Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Soil feedback of exotic savanna grass relates to pathogen absence and mycorrhizal selectivity
Putten, W.H. van der; Kowalchuk, G.A. ; Brinkman, E.P. ; Doodeman, G.T.A. ; Kraaij, R.M. van der; Kamp, A.F.D. ; Menting, F.B.J. ; Veenendaal, E.M. - \ 2007
Ecology 88 (2007)4. - ISSN 0012-9658 - p. 978 - 988.
gradient gel-electrophoresis - enemy release hypothesis - plant invasions - ammophila-arenaria - lehmann lovegrass - community composition - biotic resistance - fungi - herbivores - spread
Enemy release of exotic plants from soil pathogens has been tested by examining plant¿soil feedback effects in repetitive growth cycles. However, positive soil feedback may also be due to enhanced benefit from the local arbuscular mycorrhizal fungi (AMF). Few studies actually have tested pathogen effects, and none of them did so in arid savannas. In the Kalahari savanna in Botswana, we compared the soil feedback of the exotic grass Cenchrus biflorus with that of two dominant native grasses, Eragrostis lehmanniana and Aristida meridionalis. The exotic grass had neutral to positive soil feedback, whereas both native grasses showed neutral to negative feedback effects. Isolation and testing of root-inhabiting fungi of E. lehmanniana yielded two host-specific pathogens that did not influence the exotic C. biflorus or the other native grass, A. meridionalis. None of the grasses was affected by the fungi that were isolated from the roots of the exotic C. biflorus. We isolated and compared the AMF community of the native and exotic grasses by polymerase chain reaction-denaturing gradient gel elecrophoresis (PCR-DGGE), targeting AMF 18S rRNA. We used roots from monospecific field stands and from plants grown in pots with mixtures of soils from the monospecific field stands. Three-quarters of the root samples of the exotic grass had two nearly identical sequences, showing 99% similarity with Glomus versiforme. The two native grasses were also associated with distinct bands, but each of these bands occurred in only a fraction of the root samples. The native grasses contained a higher diversity of AMF bands than the exotic grass. Canonical correspondence analyses of the AMF band patterns revealed almost as much difference between the native and exotic grasses as between the native grasses. In conclusion, our results support the hypothesis that release from soil-borne enemies may facilitate local abundance of exotic plants, and we provide the first evidence that these processes may occur in arid savanna ecosystems. Pathogenicity tests implicated the involvement of soil pathogens in the soil feedback responses, and further studies should reveal the functional consequences of the observed high infection with a low diversity of AMF in the roots of exotic plants
Life-history parameters of Encarsia formosa, Eretmocerus eremicus and E. Mundus, aphelinid parasitoids of Bemisia argentifolii (Hemiptera: Aleyrodidae)
Qiu, Y.T. ; Lenteren, J.C. van; Drost, Y.C. ; Posthuma-Doodeman, J.A.M. - \ 2004
European Journal of Entomology 101 (2004)1. - ISSN 1210-5759 - p. 83 - 94.
poinsettia euphorbia-pulcherrima - biological-control agents - trialeurodes-vaporariorum - tabaci homoptera - laboratory populations - inundative releases - amitus-fuscipennis - host relationship - natural enemies - species complex
Life-history parameters (juvenile development time, adult longevity, host instar preference and rate of parasitism) offour parasitoids of Bemisia argentifolii (two strains of Encarsia formosa (D and B), Eretmocerus eremicus and Eretmocerus mundus) Were Studied in the laboratory. At 15degreesC juvenile development time was the shortest for E. formosa B (48 days), longest for E. eremicits (79.3 days) and intermediate for E. formosa D (62.8 days) and E. mundus (64 days) at 15degreesC. With increase in temperature, development time decreased to around 14 days for all species/strains at 32degreesC. The lower developmental threshold for development was 11.5, 8.1, 13.0 and 11.5degreesC for E. formosa D, E. formosa B, E. eremicus and E. mundus, respectively. E. formosa D and B, and E. mundus all appeared to prefer to parasitize 3(rd) instar nymphs. The presence of hosts shortened adult longevity in most of the parasitoids, with the exception of E. formosa B, which lived longer than other species/strains irrespective of the presence of hosts. At 15degreesC daily parasitism was very low by all parasitoids. The two Encarsia strains had a constant, but low rate of reproduction during adult life, while the two Eretmocerus species had a very high rate of reproduction when one-day old, which then decreased very quickly. Lifetime fecundity, estimated using a non-linear model, indicated that it was higher for the two Encarsia strains than for the Eretmocerus species. Life history parameters reported in the literature for the four parasitoids are reviewed and compared with Our results. Finally, the potential value for the biological control of whiteflies on greenhouse crops of parasitoids having either a high reproductive rate over a short period (Eretmocerus spp.) or a low rate of reproduction over a long period (Encarsia spp.) is discussed.
Life-history and oviposition behaviour of Amitus bennetti, a parasitoid of Bemisia argentifolii
Drost, Y.C. ; Qiu, Y.T. ; Posthuma-Doodeman, C.J.A.M. ; Lenteren, J.C. van - \ 1999
Entomologia Experimentalis et Applicata 90 (1999). - ISSN 0013-8703 - p. 183 - 189.
Aphelinid parasitoids as sustainable biological control agents in greenhouses
Lenteren, J.C. van; Drost, Y.C. ; Roermund, H.J.W. van; Posthuma-Doodeman, C.J.A.M. - \ 1998
In: Növényvédelem (1999) 34 - p. 15 - 34.
Experience with short-range flight tests for quality control of Encarsia formosa
Hatala-Zseller, I. ; Lenteren, J.C. van; Posthuma-Doodeman, C.J.A.M. - \ 1998
In: Proceedings of International Workshop on Biological and integrated pest management in greenhouse pepper, Hodmezovasarhely,Hungary, 10-14 June 1996 / E. Boszormenyi, E. Ceglarska, Zs. Dancshazy, E. Dormanns Simon & Z. Ilovai (eds) - p. 95 - 99.
Aphelinid parasitoids as sustainable biological control agents in greenhouses.
Lenteren, J.C. van; Drost, Y.C. ; Roermund, H.J.W. van; Posthuma-Doodeman, C.J.A.M. - \ 1997
Journal of Applied Entomology 121 (1997). - ISSN 0931-2048 - p. 473 - 485.
Effect of the eggs and empty moulted cuticulae of larvae of Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae) on the behaviour of Encarsia formosa Gahan (Hymenoptera: Aphelinidae).
Imre, S. ; Doodeman, C.J.A.M. ; Roermund, H.J.W. van; Lenteren, J.C. van - \ 1996
In: Abstract volume of 42th Plant Protection Days, Budapest - p. 27 - 28.
Development of criteria for evaluation of natural enemies in biological control: bionomics of different parasitoids of Bemisia argentifolii.
Drost, Y.C. ; Fadl Elmula, A. ; Posthuma-Doodeman, C.J.A.M. ; Lenteren, J.C. van - \ 1996
IOBC/WPRS Bulletin 19 (1996)1. - ISSN 0253-1100 - p. 31 - 34.
Short-range flight test for quality control of Encarsia formosa.
Posthuma-Doodeman, C.J.A.M. ; Lenteren, J.C. van; Sebestyen, I. ; Ilovai, Z. - \ 1996
Proceedings of the Section Experimental and Applied Entomology of the Netherlands Entomological Society 7 (1996). - ISSN 1388-8390 - p. 153 - 158.
Development of selection criteria for natural enemies in biological control: parasitoids of Bemisia argentifolii.
Drost, Y.C. ; Fadl Elmula, A. ; Posthuma-Doodeman, C.J.A.M. ; Lenteren, J.C. van - \ 1996
Proceedings of the Section Experimental and Applied Entomology of the Netherlands Entomological Society 7 (1996). - ISSN 1388-8390 - p. 165 - 170.
Quality control of Encarsia formosa: flight tests.
Lenteren, J.C. van; Posthuma-Doodeman, C.J.A.M. ; Roskam, M. ; Wessels, G. - \ 1996
IOBC/WPRS Bulletin 19 (1996)1. - ISSN 0253-1100 - p. 87 - 90.
Comparison of searching efficiencies of five parasitoid species (Aphelinidae and Platygasteridae) of Bemisia tabaci/argentifolii (Aleyrodidae).
Drost, Y.C. ; Posthuma-Doodeman, C.J.A.M. ; Lenteren, J.C. van - \ 1996
In: Proc. 20th Int. Congr. of Entomology, Firenze, Italy - p. 655 - 655.
Agrarische accountancy, een branche in beweging.
Doodeman, H.P. ; Giesen, G.W.J. - \ 1996
De Accountant 6 (1996). - p. 402 - 404.
Tests of the flight to check the quality of Encarsia formosa populations.
Imre, S. ; Doodeman, C.A.J. ; Lenteren, J.C. van - \ 1995
In: Abstract volume of 41th Plant Protection Days, Budapest - p. 21 - 22.
Tests of the flight to check the quality of Encarsia formosa populations.
Sebestyen, I. ; Doodeman, C.J.A.M. ; Lenteren, J.C. van - \ 1995
In: Proc. 41st Plant Protection Days. Budapest - p. 65 - 65.
Short-range flight test for quality control of Encarsia formosa.
Doodeman, C.J.A.M. ; Sebestyen, I. ; Lenteren, J.C. van - \ 1994
Mededelingen van de Faculteit Landbouwwetenschappen, Rijksuniversiteit Gent 59 (1994). - p. 315 - 323.
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