Constant and Fluctuating Temperature Effects on Developmental Rates and Life Table Statistics of the Greenbug (Homoptera: Aphididae)1

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Relationships between temperature and developmental rate, age-specific survival, and age-specific fecundity were determined for the greenbug, Schizaphis graminum (Rondani). Nymphal developmental rate was studied at six constant temperatures. The data provided estimates of lower and upper thresholds for nymphal development of 5.86°C and 28.33°C, respectively. Age-specific life table parameters were estimated from single cohorts subjected to fluctuating temperature regimes that approximated average and extreme low and high temperature conditions occurring during spring in eastern South Dakota. Life table statistics varied among temperature regimes when time was expressed in days, but converged when time was expressed in degree-days (DD). Stable instar distributions varied on a DD scale. The proportion of immatures increased and the proportion of adults decreased with increasing temperature. Estimates of the number of DD required for development from birth to adulthood were similar for individuals reared using constant and fluctuating temperatures. Thus, DD summations incorporating both upper and lower developmental thresholds appeared to be adequate for describing greenbug development under temperature conditions encountered in the field during the spring grain growing season in eastern South Dakota.

Document Type: Research Article

Publication date: April 1, 1988

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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