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Seasonal population dynamics of inoculated and indigenous steinernematid nematodes in an organic cropping system

Nielsen, Otto and Philipsen, Holger (2004) Seasonal population dynamics of inoculated and indigenous steinernematid nematodes in an organic cropping system. Nematology, 6 (6), pp. 901-909.

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Summary

This study was based on naturally occurring and inoculated populations of steinernematid nematodes. The nematode populations were monitored spring and autumn in two following years in an organic cropping system and changes in population size were related to the presence of potential insect hosts. Nematode population were estimated in terms of nematode incidence (percentage of positive soil samples) by using Tenebrio molitor larvae as bait. The population of naturally occurring nematodes (Steinernema affine (Bovien) and S. feltiae (Filipjev)) was generally at a low level (0-17 % incidence for S. affine and 0-18 % incidence for S. feltiae). Inoculated S. feltiae established well in half of the plots where inoculation had been performed and reached incidences of 87 %. Establishment of inoculated nematodes, and population dynamics in general, was clearly influenced by the presence of insect hosts. In crops with high densities of potential hosts (Sitona lineatus in pea and partly Delia radicum in cabbage), nematode incidence increased from spring to autumn whereas nematode incidence remained unchanged or decreased when few hosts were present (in barley, carrots, alfalfa and leek).


EPrint Type:Journal paper
Keywords:Delia radicum, entomopathogenic nematodes, population dynamics, Psila rosea, Sitona lineatus, Steinernema affine, S. feltiae
Subjects: Soil > Soil quality > Soil biology
Research affiliation: Denmark > DARCOF II (2000-2005) > I.10 (VegCatch) Organic vegetable cultivation methods and use of catch crops
Deposited By: Nielsen, Otto
ID Code:3881
Deposited On:22 Oct 2004
Last Modified:12 Apr 2010 07:30
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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