Breny, R. 1957. Contribution à l'étude de la diapause chez Neodiprion sertifer Geoffr. dans la nature. Mem. Acad. R. Belg. Cl. Sci. 30: 1–86.
Brygider, W. 1952. In what embryonic stage do eggs of Neodiprion enter the winter diapause? Canad. J. Zool. 30: 99–108.
Chapman, L. J. 1953. The climate of northern Ontario. Canad. J. agric. Sci. 33: 41–73.
Chino, H. 1957. Conversion of glycogen to sorbitol and glycerol in the diapause egg of the Bombyx silkworm. Nature 180: 606–607.
Eckel, O., and Thams, C.. 1939. Unters. u. Dichte, Temp. u. Strahlverhaltn d. schneedecke in Davos. Geologie Schweiz, Hydrologic Lief. 3: 275–340.
Forsius, R. 1920. Kleinere Beitrage zur Kenntnis der Tenthredinoiden — Eier I. Medd. Soc. Fauna Fl. fenn. 45: 169–184.
Geiger, R. 1950. The climate near the ground. Harvard Univ. Press, Cambridge, Mass.
Green, G. W. 1962. Low winter temperatures and the European pine shoot moth, Rhyacionia buoliana (Schiff.) in Ontario. Canad. Ent. 94: 314–336.
Griffiths, K. J. 1959. Observations on the European pine sawfly, Neodiprion sertifer (Geoff.), and its parasites in southern Ontario. Canad. Ent. 95: 501–512.
Hamilton, C. C. 1943. The pine sawfly Neodiprion sertifer Geoff. and its control with concentrated lead arsenate sprays. J. econ. Ent. 36: 236–240.
Hart, G., and Lull, H. W., 1963. Some relationships among air, snow, and soil temperatures and soil frost. U.S. For. Ser. Res. Note, Ntheast. For. Exp. Sta. No. Ne-3: 4 pp.
Lyons, L. A., and Griffiths, K. J.. 1962. Observations on the development of Neodiprion sertifer (Geoff.) within the cocoon (Hymenoptera: Diprionidae). Canad. Ent. 94: 994–1001.
Mail, G. A. 1935. Cold weather and its effects on injurious insects. Montana St. Coll. agric. Exp. Sta. Cir. 146.
MacPhee, A. W. 1961. Mortality of winter eggs of the European red mite Panonychus ulmi (Koch), at low temperatures, and its ecological significance. Canad. J. Zool. 39: 229–243.
Putnam, D. F., and Chapman, L. J.. 1938. The climate of southern Ontario. Sci. Agric. 18: 401–446.
Salt, R. W. 1950. Time as a factor in the freezing of undercooled insects. Canad. J. Res., D, 28: 285–291.
Salt, R. W. 1953. The influence of food on the cold-hardiness of insects. Canad. Ent. 85: 261–269.
Salt, R. W. 1956. Influence of moisture content and temperature on cold-hardiness of hibernating insects. Canad. J. Zool. 34: 283–294.
Salt, R. W. 1957. Natural occurrence of glycerol in insects and its relation to their ability to survive freezing. Canad. Ent. 89: 491–494.
Salt, R. W. 1959. Role of glycerol in the cold-hardening of Bracon cephi (Gahan). Canad. J. Zool. 37: 59–69.
Salt, R. W. 1961a. Principles of insect cold-hardiness. Ann. Rev. Ent. 6: 55–74.
Salt, R. W. 1961b. Resistance of poikilothermic animals to cold. Brit. med. Bull. 17: 5–8.
Schaffner, J. V. 1939. Neodiprion sertifer (Geoff.), a pine sawfly accidentally introduced into New Jersey from Europe. J. econ. Ent. 32: 887–888.
Somme, L. 1964. Effects of glycerol on cold-hardiness in insects. Canad. J. Zool. 42: 87–101.
Sullivan, C. R., and Green, G. W.. 1964. Freezing-point determination in immature stages of insects. Canad. Ent. 96: 158.
Wallace, D. R., and Sullivan, C. R.. 1963. Laboratory and field investigations of the effect of temperature on the development of Neodiprion sertifer (Geoff.) in the cocoon. Canad. Ent. 95: 1051–1066.
Wyatt, G. R., and Kalf, G. F.. 1958. Organic compounds of insect hemolymph. Proc. Xth int. Cong. Ent. 2: 333.