in this study, the effects of two metarhizium anisopliae isolates, originally obtained from red palm weevil (rhynchophorus ferrugineus) and a beetle (parandra caspica), on adults of russian wheat aphid diuraphis noxia were studied under laboratory coditions. after a determination of the minimum & maximum concentrations, the adults were treated with conidial concentrations of 1×103 to 1×106 coni...

the western flower thrips frankliniella occidentalis, an important greenhouse pest, has acquired rapid resistance to the chemical pesticides. therefore, biological control is worth consideration as an alternative control method. among the biological control agents, entomopathogenic fungi showed to be quite successful in some occasions. in this study, three iranian isolates of metarhizium anisop...

Global-scale data on the Oligocene to Recent planktic foraminifers and coccoliths from the tropical Pacific and Atlantic Oceans are employed for quantitative testing of alternative models (Red Queen and Stationary Hypotheses) of the relationship between speciation rates, extinction rates, taxonomic diversity, abiotic events, and history of the paleosystem. The results demonstrate that although ...

pathogenicity and genetic variability of 13 fusarium oxysporum isolates collected from sugar beet field of six provinces of iran during 1999- 2008 were evaluated. pathogenic variability of the isolates was determined using a root-dip assay in spore suspension in test tubes for four- week plants. the isolates were classified into strong and weak pathogenic groups. a total of 15 rapd primers were...

to study the population structure of gibberella fujikuroi species complex, the causal agent of rice foot rot, samples were taken from different rice growing regions of guilan province in 2004. among fourty-one isolates recovered from different cultivars; three isolates did not produce microconidial chain. in order to study the sexual fertility and determine the mating type as well as mating pop...