Examination of Douglas-fir clones for differences in susceptibility to damage by cone and seed insects

Authors

  • A. F. Hedlin Environment Canada Canadian Forestry Service Pacific Forest Research Centre Victoria, B.C.
  • D. S. Ruth Environment Canada Canadian Forestry Service Pacific Forest Research Centre Victoria, B.C.

Keywords:

Douglas-fir, cone insects, <i>Barbara colfaxiana</i>, <i>Contarinia oregonensis</i>, <i> Contarinia washingtonensis<i/>, <i>Megastigmus spermotrophus</i>

Abstract

In 1974 and 1976, Douglas-fir cones from 51 clones and 150 clones, respectively, were collected and determinations were made of the percentage of seed damaged by the cone insects <i>Barbara colfaxiana</i>, <i>Contarinia oregonensis</i>, <i>C. washingtonensis<i/> and <i>Megastigmus spermotrophus</i>. Although statistically significant differences in percentage of damaged seeds were detected among clones, these differences were not great enough to be of practical importance.

References

DeBarr, G.L., E.P. Merkel, C.H. O'Gwynn, and M.H. Zoerb, Jr. 1972. Differences in insect infestation in slash pine seed orchards due to phorate treatment and clonal variation. For. Sci. 18:56-64.

Merkel, E.P., A.E. Squillace, and G.W. Bengston. 1965. Evidence of inherent resistance to Dioryctria infestation in slash pine. Proc. 8th South. Conf. For. Tree Improvement. pp 96-99, Savannah, Ga.

Snyder, E.G. 1972. Glossary for forest tree improvement workers. South. For. Expt. Sta. Forest Service, USDA, New Orleans, La.

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Published

2019-08-28

Issue

Vol. 75 (1978): Journal of the Entomological Society of British Columbia

Section

Articles

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