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Mean family attack at Red Rock (%) Mean family attack at Red Rock {%)
Figures 1 & 2.--Comparison of attack percentages at the Red Rock and Aleza Lake test sites and at the Red Rock and
Quesnel test sites.
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Mean 6-year heights at Red Rock (%) o 300 32
Mean 15-year heights at Red Rock (%)
Figures 3 & 4.--Relationship between average family height measurements at 6 and 15 years of age and mean family weevil
attacks at the Red Rock test site.
This latter finding was especially gratifying as a literature survey indicated that white pine weevil favored more
robust, longer leaders. While this still may be true at the phenotypic level, genetically superior families are less susceptible.
We would have accepted susceptibility that was equal to the mean; the fact that faster growing families are less susceptible is
a bonus.
Quesnel Lakes Progeny Trials
In the fall of t993 additional genetic test plantations were assessed for weevil attack. These plantations were
established in 1983 to evaluate the genetic potential of I42 parent trees. The tests were established on three sites (KetchuE_
Creek, Little Benson Lake, and Clearwater) using randomized complete blocks with eight blocks per site and four seedlings
per replication per family (total 32 seedlings per site per family for a grand total of 96 seedlings per family over the three
sites).
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