Abstract

Using dilution and tissue block isolation methods, we obtained 105 isolates of Beauveria bassiana and seven isolates of its associated fungus. The filtrate of fermentation fluid of these isolates was tested for nematicidal activities against four targeted nematode species. Results indicate that nine isolates had high nematicidal activities against four targeted nematodes. Studies show that the culture filtrate of different isolates of B. bassiana and its associated fungus had different levels of activities against the same nematode, and the same culture filtrate had selective toxicity against different nematodes.

Key words: Beauveria bassiana, associated fungus, fermentation fluid, nematode, bioactivity