Population structure of free-living and plant-parasitic nematodes in strawberry plantations under organic farming conditions

摘要

Organic production of strawberry [Fragaria x ananassa Duch.J is increa* world-wide, but knowledge about the influence of cultural practices on the benefi and harmful fauna is empirical rather than field-based. Some species of pi; parasitic nematodes,which are closely related to the host plants, damage strawbe plants. They can occur in populations with joint free-living soil nematodes. ' purpose of this work was to study the soil nematode communities and to determ the ratio between free-living soil and plant-parasitic nematodes in organic strawbe production systems. The investigation of the nematode populations was carried ou the region of the Balkan Mountain Range, village Sredogriv during the vegetat period on the area of 10 ha, with cultivar 'Senga Sengana'. The following genera plant-parasitic nematodes were identified: Pratylenchus, Tylenchorhynch Hoplolaimus, Helicotylenchus. In free-living genera, the fungivore nematoi Aphelenchoides, Filenchus and Aphelenchus were dominated, followed by bacteriovore genera Rhabditis and Cephalobus. The established indicators of nematode communities (maturity index and plant parasite index) can be used bioindicators for the health status of the plantation.