Summary
The effect of different synthetic diets of the hostMyzus persicae on the parasiteAphelinus asychis was tested. Deficient diets were prepared by reducing sucrose or iron concentration: sucrose concentration was reduced from 15% in the complete diet (D.I.) to 7.5% in D. II and 3.75% in D. III; that of iron from 0.0023% in D. I to 0.0011% in D. IV and 0% in D.V.
The development of the immature stages ofA. asychis in aphids fed on the deficient diets was delayed (especially on D. V). The size of the emerging adults was small, which corresponds with the reduced size of the host. The percentage of the male parasites was found to be higher on the deficient diets than on the full one. The lowest average longevity of the females was found among those reared on aphids on D. III and D.V.
If honeydew fromM. persicae was offered to the females, a marked reduction in the longevity of these parasites was observed on D. II and D. III. On the other hand, on honeydew from aphids on D. IV and D.V,A. asychis lived as long as on honeydew from those fed on D.I.
The fecundity of the females ofA. asychis was found to be dependent on the food composition of the hosts during larval development as well as during adult life.
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Zohdy, N.Z.M. On the effect of the food ofMyzus persicae Sulz. on the hymenopterous parasiteAphelinus asychis Walker. Oecologia 26, 185–191 (1976). https://doi.org/10.1007/BF00582896
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DOI: https://doi.org/10.1007/BF00582896