Details
| Original language | English |
|---|---|
| Pages (from-to) | 17-24 |
| Number of pages | 8 |
| Journal | Biological control |
| Volume | 30 |
| Issue number | 1 |
| Publication status | Published - 23 Oct 2003 |
Abstract
The life cycle of the western flower thrips (WFT), Frankliniella occidentalis Pergande (Thysanoptera: Thripidae), comprises an edaphic phase, which offers the opportunity to control this serious pest by the exploitation of soil-dwelling natural enemies. In the present study, the effect of the two soil-dwelling predatory mites, Hypoaspis miles (Berlese) and H. aculeifer (Canestrini) (Acari: Laelapidae), on the population development of the WFT feeding on French beans (Phaseolus vulgaris) was examined. The experiments were carried out in acrylglass tubes, which served as microcosms. The extent of the edaphic phase within a given population of synchronized WFT was investigated by the use of photo-eclectors (emergence traps). This method ensured (1) an easy determination of the proportion of a thrips population entering the soil for pupation and (2) the quantification of the efficiency of predatory mites on the thrips developmental stages in the soil. The results showed that 98% of the thrips population left the bean plant for pupation in the soil. The introduction of five predatory mites caused thrips mortality of at least 44.9%. Doubling the predator density to 10 H. miles increased thrips mortality to 61%. A maximum thrips mortality of 80.5% was attained by the introduction of 20 H. aculeifer. As a result, H. aculeifer showed a greater efficiency as a natural enemy against soil-dwelling developmental stages of the WFT. Both species can be important antagonists of the WFT in protected crops. Opportunities to enhance biocontrol efforts are discussed.
Keywords
- Acari, Biological control, Edaphic phase, Frankliniella occidentalis, Ground foraging, Hypoaspis aculeifer, Hypoaspis miles, Laelapidae, Microcosm, Phaseolus vulgaris, Predator efficiency, Predatory mite, Thripidae, Thysanoptera, Western flower thrips
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Insect Science
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In: Biological control, Vol. 30, No. 1, 23.10.2003, p. 17-24.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The edaphic phase in the ontogenesis of Frankliniella occidentalis and comparison of Hypoaspis miles and Plypoaspis aculeifer as predators of soil-dwelling thrips stages
AU - Berndt, Oliver
AU - Meyhöfer, Rainer
AU - Poehling, Hans Michael
N1 - Funding information: The German Science Foundation (Deutsche Forschungs Gemeinschaft) supported this research. We thank M. Langhof, M. Baalmann, and S. Schiele for technical help in rearing and maintaining cultures.
PY - 2003/10/23
Y1 - 2003/10/23
N2 - The life cycle of the western flower thrips (WFT), Frankliniella occidentalis Pergande (Thysanoptera: Thripidae), comprises an edaphic phase, which offers the opportunity to control this serious pest by the exploitation of soil-dwelling natural enemies. In the present study, the effect of the two soil-dwelling predatory mites, Hypoaspis miles (Berlese) and H. aculeifer (Canestrini) (Acari: Laelapidae), on the population development of the WFT feeding on French beans (Phaseolus vulgaris) was examined. The experiments were carried out in acrylglass tubes, which served as microcosms. The extent of the edaphic phase within a given population of synchronized WFT was investigated by the use of photo-eclectors (emergence traps). This method ensured (1) an easy determination of the proportion of a thrips population entering the soil for pupation and (2) the quantification of the efficiency of predatory mites on the thrips developmental stages in the soil. The results showed that 98% of the thrips population left the bean plant for pupation in the soil. The introduction of five predatory mites caused thrips mortality of at least 44.9%. Doubling the predator density to 10 H. miles increased thrips mortality to 61%. A maximum thrips mortality of 80.5% was attained by the introduction of 20 H. aculeifer. As a result, H. aculeifer showed a greater efficiency as a natural enemy against soil-dwelling developmental stages of the WFT. Both species can be important antagonists of the WFT in protected crops. Opportunities to enhance biocontrol efforts are discussed.
AB - The life cycle of the western flower thrips (WFT), Frankliniella occidentalis Pergande (Thysanoptera: Thripidae), comprises an edaphic phase, which offers the opportunity to control this serious pest by the exploitation of soil-dwelling natural enemies. In the present study, the effect of the two soil-dwelling predatory mites, Hypoaspis miles (Berlese) and H. aculeifer (Canestrini) (Acari: Laelapidae), on the population development of the WFT feeding on French beans (Phaseolus vulgaris) was examined. The experiments were carried out in acrylglass tubes, which served as microcosms. The extent of the edaphic phase within a given population of synchronized WFT was investigated by the use of photo-eclectors (emergence traps). This method ensured (1) an easy determination of the proportion of a thrips population entering the soil for pupation and (2) the quantification of the efficiency of predatory mites on the thrips developmental stages in the soil. The results showed that 98% of the thrips population left the bean plant for pupation in the soil. The introduction of five predatory mites caused thrips mortality of at least 44.9%. Doubling the predator density to 10 H. miles increased thrips mortality to 61%. A maximum thrips mortality of 80.5% was attained by the introduction of 20 H. aculeifer. As a result, H. aculeifer showed a greater efficiency as a natural enemy against soil-dwelling developmental stages of the WFT. Both species can be important antagonists of the WFT in protected crops. Opportunities to enhance biocontrol efforts are discussed.
KW - Acari
KW - Biological control
KW - Edaphic phase
KW - Frankliniella occidentalis
KW - Ground foraging
KW - Hypoaspis aculeifer
KW - Hypoaspis miles
KW - Laelapidae
KW - Microcosm
KW - Phaseolus vulgaris
KW - Predator efficiency
KW - Predatory mite
KW - Thripidae
KW - Thysanoptera
KW - Western flower thrips
UR - http://www.scopus.com/inward/record.url?scp=11144357915&partnerID=8YFLogxK
U2 - 10.1016/j.biocontrol.2003.09.009
DO - 10.1016/j.biocontrol.2003.09.009
M3 - Article
AN - SCOPUS:11144357915
VL - 30
SP - 17
EP - 24
JO - Biological control
JF - Biological control
SN - 1049-9644
IS - 1
ER -