Abstract
Abstract The spotted alfalfa aphid (Therioaphis trifolii (Monell) forma maculata) produced sexual oviparous females at a day/night 10/14 h photophase in laboratory experiments. Only a small percentage of adults had this ability, and their fecundity was low. In the field a few sexual forms which produced only non-viable eggs were found in autumn. The minimum threshold temperatures for development were determined as 10.5 and 9.8°C in 1983 and 1984 respectively (higher than reported elsewhere). Hence, in New Zealand, spotted alfalfa aphid development rates are expected to be severely limited by the temperate climate.
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