Natural enemy impacts on Bemisia tabaci (MEAM1) dominate plant quality effects in the cotton system

Peter Asiimwe, Peter C Ellsworth, Steven E. Naranjo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

1. Plant quality (bottom-up effects) and natural enemies (top-down effects) affect herbivore performance. Furthermore, plant quality can also influence the impact of natural enemies. 2. Lower plant quality through reduced irrigation increased the abundance of the cryptic species from the Bemisia tabaci complex [hereafter B. tabaci Middle East Asia Minor 1 (MEAM1)], but not its natural enemies on cotton. It was therefore predicted that lower plant quality would diminish the impact of natural enemies in regulating this herbivore. 3. Over three cotton seasons, plant quality was manipulated via differential irrigation and natural enemy abundance with insecticides. Life tables were used to evaluate the impact of these factors on mortality of immature B. tabaci (MEAM1) over nine generations. 4. Mortality of B. tabaci (MEAM1) was consistently affected by natural enemies but not by plant quality. This pattern was driven by high levels of sucking predation, which was the primary (key) factor associated with changes in immature mortality across all irrigation and natural enemy treatments. Dislodgement (chewing predation and weather) and parasitism contributed as key factors in some cases. Analyses also showed that elimination of sucking predation and dislodgement would have the greatest effect on overall mortality. 5. The top-down effects of natural enemies had dominant effects on populations of B. tabaci (MEAM1) relative to the bottom-up effects of plant quality. Effects were primarily due to native generalist arthropod predators and not more host-specific aphelinid parasitoids. The findings of this study demonstrate the important role of arthropod predators in population suppression and validate the importance of conservation biological control in this system for effective pest control.

Original languageEnglish (US)
Pages (from-to)642-652
Number of pages11
JournalEcological Entomology
Volume41
Issue number5
DOIs
StatePublished - Oct 1 2016

Fingerprint

Bemisia tabaci
Middle East
natural enemy
East Asia
natural enemies
cotton
mortality
predation
irrigation
arthropod
arthropods
herbivore
herbivores
immatures
predator
predators
life table
Asia
effect
life tables

Keywords

  • Arthropod predators
  • biological control
  • life tables
  • parasitoids
  • plant stress
  • whiteflies

ASJC Scopus subject areas

  • Ecology
  • Insect Science

Cite this

Natural enemy impacts on Bemisia tabaci (MEAM1) dominate plant quality effects in the cotton system. / Asiimwe, Peter; Ellsworth, Peter C; Naranjo, Steven E.

In: Ecological Entomology, Vol. 41, No. 5, 01.10.2016, p. 642-652.

Research output: Contribution to journalArticle

@article{728596baee3642e8a1d317687e4526e4,
title = "Natural enemy impacts on Bemisia tabaci (MEAM1) dominate plant quality effects in the cotton system",
abstract = "1. Plant quality (bottom-up effects) and natural enemies (top-down effects) affect herbivore performance. Furthermore, plant quality can also influence the impact of natural enemies. 2. Lower plant quality through reduced irrigation increased the abundance of the cryptic species from the Bemisia tabaci complex [hereafter B. tabaci Middle East Asia Minor 1 (MEAM1)], but not its natural enemies on cotton. It was therefore predicted that lower plant quality would diminish the impact of natural enemies in regulating this herbivore. 3. Over three cotton seasons, plant quality was manipulated via differential irrigation and natural enemy abundance with insecticides. Life tables were used to evaluate the impact of these factors on mortality of immature B. tabaci (MEAM1) over nine generations. 4. Mortality of B. tabaci (MEAM1) was consistently affected by natural enemies but not by plant quality. This pattern was driven by high levels of sucking predation, which was the primary (key) factor associated with changes in immature mortality across all irrigation and natural enemy treatments. Dislodgement (chewing predation and weather) and parasitism contributed as key factors in some cases. Analyses also showed that elimination of sucking predation and dislodgement would have the greatest effect on overall mortality. 5. The top-down effects of natural enemies had dominant effects on populations of B. tabaci (MEAM1) relative to the bottom-up effects of plant quality. Effects were primarily due to native generalist arthropod predators and not more host-specific aphelinid parasitoids. The findings of this study demonstrate the important role of arthropod predators in population suppression and validate the importance of conservation biological control in this system for effective pest control.",
keywords = "Arthropod predators, biological control, life tables, parasitoids, plant stress, whiteflies",
author = "Peter Asiimwe and Ellsworth, {Peter C} and Naranjo, {Steven E.}",
year = "2016",
month = "10",
day = "1",
doi = "10.1111/een.12340",
language = "English (US)",
volume = "41",
pages = "642--652",
journal = "Ecological Entomology",
issn = "0307-6946",
publisher = "Wiley-Blackwell",
number = "5",

}

TY - JOUR

T1 - Natural enemy impacts on Bemisia tabaci (MEAM1) dominate plant quality effects in the cotton system

AU - Asiimwe, Peter

AU - Ellsworth, Peter C

AU - Naranjo, Steven E.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - 1. Plant quality (bottom-up effects) and natural enemies (top-down effects) affect herbivore performance. Furthermore, plant quality can also influence the impact of natural enemies. 2. Lower plant quality through reduced irrigation increased the abundance of the cryptic species from the Bemisia tabaci complex [hereafter B. tabaci Middle East Asia Minor 1 (MEAM1)], but not its natural enemies on cotton. It was therefore predicted that lower plant quality would diminish the impact of natural enemies in regulating this herbivore. 3. Over three cotton seasons, plant quality was manipulated via differential irrigation and natural enemy abundance with insecticides. Life tables were used to evaluate the impact of these factors on mortality of immature B. tabaci (MEAM1) over nine generations. 4. Mortality of B. tabaci (MEAM1) was consistently affected by natural enemies but not by plant quality. This pattern was driven by high levels of sucking predation, which was the primary (key) factor associated with changes in immature mortality across all irrigation and natural enemy treatments. Dislodgement (chewing predation and weather) and parasitism contributed as key factors in some cases. Analyses also showed that elimination of sucking predation and dislodgement would have the greatest effect on overall mortality. 5. The top-down effects of natural enemies had dominant effects on populations of B. tabaci (MEAM1) relative to the bottom-up effects of plant quality. Effects were primarily due to native generalist arthropod predators and not more host-specific aphelinid parasitoids. The findings of this study demonstrate the important role of arthropod predators in population suppression and validate the importance of conservation biological control in this system for effective pest control.

AB - 1. Plant quality (bottom-up effects) and natural enemies (top-down effects) affect herbivore performance. Furthermore, plant quality can also influence the impact of natural enemies. 2. Lower plant quality through reduced irrigation increased the abundance of the cryptic species from the Bemisia tabaci complex [hereafter B. tabaci Middle East Asia Minor 1 (MEAM1)], but not its natural enemies on cotton. It was therefore predicted that lower plant quality would diminish the impact of natural enemies in regulating this herbivore. 3. Over three cotton seasons, plant quality was manipulated via differential irrigation and natural enemy abundance with insecticides. Life tables were used to evaluate the impact of these factors on mortality of immature B. tabaci (MEAM1) over nine generations. 4. Mortality of B. tabaci (MEAM1) was consistently affected by natural enemies but not by plant quality. This pattern was driven by high levels of sucking predation, which was the primary (key) factor associated with changes in immature mortality across all irrigation and natural enemy treatments. Dislodgement (chewing predation and weather) and parasitism contributed as key factors in some cases. Analyses also showed that elimination of sucking predation and dislodgement would have the greatest effect on overall mortality. 5. The top-down effects of natural enemies had dominant effects on populations of B. tabaci (MEAM1) relative to the bottom-up effects of plant quality. Effects were primarily due to native generalist arthropod predators and not more host-specific aphelinid parasitoids. The findings of this study demonstrate the important role of arthropod predators in population suppression and validate the importance of conservation biological control in this system for effective pest control.

KW - Arthropod predators

KW - biological control

KW - life tables

KW - parasitoids

KW - plant stress

KW - whiteflies

UR - http://www.scopus.com/inward/record.url?scp=84985945434&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84985945434&partnerID=8YFLogxK

U2 - 10.1111/een.12340

DO - 10.1111/een.12340

M3 - Article

AN - SCOPUS:84985945434

VL - 41

SP - 642

EP - 652

JO - Ecological Entomology

JF - Ecological Entomology

SN - 0307-6946

IS - 5

ER -