L. Wood, and C. S. Koehler. 1990. Distributional and abundance of engraver beetles (Scolytidae: Ips species) on monterey pines infected with pitch canker. Canadian Entomologist 122:1157-1166.
- Fox, J. W., D. L. Wood, C. S. Koehler, and S. T. O'Keefe. 1991. Engraver beetles (Scolytidae: Ips species) as vectors of the pitch canker fungus, Fusarium subglutinans. Canadian Entomologist 123:1355-1367.
- Hamilton, W. D., P. Svihra, and C. S. Koehler. 1988. Pine tree deaths by bark beetles . University of California, Cooperative Extension, Division of Agriculture and Natural Resources Leaflet 70692.
- Byers, J. A., P. Svihra, and C. S. Koehler. 1980. Attraction of elm bark beetles to cut limbs on elm . Journal of Arboriculture 6:245-246.
- Koehler, C. S. 1959a. Studies of the biology and economic importance of the clover root borer Hylastinus obscurus (Marsham). Unpublished dissertation, Cornell University, Ithaca, New York. 126 p.
- Koehler, C. S. 1959b. Studies of the biology and economic importance of the clover root borer Hylastinus obscurus (Marsham) . Dissertation Abstracts 19:2412.
- Koehler, C. S., K. D. Fezer, H. H. Neunzig, and G. G. Gyrisco. 1961. The economic importance of the clover root borer . Journal of Economic Entomology 54:631-635.
- Koehler, C. S., and G. G. Gyrisco. 1959a. Effect of root size and soil moisture on the number of clover root borers present in red clover roots . Journal of Economic Entomology 52:658-660.
- Koehler, C. S., and G. G. Gyrisco. 1959b. Studies of the vertical distribution of the clover root borer in roots of red clover in relation to progression of the season . Entomological Society of America, Annals 52:760-762.
- Koehler, C. S., G. G. Gyrisco, L. D. Newsom, and H. H. Schwardt. 1961. Biology and control of the clover root borer, Hylastinus obscurus (Marsham). Cornell University (New York) Agricultural Experiment Station, Memoir 376. 36 p.
- Koehler, C. S., P. Svihra, J. A. Byers, and G. W. Frankie. 1979. Behavior of the smaller European elm bark beetle in relation to transmission of the Dutch elm disease fungus in California. California Department of Food and Agriculture, Final Technical Report, Agreement No. 9552. 11 p.
- Koehler, C. S., D. L. Wood, and A. L. Scarlett. 1978. Bark beetles in California forest trees. University of California, Division of Agricultural Sciences, Leaflet 21034. 8 p.
- Koehler, W. 1951. Przyczyny powstawania i przebieg gradacji szkodliwych owadow lesnych [Causes and development of outbreaks of forest insect pests] . Prace, Instytut Badawczy Lesnictwa 74:1-47.
- Koehler, W. 1954. Kornik-szesciozebny jako szkodnik pierwotny . Roczniki Nauk Rolniczych i Lesnych 4:177-179.
- Koehler, W. 1958. Wystepowanie szkodliwych owadom w okresie powojennego dziesieciolecia [Occurrence of harmful insects (in Poland) in the post-war decade] . Sylwan 102:18-37.
- Koehler, W. 1968. Observations on antagonistic relationships between insects feeding under the bark, and some saprophytic and parasitic fungi [In Polish, Russian, English summaries]. Prace, Instytut Badawczy Lesnictwa No. 355/357:133-139.
- Koehler, W., and Z. Zdanowicz. 1955. O zabezpieczeniu niekorowanego surowca sosnowego na skladach tartacznych przed szkodliwymi owaami [On the protection of unbarked pine logs in timberyards from injurious insects]. Roczinki Nauk Rolniczych i Lesnych 4:19-59 [1954?] [erroneous, not found in place cited].
- Svihra, P., and C. S. Koehler. 1981. Attraction of flying Scolytus multistriatus to cut wood of three elm species in California . Environmental Entomology 10:565-566.
- Svihra, P., and C. S. Koehler. 1982. Attack and development of Scolytus multistriatus in small-diameter elm branches . Environmental Entomology 11:594-597.
- Barr, B. A., D. L. Hanson, and C. S. Koehler. 1978. Red turpentine beetle: a pest of pines. Division of Agricultural Sciences, University of California, Berkeley. Leaflet 21055. 4 p.
- Hamilton, W. D., P. Svthra, and C. S. Koehler. 1988. Pine tree deaths by bark beetles. University of California, Cooperative Extension, Division of Agriculture and Natural Resources Leaflet 7069. 2 p.
- Koehler, C. S., R. H. Hunt, D. Froehlich, and J. Geiger. 1988. Protecting trees when building on forested land. University of California, Division of Agriculture and Natural Resources, Cooperative Extension Leaflet 21348. 11 p.
- Koehler, C. S., J. J. McKelvey, W. L. Roelofs, H. H. Shorey, R. M. Silverstein, and D. L. Wood. 1977. Advancing toward operational behavior-modifying chemicals. Pages 395-400 in H. H. Shorey and J. J. McKelvey, Jr., Chemical control of insect behavior: theory and application. John Wiley & Sons, New York.
- Koehler, U. 1986. Problems of infesting standing trees by Blastophagus piniperda [In German, English summary] . Anzeiger fur Schadlingskunde Pflanzen- und Umweltschutz 59:145-147.
- McCain, A. H., C. S. Koehler, and S. A. Tjosvold. 1987. Pitch canker threatens California pines . California Agriculture 41:22-23.
- Fox, J., D. Wood, and C. Koehler. 1990. Distribution and abundance of engraver beetles (Scolytidae: Ips species) on Monterey pines infected with pitch canker . The Canadian Entomologist 122:1157-1166.
- Fox, J., D. Wood, C. Koehler, and S. O'Keefe. 1991. Engraver beetles (Scolytidae: Ips species) as vectors of the pitch canker fungus, Fusarium subglutinans . The Canadian Entomologist 123:1355-1367.
- Koehler, C. 1990. Red turpentine beetle (RTB) control on pines. Growing Points (University of California Cooperative Extension, San Rafael, CA.) 27:2.
- Krausse-Opatz, B., U. Koehler, and R. Schopf. 1995. The energetic state of Ips typographus L (Col, Scolytidae) during the life cycle (In German). Journal of Applied Entomology 119:185-194.