Spruce Budworm Defoliation in Relation to Introgression in Red and Black Spruce
Goal(s)/Objective(s): Rating branch samples for severity of budworm damage to 1968 foliage, using 10 defoliation categories ranging from rating one for no defoliation to rating ten for complete defoliation.
Key Findings: Post-cutting regeneration techniques would favor the less shade-tolerant black spruce.
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- Manley, S.A.M.
- Fowler, D.P.
During a genecological study of the red-black spruce complex in central New Brunswick, it appeared that severity of spruce budworm defoliation was related to the genotype of the individual trees. The closer an individual tree approximated red spruce, the greater the severity of budworm defoliation. The relationship was tested by rating foliage samples, obtained from red, black, and introgressed spruce, in respect to budworm defoliation. The correlation between budworm defoliation and genotype, as determined by a hybrid index system, was highly significant.
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