The fodder radish varieties Anaconda, Contra, Defender, Doublet and Terranova, known to have some partial resistance, were compared to the standard variety, Radical, to estimate their relative susceptibility (RS) for both population dynamic parameters of Meloidogyne chitwoodi and to evaluate dependency. This approach must eventually lead to new screening methods for partial resistance tests. Plants were grown under controlled glasshouse conditions. Twelve densities of nematodes in five replications were used. Five plants per 7 l pot were allowed to grow for a period of 11 weeks until their early flowering stage. Few seedlings of all the varieties at and 64 J2 (g dry soil)−1, and all seedlings exposed to the highest density, J2 (g dry soil)−1, died within a week after germination. Replanted seedlings developed into normal plants. Total yield, expressed as total fresh weight, was not affected by M. chitwoodi. A lower percentage of plants with galls was observed on partially resistant varieties as compared with Radical. For Radical, a maximum multiplication rate (a) of 0.38 and a maximum population density (M) of 6.43 J2 (g dry soil)−1 were estimated. Radical proved to be a bad host for M. chitwoodi with all final populations lower than the . The parameter estimates of (M) for Anaconda, Contra, Defender, Doublet and Terranova were 0.011, 0.006, 0.027, 0.020 and 0.009 J2 (g dry soil)−1, respectively. With Radical taken to be 100% susceptible, this resulted in values of 0.17, 0.10, 0.42, 0.32 and 0.14% of these varieties, respectively, reducing high population levels of M. chitwoodi by more than 98%. There was no correlation between the and the values, indicating that scoring the number of galled plants will not provide a suitable measure for partial resistance.
NemaDecide: a decision support system for the management of potato cyst nematodes. In:
Potato in progress: science meets practice. Wageningen, The NetherlandsWageningen Academic Publishers pp.
BeenT.H.KorthalsG.SchomakerC.H.ZijlstraC. (2007). The MeloStop Project: sampling and detection of Meloidogyne chitwoodi and Meloidogyne fallax. Report 138. Wageningen The Netherlands Plant Research International Wageningen University.
Plant infection by root-knot nematode.
Plant Cell Monographs101-5.
CaillaudM.C.DubreuilG.QuentinM.Perfus-BarbeochL.LecomteP.de Almeida EnglerJ.AbadP.RossoM.N.FaveryB. (2008).
Root-knot nematodes manipulate plant cell function during a compatible interaction.
Journal of Plant Physiology165104-113.
KochD.W.GrayF.A.YunL.JonesR.GillJ.R.SchwopeM. (1999). Trap crop radish use in sugar beet-malt barley rotations of the Big Horn Basin. University of Wyoming Cooperative Extension Service Bulletin B-1068.
Trap crops. In:
Encyclopedia of pest management. New York, NY, USAMarcel Dekker pp.
Meloidogyne species: a diverse group of novel and important plant parasites. In:
Root-knot nematodes. Wallingford, UKCAB International pp.
Biology and management of root-knot nematodes on potato in the Pacific Northwest. In:
Advances in potato pest biology and management. St. Paul, MN, USAAPS Press pp.
Relation between population density of potato cyst nematode and measured degrees of susceptibility (resistance) of resistant potato cultivars and between this density and cyst content in the new generation.
SeinhorstJ.W. (1988). The estimation of densities of nematode populations in soil and plants. Växtskyddsrapporter Jordbruk 51. Uppsala Sweden Research Information Centre of the Swedish University of Agricultural Sciences.
The effect of delay of attack of oats by Heterodera avenae on the relation between initial nematode density and plant growth, plant weight, water consumption and dry matter content.
Comparison of multiplication rates of three pathotypes of potato cyst nematodes on various susceptible and resistant potato cultivars.
Mededelingen van de Landbouwhogeschool en de Opzoekingsstations van de Staat te Gent49605-611.
Relative susceptibilities of eleven potato cultivars and breeders’ clones to Globodera pallida pathotype Pa3, with a discussion of the interpretation of data from pot experiments.
European Journal of Plant Pathology101457-465.
VisserJ.H.M.van den BergW.KorthalsG.W. (2008).
Ring test to evaluate four methods of resistance testing in fodder radish against Meloidogyne chitwoodi. Lelystad, The NetherlandsApplied Plant Research Unit for Arable Farming and Field Production Vegetables.
ZoonF.C.PoleijL.M.SchlathölterM. (2003). Interaction between Raphanus populations and isolates of Meloidogyne chitwoodi and M. fallax. Quarantine root-knot nematodes in Europe. Awareness Resistance Management and Phytosanitary Policy Workshop 9-10 October 2003 Wageningen The Netherlands 25. [Abstr.]