Effectiveness of Beauveria bassiana applied alone or incombination with diatomaceous earth as protectants of wheat grains against Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae)

Abeer Abotaleb, Salwa Ahmed, Ragaa Hamed, AbdAlmawgod Asran, Bahira, ELSawaf
2016 Egyptian Academic Journal of Biological Sciences F Toxicology & Pest Control  
The journal of Toxicology and pest control is one of the series issued twice by the Egyptian Academic Journal of Biological Sciences, and is devoted to publication of original papers related to the interaction between insects and their environment. The goal of the journal is to advance the scientific understanding of mechanisms of toxicity. Emphasis will be placed on toxic effects observed at relevant exposures, which have direct impact on safety evaluation and risk assessment. The journal
more » ... fore welcomes papers on biology ranging from molecular and cell biology, biochemistry and physiology to ecology and environment, also systematics, microbiology, toxicology, hydrobiology, radiobiology and biotechnology. www.eajbs.eg.net Provided for non-commercial research and education use. Not for reproduction, distribution or commercial use. Laboratory bioassays were conducted to assess the insecticidal efficacy of the formulated fungi, Beauveria bassiana used alone or in combination with a formulated diatomaceous earth (DE) against adults of Rhyzopertha dominica on wheat grains. Mortality increased with increasing powder concentrations and DE was more effective than B. bassiana. Exposure of R. dominica adults to wheat grains treated with mixtures of B. bassiana and DE resulted in higher mortality values than each powder alone at various concentrations. When eggs were treated with LC 50 of each powder alone a significant decrease in adult emergence was achieved. The LC 95 of the two powders caused complete inhibition of adult emergence. The mixture of the two powders caused complete inhibition in adults emergence except in case of LC 25 mixtures which caused about 80% reduction in progeny production. In most cases, B. bassiana and DE treatments did not affect germination of wheat grains as indicated by germination tests.
doi:10.21608/eajbsf.2016.17134 fatcat:heeynbkppzgaxc66gs5dfi7lu4