Canadian Forest Service Publications
Temperature treatment of Douglas-fir seeds to control the seed chalcid Megastigmus spermotrophus Wachtl. 1974. Ruth, D.S.; Hedlin, A.F. Canadian Journal of Forest Research 4(4): 441-445.
Issued by: Pacific Forestry Centre
Catalog ID: 29110
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Larvae of the chalcid Megastigmusspermotrophus in Douglas-fir seeds were killed when treated at 45 °C for 27 h (2-year-old seed) and for 33 h (1-year-old seed). Heat treatment of uninfested seed did not affect rate of germination of seedling growth.