Estimation of Thermal Thresholds and Age-Specific Life Table Parameters for the Walnut Aphid (Homoptera: Aphididae) Under Field Conditions

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Abstract
Methods arc presented for estimating upper and lower thermal thresholds for walnut aphid development from field data. Age-specific life table techniques are also applied to field data to examine the effects of favorable and unfavorable temperatures on life table parameters. High-temperature extremes were found to delay development, shorten adult longevity, and reduce fecundity. As a consequence, the net reproductive rate and intrinsic rate of increase were reduced and the population doubling time lengthened as compared with life table parameters measured under more favorable temperature conditions.

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