PhD theses

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    Wageningen PhD theses


    This database contains bibliographic descriptions of all Wageningen University PhD theses from 1920 onwards. It is updated on a daily basis by WUR Library.

    Author abstracts and/or summaries are added to all descriptions. A link to the full text dissertation is added to the bibliographic description. In a few cases, no electronic version is available, mostly because of copyright issues.

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    mail icon WUR Library, 9 july 2012

     

Record number 1785776
Title Solanum sisymbriifolium (Lam.): a trap crop for potato cyst nematodes
show extra info.
Bart H.G. Timmermans
Author(s) Timmermans, B.H.G.
Publisher [S.l. : s.n.]
Publication year 2005
Description 135 p
Description 1 online resource (135 p)
Notes Auteursnaam op omslag: Bart Timmermansshow all notes
Met lit. opg. - Met samenvatting in het Engels en Nederlands
Proefschrift Wageningen
ISBN 9085043255
Tutors Kropff, Prof. Dr. M.J. ; Vos, Dr. Ir. J. ; Stomph, Dr. Ir. T.J.
Graduation date 2005-12-21
Dissertation no. 3874
Author abstract show abstract
Keywords:Solanumsisymbriifolium ,Globoderapallida ,Globoderarostochiensis , germination, light use efficiency, crop growth, crop management, root length density, hatching, trap crop, tolerance,Phytophthorainfestans , resistance.

Potato cyst nematodes (PCN),Globoderapallida (Stone) and G.rostochiensis (Woll.) continue to be a major pest in potato growing areas, in spite of existing control measures. Therefore,Solanumsisymbriifolium (Lam.) was introduced as a trap crop for PCN inWestern Europe. The current study was performed to collect quantitative information on the ecology, agronomy and potential nematode reduction of S.sisymbriifolium crops in The Netherlands.

The emergence rate of S.sisymbriifolium was almost zero at temperatures below 8 °C. The relation between germination and temperature at sub-optimal temperatures is adequately described withexpolinearand quadratic equations. These are relatively simple, and applicable in modelling germination of other plant species grown in conditions near their base temperature. Plantings between May and the end of July led to a crop with full ground cover. Initial growth was slow, but indeterminate and accumulated amounts of above-ground biomass were high (more than 10 tons ha-1dry matter after 100 days). Root length density could be reasonably well assessed from above-ground crop characteristics, and was linked to theoretically possible nematode reductions. In a greenhouse study in containers, nematode population reduction was found to be related to root length density and length of the growth period of the crop. After 150 days of crop growth the PCN population density was reduced with 75% on average; in the soil layer with maximum root length density of 5.8 cm cm-3the PCN population reduction was 86%. A general formula was derived to calculate the time gained to reduce the PCN population density below threshold levels, comparing a scenario with cultivation of one crop of S.sisymbriifolium , followed by non-hosts or fallow, with a scenario with natural decay of the PCN population (non-hosts or fallow throughout). Calculations indicated that 75% reduction of PCN amounts to 4 years time gain to sanitation. S.sisymbriifolium is highly tolerant to PCN, enabling successful growth in PCN infested soil. Furthermore, it is highly resistant against several isolates ofPhytophthorainfestans (Mont.) deBary, with low infection efficiency and lesion growth rates. Therefore, S.sisymbriifolium is an interesting PCN trap crop, deserving further development.
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Keyword(s) solanum sisymbriifolium / globodera pallida / globodera rostochiensis / seed germination / growth analysis / root systems / hatching / disease resistance / phytophthora infestans / netherlands
Categories Biological Control of Pests
Publication type PhD thesis
Language English
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