Parasitoid- and hyperparasitoid-mediated seasonal dynamics of the cabbage aphid (Hemiptera: Aphididae)

Nematollahi, Mohammad Reza, Fathipour, Yaghoub, Talebi, Ali Asghar, Karimzadeh, Javd and Zalucki, Myron Philiip (2014) Parasitoid- and hyperparasitoid-mediated seasonal dynamics of the cabbage aphid (Hemiptera: Aphididae). Environmental Entomology, 43 6: 1542-1551. doi:10.1603/EN14155

Author Nematollahi, Mohammad Reza
Fathipour, Yaghoub
Talebi, Ali Asghar
Karimzadeh, Javd
Zalucki, Myron Philiip
Title Parasitoid- and hyperparasitoid-mediated seasonal dynamics of the cabbage aphid (Hemiptera: Aphididae)
Journal name Environmental Entomology   Check publisher's open access policy
ISSN 0046-225X
Publication date 2014-12-01
Year available 2014
Sub-type Article (original research)
DOI 10.1603/EN14155
Open Access Status
Volume 43
Issue 6
Start page 1542
End page 1551
Total pages 10
Place of publication Cary, NC United States
Publisher Oxford University Press
Collection year 2015
Language eng
Formatted abstract
The population dynamics of the cabbage aphid, Brevicoryne brassicae (L.), its parasitoid, Diaeretiella rapae McIntosh, and hyperparasitoids, Pachyneuron spp., were quantified under field conditions during 2011–2013, by examining synchronization, parasitoid: aphid ratio, possible effect of density on the finite rate of increase, and spatial coincidence. The rates of parasitism and hyperparasitism were based on rearing field-collected mummies and live parasitized aphids, and density of the aphid were estimated using heat extraction and subsampling techniques. Only one parasitoid, D. rapae (80% on average), and two hyperparasitoid species from the genus of Pachyneuron (6.5% on average), namely Pachyneuron aphidis (Bouché) and Pachyneuron groenlandicum (Holmgren), were reared from the aphid mummies. Significant Pearson's time lagged correlations for percentage parasitism versus aphid density and for percentage hyperparasitism versus mummy density indicated that 2–3 wk is needed for D. rapae and Pachyneuron spp. to show impact on their respective host's population. In early spring, the parasitoid: aphid ratio was low (0.11 on average) while aphid density was increasing. Based on Taylor's power law, D. rapae and Pachyneuron spp., as well as B. brassicae, had an aggregated distribution among canola plants. Moreover, a high degree of spatial overlap was found between D. rapae and B. brassicae and between Pachyneuron spp. and D. rapae. In general, the parasitoid had good spatial coincidence with its aphid host but because of a lack of parasitoid-host synchronization and low parasitoid: aphid ratio, impact on the host population was low.
Keyword Diaeretiella rapae
Brevicoryne brassicae
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
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