The development and reproduction of different clones of the English grain aphid, Sitobion avenae and the bird-cherry aphid, Rhopalosiphum padi were compared to assess their relative fitness on high and low nitrogen content wheat plants under laboratory conditions.
The clones showed significant differences in both the intrinsic rate of increase (rm) and mean relative growth rate (MRGR) on high as well as on low nitrogen content plants. All R. padi clones had a higher intrinsic rate of increase and MRGR than S. avenae.
Experiments were also conducted to compare the mean fecundity of apterous and alate morphs of S. avenae and R. padi clones on high and low nitrogen content wheat plants. On high nitrogen plants apterous morphs showed significantly higher mean fecundity than alate morphs. There were no significant differences between mean fecundity of alate morphs on high and low nitrogen content plants.
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