The parasitoid Praon volucre (Hymenoptera: Braconidae: Aphidiinae) as a potential biological control agent of the aphid Uroleucon ambrosiae (Hemiptera: Aphididae) on lettuce in Brazil
2008
De Conti, B.F.,Universidade Federal de Lavras (Brazil). Departamento de Entomologia | Bueno, V.H.P.,Universidade Federal de Lavras (Brazil). Departamento de Entomologia | Sampaio, M.V.,Universidade Federal de Uberlandia (Brazil)
This work evaluates the aphid Uroleucon ambrosiae as a host for the parasitoid Praon volucre on lettuce. As Macrosiphum euphorbiae is a common host of P. volucre in the field, the development of the parasitoid was compared on these two aphid species. Twenty nymphs of the 2nd instar were kept with P. volucre for one hour at 22+/-1 deg C, 70+/-10% RH and a 12 h photophase. The size of the aphid's tibiae at the moment of oviposition indicated that there was no significant size difference between U. ambrosiae and M. euphorbiae. When mummies were formed, M. euphorbiae had significantly longer tibia (1.5+/-0.03 mm) than U. ambrosiae (1.4+/-0.02 mm). No significant differences were detected in the percentage emergence, proportion of female offspring, development time from oviposition to adult and longevity. High parasitism levels were recorded for both host aphid species, but the percentage parasitism of M. euphorbiae (54.4+/-4.40) was higher than of U. ambrosiae (35.6+/-5.30). Female parasitoids reared on M. euphorbiae had longer tibiae (0.78+/-0.01 mm) than those reared on U. ambrosiae (0.72+/- 0.01 mm). Our results demonstrate that the alternative host species U. ambrosiae, compared to the natural host species M. euphorbiae, affects the female's size, but did not affect parasitoid development time, longevity, emergence or sex ratio. The parasitoid P. volucre seems to be a good candidate for using as a biological control agent of U. ambrosiae on lettuce in Brazil.
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