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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Record number 43029
Title Potato crop growth as influenced by potato cyst nematodes (Globodera pallida) and abiotic factors
Author(s) Ruijter, F. de
Source Agricultural University. Promotor(en): G.R. Findenegg; A.J. Haverkort. - S.l. : De Ruijter - ISBN 9789054858195 - 121
Department(s) Research Institute for Agrobiology and Soil Fertility
Sub-department of Soil Quality
Publication type Dissertation, externally prepared
Publication year 1998
Keyword(s) solanum tuberosum - aardappelen - plantenplagen - pratylenchus - heteroderidae - tylenchidae - bodem - nematoda - potatoes - plant pests - soil
Categories Potatoes / Diseases, Pests and Disorders of Plants (General)
Abstract <p>The objective of the research described in this thesis was to determine the major mechanisms by which potato cyst nematodes reduce potato crop growth and to explain interactions known to occur with cultivar and abiotic factors. Understanding of these interactions may lead to strategies that potato growers can use to minimise nematode damage.</p><p>The research concentrated on the interaction between nematodes and soil-related factors. Experiments were carried out, mainly under field conditions, in which the effects of varying levels of nematode density, soil compaction, soil pH and phosphorus fertilisation on crop growth of potato cultivars were studied over time. Two methods for studying root growth in the field were compared and special attention was paid to the effects of nematodes on root growth.</p><p>It was found that potato cyst nematodes reduced crop growth at early stages of growth by inducing or aggravating phosphorus deficiency. Compensatory root growth alleviated phosphorus deficiency at later stages of growth. Application of phosphorus fertiliser reduced or prevented nematode-induced phosphorus deficiency, but could not fully prevent nematode damage. Obviously, penetration of nematodes in the roots also impaired crop photosynthesis also through mechanisms other than nutrient deficiency.</p><p>At late stages of growth, nematodes accelerated crop senescence. This was associated with reduced concentrations of nutrients in the foliage, though it seems likely that more mechanisms could be responsible. To resolve this, further study of the senescence of infested crops and options for remedying this is required.</p><p>It was found that tolerance of cultivars to potato cyst nematodes is associated with production of extra roots and large tops, a characteristic of late maturing potato cultivars. The influence of soil parameters on nematode damage was also found to depend on the amount of foliage produced. It is inferred that crops with large tops suffer little yield loss as they are able to maintain ground cover and light interception, even after infestation by potato cyst nematodes.</p><p>It is concluded that farmers can minimise yield loss by choosing tolerant cultivars and by cultural measures. It is suggested that initial nematode-induced phosphorus deficiency can be relieved by fertilisation methods that increase phosphorus in infested plants to adequate levels. Crop senescence may be delayed by increasing nitrogen in infested plants, e.g. by foliar application of a nitrogen fertiliser, but this requires further study.</p>
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