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- Title
Damage thresholds and population dynamics of Pratylenchus penetrans on carrot ( Daucus carota L. cv. Nerac) at three different seed densities.
- Authors
Teklu, Misghina; Meressa, Beira; Radtke, Esther; Been, Thomas; Hallmann, Johannes
- Abstract
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. Seinhorst's yield loss model; y = m + (1 - m) 0.95 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; $$ Pf=M* Pi/\left( Pi+M/a\right) $$ 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 ( T) were 1.51, 1.88, and 1.37 and those of quality yields ( T) were 0.67, 0.18, and 0.40 P. penetrans (g dry soil) at 2, 4 and 18 seeds pot, 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, 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) at 2, 4, and 18 seeds pot, respectively. Carrot cv. Nerac can be considered a good host for P. penetrans.
- Subjects
PRATYLENCHUS penetrans; CARROTS; DAUCUS; DATA analysis; NEMATODES
- Publication
European Journal of Plant Pathology, 2016, Vol 146, Issue 1, p117
- ISSN
0929-1873
- Publication type
Article
- DOI
10.1007/s10658-016-0898-6