Abstract
In the present study, natural occurrence of major fungal biopesticide Nomuraea rileyi (Farlow) Samson associated with agricultural field soil in an area around TamilNadu, India was studied adapting culture dependentmethod. Agricultural field soil samples were collected from ten different sites. Soil dilution method was used toisolate N. rileyi. A total of 123 isolates of N.rileyi were obtained. Among the 10 sampling sites, Nomurea rileyi was isolated from 4 sites belonging to Hasthampatty (Salem) Rajakoil (Vellore) Vadavali (Coimbatore), Pullarakottai(Viruthunagar), High frequency of fungal occurrence was recorded in vadavali (60%) followed by Pullarakottai(17%), Hasthampatty (13%,) Rajakoil (10%). Non Nomurae rileyi strains belong to Beauveria sp and Metarhiziumsp were also isolated. Fungal occurrance was highly influenced by soil physico-chemical parameters. Effect ofmetallic nanoparticles such as silver, copper and the respective nanoparticles coated with chitosan on the posttreatment persistance of N. rileyi was also studied.Distinct effcet on the growth of N. rileyi was recorded in copper nanoparticles with high concentration.
Highlights
Among the various microsymbions, fungi is the major component of soil
Sites belonging to Hasthampatty (Salem), Rajakoil (Vellore), Vadavali (Coimbatore), Pullarakottai (Virruthagar), High frequency of distribution was recorded in vadavali (60%) followed by Pullarakottai (17%), Hasthampatty (13%) and Rajakoil (10%) (Figure 1)
Soil physico-chemical parameters highly influenced the natural occurrence of Nomurea rileyi
Summary
Fungi (mycorhizal and pathogens) is the major component of soil. Entomopathogenic fungi are distributed in a wide range of habitats including aquatic forest, agricultural, pasture, desert, and urban habitats [3,4,5]. Their ability to regulate insect populations has been studied in tropical and temperate habitats [6,7,8]. It is increasingly recognized that the biodiversity of agro ecosystems delivers significant services, such as biological control of pests, to agricultural production [8]. The toxic effect of metallic nanoparticles on Nomuraea rileyi was discussed
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