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Occurrence and distribution of entomopathogenic nematodes in the Slovak Republic

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For more content, see Nematologica.

Infective-stage juveniles of entomopathogenic nematodes of the genera Steinernema and Heterorhabditis were recovered by direct extraction from 36% of a total of 111 soil samples collected in various biotopes from different regions of Slovakia. The rate of prevalence was highest in forest soil (58%). On the basis of morphological characters of the infective juveniles eight Steinernema and one Heterorhabditis species were distinguished. Steinernema affine, S. intermedium and S. feltiae were most prevalent (together 74% of all records). The other species of Steinernema encountered were S. kraussei, S. carpocapsae, S. bicornutum, a species of the S. glaseri group and an undescribed species earlier recorded from Germany. In 11 of the 40 soil samples positive for entomopathogenic nematodes mixtures of two to four species were present. Several species showed a distinct habitat preference, e.g., S. affine for arable soil and S. intermedium for woodland and river bank vegetation with trees. A preference for certain soil types was less apparent. Untersuchungen uber Vorkommen und Verbreitung entomopathogener Nematoden in der Slowakischen Republik - Insgesamt 111 Bodenproben, die in unterschiedlichen Biotopen aus verschiedenen Regionen der Slowakei entnommen worden waren, wurden auf entomopathogene Nematoden untersucht. Infektionsjuvenile der Gattungen Steinernema und Heterorhabditis waren uber eine direkte Extraktion der Nematoden aus dem Boden in 36% aller Proben nachweisbar. Der hochste Anteil "positiver" Proben fand sich bei Proben aus Waldern (58%). Anhand morphologischer Merkmale der Infektionsjuvenilen waren acht Steinernema Arten und eine Heterorhabditis-Art differenzierbar. Steinernema affine, S. intermedium und S. feltiae waren die haufigsten Arten (insgesamt 74% aller Nachweise). S. kraussei, S. carpocapsae, S. bicornutum, eine Steinernema-Art der S. glaseri-Gruppe und eine noch unbeschriebene Steinernema-Art (bereits aus Deutschland bekannt) und Heterorhabditis sp. wurden seltener gefunden. In 11 aller 40 "positiven" Proben kamen zwei bis vier Arten nebeneinander vor. Einige der Arten zeigten eine deutliche Bevorzugung bestimmter Biotoptypen, so S. affine von Acker- und Gartenboden und S. intermedium von Waldern und Ufervegetation mit Baumen. Eine Bevorzugung bestimmter Bodenarten war dagegen kaum erkennbar.


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