National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Entomopathogenic fungi are recognized as important biocontrol agents of insect pests of crops. For a quantum leap in their adoption for pest management, virulent isolates against target pests are requisites. It is also necessary to garner information on their pathogenicity and effective field dose. Single dose assay of all the nine fungal isolates at 108 spores ml-1 against third instar larvae of C. medinalis, showed that B. bassiana (Bb 5) which recorded cent per cent mortality at eight days after treatment was significantly superior to other treatments, and it was followed by B. bassiana (Bb 21), M. anisopliae (Ma 4) and A. flavus (Af-m1) with 90.00, 73.33 and 66.67 per cent mortality, respectively. The lethal concentration of B. bassiana (Bb 5), required to bring fifty per cent mortality at four days after treatment was 1.70 x 108spores ml-1against C. medinalis. The corresponding LC90 values was 3.50 x 108spores ml-1.The LT50 recorded was 5.38 days for B. bassiana (Bb 5), against C. medinalis at a concentration of 108spores ml-1. The entomopathogenic fungus, B. bassiana (Bb 5) is found ideal for rice pest management.
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