AN APPROACH TO MEASURING CHANGES IN THE REPRODUCTION OF SPRUCE BUDWORM (LEPIDOPTERA: TORTRICIDAE) FIELD POPULATIONS FROM SURVEY DATA

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Abstract
Survey counts of spruce budworm, Choristoneura fumiferana (Clem.), female pupae, and eggs recorded annually at about 1000 sample points in New Brunswick from 1960 to 1975 provided ratios of eggs to females (E/F ratios) which are a measure of apparent reproduction. The 10-fold variation in the ratios was inversely associated with the frequency of July storm tracks. A positive relationship between E/F ratios and changes in the area of the budworm infestation in the province was also shown.
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