Individual Variation in Sex Pheromone Component Ratios in Two Populations of the Redbanded Leafroller Moth, Argyrotaenia velutinana1

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Abstract
Gas chromatographic analyses of pheromone component ratios from 381 individual female tip extracts from field and laboratory populations of redbanded leafroller moths revealed that a narrow-variance signal (coefficient of variance = 9.7%) was used by both populations. Although all measured ratios of ( E )-/( Z )-11-tetradecenyl acetates for both populations fell within 4–15% for the E -component, the untransformed means and standard deviations for the field and lab insects were 9.1±1.8 and 7.0±1.4%, respectively (difference significant at P<0.01). The field Insects contained an average of 139±81 ng of pheromone/female compared to 107±58 ng/female for the laboratory insects. No significant relationships were found between insect body weights, quantity of pheromone, or component ratios.