Efficacy of Entomopathogenic Fungi Paecilomyces spp. against Rice Stem Borer (Scirpophaga incertulas L.) and Leaf Folder (Cnaphalocrocis medinalis L.) under Natural Field condition

Author: Hemlata Rajwade, Pojal Verma, Vinod Kumar Nirmalkar and R.K.S. Tiwari

Download PDF

Abstract

Entomopathogenic fungi are considered the most versatile groups of bioagents which reduce the insect’s population as well as safe guard to environments by considering these facts the EPF was isolated from soils and insects. A field experiment was conducted at research farm of BTC College of Agriculture and Research Station, Bilaspur, (C.G.) during Kharif -2021-2022, to test the efficacy of isolates fungi, among them two most effective isolates of Paceliomyces spp. and combination with other bioagents was tested under natural field condition against two rice insects i.e. rice leaf hopper (Cnaphalocrocis medinalis) and rice stem borer (Scirpophaga incertulas) in two different rice var. Rajeshwari and Swarna. Three different spore suspension loads (1×107, 1×108 and 1×109 sporeml) of Paecilomyces spp. and combination with other bioagents i.e. Beauveria bassiana and BT were sprayed @10mll with Standard check chemical insecticides. Standard check chemical insecticide (Novaluron 5.25% + Indoxacarb 4.5% SC) observed most effective among all treatments when use @1.65mll and reduced rice leaf folder population (87.58% & 86.01%) and stem borer reduced 91.42 and 91.04%, While, Paecilomyces isolate 1 with spore load 1×109 was most superior after insecticide and among all EPF for controlling rice insect leaf folder (73% and 66%) and stem borer 81.71%, 82.92%, respectively for Rajeswari and Swarna var.

Keywords

Paecilomyces, leaf folder, stem borer, Scirpophaga incertulas, Cnaphalocrocis medinalis

Conclusion

•Spodoptera spp. was better insect host for isolation of Paecilomyces spp. •25°C was ideal temperature for mycelial growth, average growth and sporulation. •Dextrose, Peptone was ideal media for growth and sporulation of Paecilomyces. •pH 7 was ideal for production of fungus. •Paecilomyces spp. 109 spore loads @10 ml-1 was better alternative option in safer management of rice stem borer and leaf folder.

References

-

How to cite this article

Hemlata Rajwade, Pojal Verma, Vinod Kumar Nirmalkar and R.K.S. Tiwari (2023). Efficacy of Entomopathogenic Fungi Paecilomyces spp. against Rice Stem Borer (Scirpophaga incertulas L.) and Leaf Folder (Cnaphalocrocis medinalis L.) under Natural Field condition. Biological Forum – An International Journal, 15(5): 1168-1174.