The survival and performance of the bluegreen lucerne aphid (Acyrthosiphon kondoiShinji (Homoptera#x2236; Aphididae)) on lucerne(Medicago sativaL.) cultivars #x2018;Saranac#x2018;, #x2018;Wairau#x2018;, and #x2018;Washoe#x2018;, were compared at six constant temperatures from 6.4 to 30#xB0;C and under fluctuating temperatures in an insectary. A comparison between progeny of alate and apterous maternal morphs showed no significant differences in survival and performance. However, maternal influence induced significantly more alate production from progeny of apterae compared with progeny of alatae at 11.5 and 17.0#xB0;C and in the insectary. Optimum temperature for development was estimated to be 19.5#xB0;C and survival declined from 100 at 11.5#xB0;C to 36 over the 24#x2013;day period of the experiment. Some cultivar differences were apparent at moderate temperatures (17.0 and 20.5#xB0;C), with colonies on #x2018;Wairau#x2018; having the highest population and growth rate (measured by number of cast skins produced). #x2018;Washoe#x2018; showed the most inhibition of A.kondoigrowth and development.
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