Effectivenes of infestation B. germanica L. with strains of M. anisopliae originating from different regions of Poland. The tested strains have caused high mortality of the test insect. Especially effective in reduction were strains Browsk and Pruszyn, which even at relatively low spore density caused high mortality of examinated insects.
Praca dotyczy oceny wpływu zakażeń mieszanych Beauveria bassiana i Pae- cilomyces farinosus (szczepy Ł i P) na redukcję liczebności dojrzałych Blattela germanica L. pochodzących z hodowli laboratoryjnej. Grzyby stosowano w określonej kolejności i w różnym czasie od podania owadom pierwszego patogena.
Sensitivity of two species of entomopathogenic fungi: Beauveria bassinana and B. brongniartii and of three species of entomopathogenic nematodes: Steinernema glaseri, S. feltiae and Heterorhabditis megidis to low doses of two insecticides carbosulfan and carbofuran applied to forest soil to control cockchafer’s grubs was studied. Carbosulfan inhibited the growth of both fungi. Carbofuran stimulated the growth of B. brongniartii. Mortality of carbofuran treated nematodes was higher than mortality of those affected by carbosulfan. Both insecticides did not decrease the pathogenicity of fungi and nematodes towards Galleria mellonella L. larvae. The studies pointed to a possibility of using both insecticides in the Integrated Pest Management.
The aim of this study was to determine the effect of different initial doses of the infective juveniles (IJs) (50 IJs, 200 IJs, 1000 IJs) of Heterorhabditis megidis Poinar (Rhabditida: Heterorhabditidae) strain IsM15/09 on recovery, final yields and percent final yields in larvae Galleria mellonella ( L.). Percent recovery was not directly related to initial dose. Final yields also did not change with the initial dose. However, percent yields was highly negatively correlated with initial dose of nematodes and was the highest with the 50 IJs dose. Additional point of the study was to investigate whether the nematodes are able to produce progeny from one hermaphroditic individual. The results showed that the invasive larvae resumed growth and transformed into hermaphroditic individuals that reproduced without cross-fertilisation.
The effect of volatile and non-volatile metabolites produced by bacteria Bacillus subtilis. B. pumilus, Pseudomonas aurantiaca and actinomycetes Streptomyces flavescens, S. griseoviridis on growth of strains of entomopathogenic fungi Paecilomyces farinosus, P. fumosoroseus, Beauveria bassiana was studied in common cultures on artificial media. Fungal strains responded in various ways to non-volatile metabolites of the same species of bacteria or actinomycetes. Fungi of the genus Paecilomyces had as a rule higher competitive abilities than those of the genus Beauveria. Volatile metabolites produced by actinomycetes totally inhibited growth of all studied fungal strains while those produced by bacteria had only a fungistatic effect.