Insect economic levels in relation to crop production

El-Wakeil, Nabil

doi:10.1080/03235400902753584

Cited by 6 publications

(2 citation statements)

References 145 publications

(154 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Stable pest populations are preferable to those characterised by cycles of outbreak, particularly if damage caused by that pest is at an acceptable level, below the economic threshold (Cameron et al 2001;El-Wakeil 2010). By assessing the effect of host density on parasitism rate, we found evidence of both HDD and HDI aggregation of parasitoids at the scale of the leaf and at the scale of the field.…”

Section: Discussionmentioning

confidence: 78%

“…A stable pest population maintained at a low level by a specialist parasitoid may therefore be more desirable for successful biocontrol. Integrated pest management programs that tolerate a level of pest infestation below the economic threshold could help maintain environmental quality and reduce unnecessary management activities and costs (Cameron et al 2001;El-Wakeil 2010).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Density dependence and environmental factors affect population stability of an agricultural pest and its specialist parasitoid

et al. 2016

View full text Add to dashboard Cite

Host-parasitoid dynamics are intrinsically unstable unless the risk of parasitism is sufficiently heterogeneous among hosts. Spatial aggregation of parasitoids can contribute to this heterogeneity, stabilising host-parasitoid population dynamics and thereby reducing pest outbreaks. We examined the spatial distribution of mango gall fly (Procontarinia matteiana, Kiefer and Cecconi), a non-native pest of South African mango orchards, which is controlled by a single parasitoid (Chrysonotomyia pulcherrima, Kerrich). We assessed whether spatial aggregation of parasitoids is associated with proximity to natural vegetation and/or to host density-dependent and host density-independent factors at three spatial scales. We found evidence for higher parasitism rates near natural vegetation at the field scale, and inverse host-density dependent and density-independent parasitoid aggregation at both the leaf scale and field scale. Therefore, we conclude that natural vegetation plays a role in promoting stabilising aggregation of parasitoids, possibly through provision of non-host resources (nectar, pollen), in this system.

show abstract

Section: Discussionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%