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Eleven domestic guinea pig corpses were employed as models for studying decomposition and insect succession in Benha city, Egypt, from April 2009 to March 2010. Ambient temperature, faunistic succession over time, and the rate of decay in different seasons were all compared. Results indicated that ambient temperature is the chief factor determining the seasonal variations in decay rate. The diversity of insect community increased as the state of decomposition advances. Members of Dermistidae and Forrmicidae were the first coleopteran and hymenopteran colonizers in all seasons. Sarcophaga, Wholfortia and Chrysomya was observed in spring and summer. Meanwhile, species of Wholfortia were absent in winter and Crysomya species were absent in fall. Patterns of insect succession occurred in a predictable sequence that varied across different seasons. The rate of corpse's decomposition was faster in summer and autumn as compared to spring and winter

(100,150,200,250 and 300 Gy) and the combined effect of them and essential oil were tested. Results: Comparing the estimated LC10, LC50, LC90 values of present investigation of mentioned essential oils indicated that essential oils of Origanum majorana is more toxic to G. mellonella than the other essential oil of Cymbopogon proximus, then were selected in combined with the dose of 100 Gy in the shared experience. It also found that the percentage of pupation, emergence and sex ratio decreased with increasing concentration of both extracts -The lack of the number of eggs and the percentage of hatched eggs increase with the increase the radiation

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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 therefore 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.In this work we studied the effects of the Beauvaria bassiana and Metarhizium anisoplia on Bracon brevicornis in the laboratory to evaluate the possibility of application of entomopathogenic fungi and the parasitoid Bracon brevicornis side by side in IPM programs. Metarhizium anisoplia was found No mortality observed at the highest concentration (4g/L) and the lowest tested concentration while the recommended concentration recorded mortality (0.1333±0.0908%) of B. brevicornis adult. While The recommended concentration (2g/L) of B. bassiana induced no mortality among the adult parasitoids while its highest tested concentration (4g/L) and the lowest concentration (1g/L) gave mortality (0.0667±.06667%) and (0.1333±0.0908%) respectively.