They occur only in cooler climates. Males are occasionally found and sexual reproduction may occur. The developmental rate, number of progeny, and adult longevity is greatly influences by temperature, host plant species and host plant age. At this temperature the birth rate is greatest on immature barley plants and lowest on senescent plants. El-Ibrashy et al.
Generations are continuous in Hawaii.
There are possibly as many as 50 generations per year. EGGS Most aphids in temperate regions overwinter in the egg stage. Since this species is a tropical species overwintering eggs have not been observed. There are four nymphal stages. The upper and lower development thresholds are 95 F and 50 F, respectively.