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CHANGES IN SPRUCE BUDWORM DEFOLIATION WITH CROWN LEVEL
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AbstractDetailed estimates of defoliation caused by spruce budworm [Choristoneura fumiferana (Clem.)] over the crown length of young balsam fir [Abies balsamea (L.) Mill.] were made throughout a spruce budworm outbreak from 1976 to 1984 in the Cape Breton Highlands, Nova Scotia. The results show no clear tendency for a particular level of the crown to be damaged more heavily than any other. Thus, there is no reason to continue the common practice of taking samples from the mid-crown level on the assumption that they represent an ‘average’ level of defoliation either for high or low populations. Sampling from the bottom of the crown should provide a more convenient and cost-effective approach for estimating defoliation.
Title: CHANGES IN SPRUCE BUDWORM DEFOLIATION WITH CROWN LEVEL
Description:
AbstractDetailed estimates of defoliation caused by spruce budworm [Choristoneura fumiferana (Clem.
)] over the crown length of young balsam fir [Abies balsamea (L.
) Mill.
] were made throughout a spruce budworm outbreak from 1976 to 1984 in the Cape Breton Highlands, Nova Scotia.
The results show no clear tendency for a particular level of the crown to be damaged more heavily than any other.
Thus, there is no reason to continue the common practice of taking samples from the mid-crown level on the assumption that they represent an ‘average’ level of defoliation either for high or low populations.
Sampling from the bottom of the crown should provide a more convenient and cost-effective approach for estimating defoliation.
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