Effects of mating and oviposition delay on parasitism rate and sex allocation behaviour of Diaeretiella rapae (Hymenoptera: Aphidiidae)

2013 ◽  
Vol 65 (2) ◽  
pp. 265-270 ◽  
Author(s):  
Rashmi Kant ◽  
Maria Minor ◽  
Manoharie Sandanayaka ◽  
Steve Trewick
Keyword(s):  
Sex Allocation ◽  
Diaeretiella Rapae ◽  
Parasitism Rate

scholarly journals Parasitism rate of Myzus persicae (Sulzer) by Diaeretiella rapae (McIntosh) in the presence of an alternative, resistant host

2018 ◽  
Vol 62 (1) ◽  
pp. 13-18 ◽  
Author(s):  
Samira Evangelista Ferreira ◽  
Marcus Vinicius Sampaio ◽  
Reinaldo Silva de Oliveira ◽  
Heraldo Luís de Vasconcelos
Keyword(s):  
Myzus Persicae ◽  
Diaeretiella Rapae ◽  
Parasitism Rate

scholarly journals Effects of host and foundress density on reproductive strategy of Diaeretiella rapae

2012 ◽  
Vol 65 ◽  
pp. 294-294 ◽  
Author(s):  
R. Kant ◽  
M.A. Minor ◽  
S.A. Trewick ◽  
W.R.M. Sandanayaka
Keyword(s):  
Sex Ratio ◽  
Reproductive Strategy ◽  
Sex Allocation ◽  
Parasitic Wasp ◽  
Female Offspring ◽  
Reproductive Fitness ◽  
Brevicoryne Brassicae ◽  
Diaeretiella Rapae ◽  
Progeny Production ◽  
Total Parasitism

The reproductive fitness of a parasitoid depends on the oviposition decisions of a female in response to competition The present study investigated the oviposition and sex ratio of offspring produced by the parasitic wasp Diaeretiella rapae while competing with other conspecific females and at different host densities The number of Brevicoryne brassicae nymphs parasitised by female D rapae increased with the number of nymphs offered to them However the proportion of nymphs parasitised by the female decreased when nymph density was high The proportion of fertilised eggs oviposited by females decreased when nymph density increased An increase in the number of foundresses (females ovpositing together) increased the total parasitism but the contribution of each female (the number of nymphs each female parasitised) decreased Smaller proportions of female offspring were produced when females were competing for the same hosts The results of this study suggest that both host and foundress densities asymmetrically affect progeny production and sex allocation in this species

scholarly journals Parasitism and mating of Diaeretiella rapae (Hymenoptera Aphidiidae) in an uncontrolled environment

2010 ◽  
Vol 63 ◽  
pp. 283-283
Author(s):  
R. Kant ◽  
M.A. Minor ◽  
S.A. Trewick ◽  
W.R.M. Sandanayaka
Keyword(s):  
Sex Ratio ◽  
Environmental Conditions ◽  
Early Spring ◽  
Late Spring ◽  
Diaeretiella Rapae ◽  
Parasitism Rate ◽  
The Mean ◽  
Significant Change ◽  
Aphid Host

Parasitism and mating activities of Diaeretiella rapae were studied in a shadehouse under ambient environmental conditions during September (early spring) and November (late spring) Before collecting the data the parasitoid and its aphid host colonies were left to develop undisturbed on cabbage seedlings for 3 months in about 25 m2 area The plants were highly infested with aphids (average 27225 aphids/plant) and parasitism by D rapae varied between 25 and 36 during the study period There was no significant change in parasitism rate during the 10week study period (P069) Adult parasitoids emerged from aphid mummies at a rate of more than 90 with a higher number of females than males The mean female/male parasitoid sex ratio was greater in the second 5week (late spring) than the early 5week period (early spring) (P

Male biased sex allocation with plant size in gynomonoecious Aster ageratoides

2013 ◽  
Vol 20 (3) ◽  
pp. 386-390
Author(s):  
Ge Xingyue ◽  
Zhu Biru ◽  
Liao Wanjin
Keyword(s):  
Sex Allocation ◽  
Plant Size
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