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 499094
Title Damage thresholds and population dynamics of Pratylenchus penetrans on carrot (Daucus carota L. cv. Nerac) at three different seed densities
Author(s) Teklu, Misghina G.; Meressa, B.H.; Radtke, Esther; Been, T.H.; Hallmann, Johannes
Source European Journal of Plant Pathology 146 (2016)1. - ISSN 0929-1873 - p. 117 - 127.
Department(s) Laboratory of Nematology
PPO/PRI AGRO Toegepaste Plantenecologie
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Lesion nematodes - Modelling - Population density - Quality loss - Tolerance limit and yield loss

Yield and quality loss of carrot (Daucus carota L. cv. Nerac) caused by Pratylenchus penetrans and the population dynamics of this nematode were studied in a climate controlled glasshouse. A range of 12 nematode densities was used at three different seed densities of carrot; 2, 4 and 18 seeds pot−1. Seinhorst’s yield loss model; y = m + (1 - m) 0.95Pi/T-1 for Pi > T; y = 1 for Pi ≤ T for Tylenchina was fitted to the yield and quality loss data. Seinhorst’s model for population dynamics of migratory nematodes with multiple generations; (Formula presented.) was fitted to the data of the final population densities (Pf). P. penetrans had a significant impact on carrot taproot yield and its quality. The tolerance limits for the relative carrot taproot yield (Ty) were 1.51, 1.88, and 1.37 and those of quality yields (Tq) were 0.67, 0.18, and 0.40 P. penetrans (g dry soil)−1 at 2, 4 and 18 seeds pot−1, respectively. Both the minimum yield (0.20, 0.29, and 0.60) and the minimum quality yield (0.05, 0.07, and 0.20), expressed as a proportion, increased with seed density at 2, 4 and 18 seeds pot−1, respectively. The model for population dynamics fitted well to the Pf data obtained. The maximum multiplication rates (a) were 19.58, 9.99, and 17.54, while the maximum population densities (M) were 49.86, 43.21, and 60.37 P. penetrans (g dry soil)−1 at 2, 4, and 18 seeds pot−1, respectively. Carrot cv. Nerac can be considered a good host for P. penetrans.

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