Introduction. Gram negative bacteria have a thin cell wall made of a single layer of peptidoglycan that is enclosed by an outer membrane. Once considered a harmless saprophyte, Serratia marcescens is now recognized as an important opportunistic pathogen combining a propensity for healthcare-associated infection and antimicrobial resistance. Serratia marcescens is a species of Gram-negative rods (Hejazi and Falkiner 1997) that produces substances useful in different branches of industry and medicine (Siva et al. Several strains of Serratia spp [17,18] and specifically, S. marcescens spp have been isolated from scarab larvae but bioassays to evaluate pathogenicity have not been reported. To determine the effects of temperature on the pathogenicity of Serratia marcescens isolate S-JS1 to Spodoptera exigua and Spodoptera litura, the effects of operating temperature and growth temperature on the insecticidal activity of S. marcescens after treatment of 3rd instar larvae with bacteria diet were studied. Various strains of Serratia occupy an eclectic range of habitats: soil, water, plants, insects, and others.. Water. Habitat. Due to the growing resistance of insects to synthetic pesticides, there is an urgent need for new biopreparations.

The evaluation of the virulence of the S. marcescens 363 isolate by injection bioassay towards larvae of Costelytra zealandica showed that 1355 bacteria per larva caused a mortality of 96% after 6 days of injection [ 20 ]. marcescens is the most abundant, comprising approximately half of all strains found. S. marcescens is a gram negative bacterium. Serratia marcescens is a nonsporulating, Gram-negative, actively motile rod which produces a bright red pigment on most laboratory media. Serratia marcescens is a Gram negative bacterium (Enterobacteriaceae) often associated with infection of insects. S. marcescens is motile and … In order to find pathogenic bacteria with the potential to control scarab larvae, several bacterial strains were isolated from the hemocoel of diseased Phyllophaga spp (Coleoptera:Scarabaeidae) larvae collected from cornfields in Mexico. Serratia marcescens is short and rod shaped when viewed under the microscope. Currently, four species of Serratia have been found in sea water: S. marcescens, S. liquefaciens, S. plymuthica, and S. marinorubra.S. It is generally thought to be a saprophyte found in the soil and does not grow easily at 37 C or occur in man or animals naturally. MICROBIOLOGY.




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